Adding policy-model, model-api & engine-model

Change-Id: I56702b8f0953457d493f894d155b2a6ddc87b10c
Issue-ID: POLICY-856
Signed-off-by: waqas.ikram <waqas.ikram@ericsson.com>

11 files changed, 1836 insertions, 0 deletions

diff --git a/model/engine-model/pom.xml b/model/engine-model/pom.xml
new file mode 100644
index 000000000..347a78de2
--- /dev/null
+++ b/model/engine-model/pom.xml
@@ -0,0 +1,66 @@
+<!--
+  ============LICENSE_START=======================================================
+   Copyright (C) 2018 Ericsson. All rights reserved.
+  ================================================================================
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+  SPDX-License-Identifier: Apache-2.0
+  ============LICENSE_END=========================================================
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.onap.policy.apex-pdp.model</groupId>
+        <artifactId>model</artifactId>
+        <version>2.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>engine-model</artifactId>
+    <name>${project.artifactId}</name>
+    <description>Engine Models used in Apex</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.onap.policy.apex-pdp.model</groupId>
+            <artifactId>policy-model</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>exec-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>generate-xml-schema</id>
+                        <phase>process-classes</phase>
+                        <goals>
+                            <goal>java</goal>
+                        </goals>
+                        <configuration>
+                            <mainClass>org.onap.policy.apex.model.basicmodel.handling.ApexSchemaGenerator</mainClass>
+                            <classpathScope>compile</classpathScope>
+                            <arguments>
+                                <argument>org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel</argument>
+                                <argument>${project.build.directory}/model/xml/apex-engine-model.xsd</argument>
+                            </arguments>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file
diff --git a/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineModel.java b/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineModel.java
new file mode 100644
index 000000000..b7733c6a3
--- /dev/null
+++ b/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineModel.java
@@ -0,0 +1,395 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.model.enginemodel.concepts;
+
+import java.text.SimpleDateFormat;
+import java.util.List;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Enumerated;
+import javax.persistence.JoinColumn;
+import javax.persistence.JoinColumns;
+import javax.persistence.Table;
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxConcept;
+import org.onap.policy.apex.model.basicmodel.concepts.AxKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation;
+import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationMessage;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult.ValidationResult;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbums;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextModel;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchemas;
+import org.onap.policy.apex.model.utilities.Assertions;
+
+/**
+ * A container class for an Apex engine model. This class is a container class that allows an Apex
+ * model to be constructed that contains the current context {@link AxContextModel}, current state
+ * {@link AxEngineState} and current statistics {@link AxEngineStats} of an Apex engine. This model
+ * is used by an Apex engine to pass its current execution state to any system that wishes to query
+ * that information. The time stamp of the engine model is the time at which the state and
+ * statistics of the engine were read.
+ * <p>
+ * Validation checks that the current state {@link AxEngineState} is defined and that the time stamp
+ * is set on the engine model.
+ */
+@Entity
+@Table(name = "AxEngineModel")
+@XmlRootElement(name = "apexEngineModel", namespace = "http://www.onap.org/policy/apex-pdp")
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "AxEngineModel", namespace = "http://www.onap.org/policy/apex-pdp",
+        propOrder = {"timestamp", "state", "stats"})
+
+public class AxEngineModel extends AxContextModel {
+    private static final long serialVersionUID = 6381235864606564046L;
+    private static final int HASH_CODE_PRIME = 32;
+
+    @Column(name = "timestamp")
+    private long timestamp;
+
+    @Enumerated
+    @Column(name = "state")
+    @XmlElement(required = true)
+    private AxEngineState state;
+
+    // @formatter:off
+    @JoinColumns({
+            @JoinColumn(name = "statsParentKeyName", referencedColumnName = "parentKeyName", updatable = false,
+                    insertable = false),
+            @JoinColumn(name = "statsParentKeyVersion", referencedColumnName = "parentKeyVersion", updatable = false,
+                    insertable = false),
+            @JoinColumn(name = "statsParentLocalName ", referencedColumnName = "parentLocalName", updatable = false,
+                    insertable = false),
+            @JoinColumn(name = "statsLocalName", referencedColumnName = "localName", updatable = false,
+                    insertable = false)})
+    private AxEngineStats stats;
+    // @formatter:on
+
+    /**
+     * The Default Constructor creates an engine model with a null key and all its fields undefined.
+     */
+    public AxEngineModel() {
+        this(new AxArtifactKey());
+        timestamp = -1;
+    }
+
+    /**
+     * Copy constructor
+     * 
+     * @param copyConcept the concept to copy from
+     */
+    public AxEngineModel(final AxEngineModel copyConcept) {
+        super(copyConcept);
+    }
+
+    /**
+     * The Keyed Constructor creates an engine model with the given key and all its fields
+     * undefined.
+     *
+     * @param key the engine model key
+     */
+    public AxEngineModel(final AxArtifactKey key) {
+        this(key, new AxContextSchemas(new AxArtifactKey(key.getName() + "_DataTypes", key.getVersion())),
+                new AxKeyInformation(new AxArtifactKey(key.getName() + "_KeyInfo", key.getVersion())),
+                new AxContextAlbums(new AxArtifactKey(key.getName() + "_Context", key.getVersion())));
+    }
+
+    /**
+     * This Constructor creates an engine model with its context model data types all defined, the
+     * state of the engine model is undefined.
+     *
+     * @param key the engine model key
+     * @param contextSchemas the context schemas used by the engine model
+     * @param keyInformation the key information used by the engine model
+     * @param contextAlbums the context albums used by the engine model
+     */
+    public AxEngineModel(final AxArtifactKey key, final AxContextSchemas contextSchemas,
+            final AxKeyInformation keyInformation, final AxContextAlbums contextAlbums) {
+        this(key, contextSchemas, keyInformation, contextAlbums, AxEngineState.UNDEFINED,
+                new AxEngineStats(new AxReferenceKey(key, "_EngineStats", key.getVersion())));
+    }
+
+    /**
+     * This Constructor creates an engine model with all its fields defined.
+     *
+     * @param key the engine model key
+     * @param contextSchemas the context schemas used by the engine model
+     * @param keyInformation the key information used by the engine model
+     * @param contextAlbums the context albums used by the engine model
+     * @param state the state of the engine in the engine model
+     * @param stats the statistics of the engine in the engine model
+     */
+    public AxEngineModel(final AxArtifactKey key, final AxContextSchemas contextSchemas,
+            final AxKeyInformation keyInformation, final AxContextAlbums contextAlbums, final AxEngineState state,
+            final AxEngineStats stats) {
+        super(key, contextSchemas, contextAlbums, keyInformation);
+        Assertions.argumentNotNull(state, "state may not be null");
+        Assertions.argumentNotNull(stats, "stats may not be null");
+
+        this.state = state;
+        this.stats = stats;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.contextmodel.concepts.AxContextModel#getKeys()
+     */
+    @Override
+    public List<AxKey> getKeys() {
+        final List<AxKey> keyList = super.getKeys();
+        keyList.addAll(stats.getKeys());
+        return keyList;
+    }
+
+    /**
+     * Gets the time stamp at which the engine model measurements were taken.
+     *
+     * @return the time stamp at which the engine model measurements were taken
+     */
+    public long getTimestamp() {
+        return timestamp;
+    }
+
+    /**
+     * Gets the time stamp at which the engine model measurements were taken as a string.
+     *
+     * @return the time stamp string
+     */
+    public String getTimeStampString() {
+        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(timestamp);
+    }
+
+    /**
+     * Sets the time stamp at which the engine model measurements were taken.
+     *
+     * @param timestamp the time stamp at which the engine model measurements were taken
+     */
+    public void setTimestamp(final long timestamp) {
+        this.timestamp = timestamp;
+    }
+
+    /**
+     * Gets the state of the engine at the time the measurements were taken.
+     *
+     * @return the state of the engine at the time the measurements were taken
+     */
+    public AxEngineState getState() {
+        return state;
+    }
+
+    /**
+     * Sets the state of the engine.
+     *
+     * @param state the state of the engine
+     */
+    public void setState(final AxEngineState state) {
+        Assertions.argumentNotNull(state, "state may not be null");
+        this.state = state;
+    }
+
+    /**
+     * Gets the statistics of the engine at the time the measurements were taken.
+     *
+     * @return the statistics of the engine at the time the measurements were taken
+     */
+    public AxEngineStats getStats() {
+        return stats;
+    }
+
+    /**
+     * Sets the the statistics of the engine.
+     *
+     * @param stats the the statistics of the engine
+     */
+    public void setStats(final AxEngineStats stats) {
+        Assertions.argumentNotNull(stats, "stats may not be null");
+        this.stats = stats;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see
+     * org.onap.policy.apex.model.contextmodel.concepts.AxContextModel#validate(org.onap.policy.apex
+     * .model .basicmodel.concepts.AxValidationResult)
+     */
+    @Override
+    public AxValidationResult validate(final AxValidationResult resultIn) {
+        AxValidationResult result = resultIn;
+
+        result = stats.validate(result);
+
+        if (timestamp == -1) {
+            result.addValidationMessage(new AxValidationMessage(getKey(), this.getClass(), ValidationResult.INVALID,
+                    this.getClass().getSimpleName() + " - timestamp is not set"));
+        }
+
+        if (state == AxEngineState.UNDEFINED) {
+            result.addValidationMessage(new AxValidationMessage(getKey(), this.getClass(), ValidationResult.INVALID,
+                    this.getClass().getSimpleName() + " - state is UNDEFINED"));
+        }
+
+        return result;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.contextmodel.concepts.AxContextModel#clean()
+     */
+    @Override
+    public void clean() {
+        super.clean();
+        stats.clean();
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.contextmodel.concepts.AxContextModel#toString()
+     */
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append(this.getClass().getSimpleName());
+        builder.append(":(");
+        builder.append(super.toString());
+        builder.append(",timestamp=");
+        builder.append(timestamp);
+        builder.append(",state=");
+        builder.append(state);
+        builder.append(",stats=");
+        builder.append(stats);
+        builder.append(")");
+        return builder.toString();
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see
+     * org.onap.policy.apex.model.basicmodel.concepts.AxConcept#copyTo(org.onap.policy.apex.model.
+     * basicmodel.concepts.AxConcept)
+     */
+    @Override
+    public AxConcept copyTo(final AxConcept targetObject) {
+        Assertions.argumentNotNull(targetObject, "target may not be null");
+
+        final Object copyObject = targetObject;
+        Assertions.instanceOf(copyObject, AxEngineModel.class);
+
+        final AxEngineModel copy = ((AxEngineModel) copyObject);
+        super.copyTo(targetObject);
+        copy.timestamp = timestamp;
+        copy.setState(state);
+        copy.setStats(new AxEngineStats(stats));
+
+        return copy;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.contextmodel.concepts.AxContextModel#hashCode()
+     */
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + super.hashCode();
+        result = prime * result + (int) (timestamp ^ (timestamp >>> HASH_CODE_PRIME));
+        result = prime * result + state.hashCode();
+        result = prime * result + stats.hashCode();
+        return result;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.contextmodel.concepts.AxContextModel#equals(java.lang.Object)
+     */
+    @Override
+    public boolean equals(final Object obj) {
+        if (obj == null) {
+            throw new IllegalArgumentException("comparison object may not be null");
+        }
+
+        if (this == obj) {
+            return true;
+        }
+
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+
+        final AxEngineModel other = (AxEngineModel) obj;
+        if (!super.equals(other)) {
+            return false;
+        }
+        if (timestamp != other.timestamp) {
+            return false;
+        }
+        if (!state.equals(other.state)) {
+            return false;
+        }
+        return stats.equals(other.stats);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see
+     * org.onap.policy.apex.model.contextmodel.concepts.AxContextModel#compareTo(org.onap.policy.
+     * apex.model.basicmodel.concepts.AxConcept)
+     */
+    @Override
+    public int compareTo(final AxConcept otherObj) {
+        Assertions.argumentNotNull(otherObj, "comparison object may not be null");
+
+        if (this == otherObj) {
+            return 0;
+        }
+        if (getClass() != otherObj.getClass()) {
+            return this.hashCode() - otherObj.hashCode();
+        }
+
+        final AxEngineModel other = (AxEngineModel) otherObj;
+        if (!super.equals(other)) {
+            return super.compareTo(other);
+        }
+        if (timestamp != other.timestamp) {
+            return (int) (timestamp - other.timestamp);
+        }
+        if (!state.equals(other.state)) {
+            return state.compareTo(other.state);
+        }
+        return stats.compareTo(other.stats);
+    }
+}
diff --git a/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineState.java b/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineState.java
new file mode 100644
index 000000000..f77fe1910
--- /dev/null
+++ b/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineState.java
@@ -0,0 +1,46 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.model.enginemodel.concepts;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlType;
+
+/**
+ * This enumeration indicates the execution state of an Apex engine.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "AxEngineState", namespace = "http://www.onap.org/policy/apex-pdp")
+public enum AxEngineState {
+    /** The state of the engine is not known. */
+    UNDEFINED,
+    /** The engine is stopped. */
+    STOPPED,
+    /** The engine is running and is waiting to execute a policy. */
+    READY,
+    /** The engine is running and is executing a policy. */
+    EXECUTING,
+    /** The engine has been ordered to stop and is stoping. */
+    STOPPING;
+}
diff --git a/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineStats.java b/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineStats.java
new file mode 100644
index 000000000..b7593e751
--- /dev/null
+++ b/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/AxEngineStats.java
@@ -0,0 +1,545 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.model.enginemodel.concepts;
+
+import java.text.SimpleDateFormat;
+import java.util.List;
+
+import javax.persistence.Column;
+import javax.persistence.EmbeddedId;
+import javax.persistence.Entity;
+import javax.persistence.Table;
+import javax.persistence.Transient;
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxConcept;
+import org.onap.policy.apex.model.basicmodel.concepts.AxKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationMessage;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult.ValidationResult;
+import org.onap.policy.apex.model.utilities.Assertions;
+
+/**
+ * This class is a java bean that is used to record statistics on Apex engines as they execute.
+ * Statistics on the number of events, the amount of time taken to execute the last policy, the
+ * average policy execution time, the up time of the engine, and the time stamp of the last engine
+ * start are recorded.
+ */
+
+@Entity
+@Table(name = "AxEngineStats")
+
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlRootElement(name = "apexEngineStats", namespace = "http://www.onap.org/policy/apex-pdp")
+@XmlType(name = "AxEngineStats", namespace = "http://www.onap.org/policy/apex-pdp", propOrder = {"key", "timeStamp",
+        "eventCount", "lastExecutionTime", "averageExecutionTime", "upTime", "lastStart"})
+public class AxEngineStats extends AxConcept {
+    private static final long serialVersionUID = -6981129081962785368L;
+    private static final int HASH_CODE_PRIME = 32;
+
+    @EmbeddedId
+    @XmlElement(name = "key", required = true)
+    private AxReferenceKey key;
+
+    @Column
+    @XmlElement(required = true)
+    private long timeStamp;
+
+    @Column
+    @XmlElement(required = true)
+    private long eventCount;
+
+    @Column
+    @XmlElement(required = true)
+    private long lastExecutionTime;
+
+    @Column
+    @XmlElement(required = true)
+    private double averageExecutionTime;
+
+    @Column
+    @XmlElement(required = true)
+    private long upTime;
+
+    @Transient
+    private transient long lastEnterTime;
+
+    @Column
+    @XmlElement(required = true)
+    private long lastStart;
+
+    /**
+     * The Default Constructor creates an engine statistics instance with a null key and with all
+     * values cleared.
+     */
+    public AxEngineStats() {
+        this(new AxReferenceKey());
+        timeStamp = 0;
+        eventCount = 0;
+        lastExecutionTime = 0;
+        averageExecutionTime = 0;
+        upTime = 0;
+        lastEnterTime = 0;
+        lastStart = 0;
+    }
+
+    /**
+     * Copy constructor
+     * 
+     * @param copyConcept the concept to copy from
+     */
+    public AxEngineStats(final AxEngineStats copyConcept) {
+        super(copyConcept);
+    }
+
+    /**
+     * The Keyed Constructor creates an engine statistics instance with the given key and all values
+     * cleared.
+     *
+     * @param key the key
+     */
+    public AxEngineStats(final AxReferenceKey key) {
+        this(key, 0, 0, 0, 0, 0, 0);
+    }
+
+    /**
+     * This Constructor creates an engine statistics instance with all its fields set.
+     *
+     * @param key the engine statistics key
+     * @param timeStamp the time stamp at which the statistics were recorded
+     * @param eventCount the number of events processed by the engine
+     * @param lastExecutionTime the amount of time taken to execute the last policy
+     * @param averageExecutionTime the average amount of time taken to execute a policy
+     * @param upTime the time that has elapsed since the policy engine was started
+     * @param lastStart the time at which the policy engine was last started
+     */
+    public AxEngineStats(final AxReferenceKey key, final long timeStamp, final long eventCount,
+            final long lastExecutionTime, final double averageExecutionTime, final long upTime, final long lastStart) {
+        super();
+        Assertions.argumentNotNull(key, "key may not be null");
+
+        this.key = key;
+        this.timeStamp = timeStamp;
+        this.eventCount = eventCount;
+        this.lastExecutionTime = lastExecutionTime;
+        this.averageExecutionTime = averageExecutionTime;
+        this.upTime = upTime;
+        this.lastStart = lastStart;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.basicmodel.concepts.AxConcept#getKey()
+     */
+    @Override
+    public AxReferenceKey getKey() {
+        return key;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.basicmodel.concepts.AxConcept#getKeys()
+     */
+    @Override
+    public List<AxKey> getKeys() {
+        return key.getKeys();
+    }
+
+    /**
+     * Sets the engine statistics key.
+     *
+     * @param key the engine statistics key
+     */
+    public void setKey(final AxReferenceKey key) {
+        Assertions.argumentNotNull(key, "key may not be null");
+        this.key = key;
+    }
+
+    /**
+     * Gets the time stamp at which the statistics were recorded.
+     *
+     * @return the time stamp at which the statistics were recorded
+     */
+    public long getTimeStamp() {
+        return timeStamp;
+    }
+
+    /**
+     * Gets the time stamp at which the statistics were recorded as a string.
+     *
+     * @return the time stamp at which the statistics were recorded as a string
+     */
+    public String getTimeStampString() {
+        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(timeStamp);
+    }
+
+    /**
+     * Sets the time stamp at which the statistics were recorded.
+     *
+     * @param timeStamp the time stamp at which the statistics were recorded
+     */
+    public void setTimeStamp(final long timeStamp) {
+        this.timeStamp = timeStamp;
+    }
+
+    /**
+     * Gets the number of events processed by the engine.
+     *
+     * @return the number of events processed by the engine
+     */
+    public long getEventCount() {
+        return eventCount;
+    }
+
+    /**
+     * Sets the number of events processed by the engine.
+     *
+     * @param eventCount the number of events processed by the engine
+     */
+    public void setEventCount(final long eventCount) {
+        this.eventCount = eventCount;
+    }
+
+    /**
+     * Gets the amount of time taken to execute the last policy.
+     *
+     * @return the amount of time taken to execute the last policy
+     */
+    public long getLastExecutionTime() {
+        return lastExecutionTime;
+    }
+
+    /**
+     * Sets the amount of time taken to execute the last policy.
+     *
+     * @param lastExecutionTime the amount of time taken to execute the last policy
+     */
+    public void setLastExecutionTime(final long lastExecutionTime) {
+        this.lastExecutionTime = lastExecutionTime;
+    }
+
+    /**
+     * Gets the average amount of time taken to execute a policy.
+     *
+     * @return the average amount of time taken to execute a policy
+     */
+    public double getAverageExecutionTime() {
+        return averageExecutionTime;
+    }
+
+    /**
+     * Sets the average amount of time taken to execute a policy.
+     *
+     * @param averageExecutionTime the average amount of time taken to execute a policy
+     */
+    public void setAverageExecutionTime(final double averageExecutionTime) {
+        this.averageExecutionTime = averageExecutionTime;
+    }
+
+    /**
+     * Gets the time that has elapsed since the policy engine was started.
+     *
+     * @return the time that has elapsed since the policy engine was started
+     */
+    public long getUpTime() {
+        if (this.getLastStart() != 0) {
+            return upTime + (timeStamp - this.getLastStart());
+        }
+        return upTime;
+    }
+
+    /**
+     * Sets the time that has elapsed since the policy engine was started.
+     *
+     * @param upTime the time that has elapsed since the policy engine was started
+     */
+    public void setUpTime(final long upTime) {
+        this.upTime = upTime;
+    }
+
+    /**
+     * Sets the time at which the policy engine was last started.
+     *
+     * @param lastStart the time at which the policy engine was last started
+     */
+    private void setLastStart(final long lastStart) {
+        this.lastStart = lastStart;
+    }
+
+    /**
+     * Gets the time at which the policy engine was last started.
+     *
+     * @return the time at which the policy engine was last started
+     */
+    private long getLastStart() {
+        return lastStart;
+    }
+
+    /**
+     * Resets all the statistic values to zero.
+     */
+    public synchronized void reset() {
+        timeStamp = 0;
+        eventCount = 0;
+        lastExecutionTime = 0;
+        averageExecutionTime = 0;
+        upTime = 0;
+        lastEnterTime = 0;
+        lastStart = 0;
+    }
+
+    /**
+     * Updates the statistics when called, used by the Apex engine when it starts executing a
+     * policy.
+     *
+     * @param eventkey the key of the event that is being executed
+     */
+    public synchronized void executionEnter(final AxArtifactKey eventkey) {
+        final long now = System.currentTimeMillis();
+        eventCount++;
+        if (eventCount < 0) {
+            eventCount = 2;
+        }
+        lastEnterTime = now;
+        timeStamp = now;
+    }
+
+    /**
+     * Updates the statistics when called, used by the Apex engine when it completes executing a
+     * policy.
+     */
+    public synchronized void executionExit() {
+        final long now = System.currentTimeMillis();
+        lastExecutionTime = now - lastEnterTime;
+
+        averageExecutionTime = ((averageExecutionTime * (eventCount - 1.0)) + lastExecutionTime) / eventCount;
+        lastEnterTime = 0;
+        timeStamp = System.currentTimeMillis();
+    }
+
+    /**
+     * Updates the statistics when called, used by the Apex engine when it is started.
+     */
+    public synchronized void engineStart() {
+        final long now = System.currentTimeMillis();
+        timeStamp = now;
+        this.setLastStart(now);
+    }
+
+    /**
+     * Updates the statistics when called, used by the Apex engine when it is stopped.
+     */
+    public synchronized void engineStop() {
+        final long now = System.currentTimeMillis();
+        timeStamp = now;
+        upTime += (timeStamp - this.getLastStart());
+        this.setLastStart(0);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see
+     * org.onap.policy.apex.model.basicmodel.concepts.AxConcept#validate(org.onap.policy.apex.model.
+     * basicmodel.concepts.AxValidationResult)
+     */
+    @Override
+    public AxValidationResult validate(final AxValidationResult result) {
+        if (key.equals(AxReferenceKey.getNullKey())) {
+            result.addValidationMessage(
+                    new AxValidationMessage(key, this.getClass(), ValidationResult.INVALID, "key is a null key"));
+        }
+
+        return key.validate(result);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.basicmodel.concepts.AxConcept#clean()
+     */
+    @Override
+    public void clean() {
+        key.clean();
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.basicmodel.concepts.AxConcept#toString()
+     */
+    @Override
+    public String toString() {
+        final StringBuilder builder = new StringBuilder();
+        builder.append(this.getClass().getSimpleName());
+        builder.append(":(");
+        builder.append("engineKey=");
+        builder.append(key);
+        builder.append(",timeStamp=");
+        builder.append(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(timeStamp));
+        builder.append(",eventCount=");
+        builder.append(eventCount);
+        builder.append(",lastExecutionTime=");
+        builder.append(lastExecutionTime);
+        builder.append(",averageExecutionTime=");
+        builder.append(averageExecutionTime);
+        builder.append(",upTime=");
+        builder.append(getUpTime());
+        builder.append(")");
+        return builder.toString();
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see
+     * org.onap.policy.apex.model.basicmodel.concepts.AxConcept#copyTo(org.onap.policy.apex.model.
+     * basicmodel.concepts.AxConcept)
+     */
+    @Override
+    public AxConcept copyTo(final AxConcept targetObject) {
+        Assertions.argumentNotNull(targetObject, "target may not be null");
+
+        final Object copyObject = targetObject;
+        Assertions.instanceOf(copyObject, AxEngineStats.class);
+
+        final AxEngineStats copy = ((AxEngineStats) copyObject);
+        copy.setKey(new AxReferenceKey(key));
+        copy.setTimeStamp(timeStamp);
+        copy.setEventCount(eventCount);
+        copy.setLastExecutionTime(lastExecutionTime);
+        copy.setAverageExecutionTime(averageExecutionTime);
+        copy.setUpTime(upTime);
+        copy.setLastStart(lastStart);
+
+        return copy;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.basicmodel.concepts.AxConcept#hashCode()
+     */
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + key.hashCode();
+        result = prime * result + (int) (timeStamp ^ (timeStamp >>> HASH_CODE_PRIME));
+        result = prime * result + (int) (eventCount ^ (eventCount >>> HASH_CODE_PRIME));
+        result = prime * result + (int) (lastExecutionTime ^ (lastExecutionTime >>> HASH_CODE_PRIME));
+        result = prime * result + ((int) averageExecutionTime ^ ((int) averageExecutionTime >>> HASH_CODE_PRIME));
+        result = prime * result + (int) (upTime ^ (upTime >>> HASH_CODE_PRIME));
+        result = prime * result + (int) (getLastStart() ^ (getLastStart() >>> HASH_CODE_PRIME));
+        return result;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.model.basicmodel.concepts.AxConcept#equals(java.lang.Object)
+     */
+    @Override
+    public boolean equals(final Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (this == obj) {
+            return true;
+        }
+
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+
+        final AxEngineStats other = (AxEngineStats) obj;
+        if (!key.equals(other.key)) {
+            return false;
+        }
+        if (timeStamp != other.timeStamp) {
+            return false;
+        }
+        if (eventCount != other.eventCount) {
+            return false;
+        }
+        if (lastExecutionTime != other.lastExecutionTime) {
+            return false;
+        }
+        if (averageExecutionTime != other.averageExecutionTime) {
+            return false;
+        }
+        if (upTime != other.upTime) {
+            return false;
+        }
+        return getLastStart() == other.getLastStart();
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see java.lang.Comparable#compareTo(java.lang.Object)
+     */
+    @Override
+    public int compareTo(final AxConcept otherObj) {
+        if (otherObj == null) {
+            return -1;
+        }
+        if (this == otherObj) {
+            return 0;
+        }
+        if (getClass() != otherObj.getClass()) {
+            return this.hashCode() - otherObj.hashCode();
+        }
+
+        final AxEngineStats other = (AxEngineStats) otherObj;
+        if (!key.equals(other.key)) {
+            return key.compareTo(other.key);
+        }
+        if (timeStamp != other.timeStamp) {
+            return (int) (timeStamp - other.timeStamp);
+        }
+        if (eventCount != other.eventCount) {
+            return (int) (eventCount - other.eventCount);
+        }
+        if (lastExecutionTime != other.lastExecutionTime) {
+            return (int) (lastExecutionTime - other.lastExecutionTime);
+        }
+        if (averageExecutionTime != other.averageExecutionTime) {
+            return (int) (averageExecutionTime - other.averageExecutionTime);
+        }
+        if (upTime != other.upTime) {
+            return (int) (upTime - other.upTime);
+        }
+        if (getLastStart() != other.getLastStart()) {
+            return (int) (getLastStart() - other.getLastStart());
+        }
+
+        return 0;
+    }
+}
diff --git a/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/package-info.java b/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/package-info.java
new file mode 100644
index 000000000..ea47c6993
--- /dev/null
+++ b/model/engine-model/src/main/java/org/onap/policy/apex/model/enginemodel/concepts/package-info.java
@@ -0,0 +1,34 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+/**
+ * Contains the concepts required to receive state information and statistcs from running APEX
+ * engines.
+ * 
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+@XmlSchema(namespace = "http://www.onap.org/policy/apex-pdp", elementFormDefault = XmlNsForm.QUALIFIED,
+        xmlns = {@XmlNs(namespaceURI = "http://www.onap.org/policy/apex-pdp", prefix = "")})
+
+package org.onap.policy.apex.model.enginemodel.concepts;
+
+import javax.xml.bind.annotation.XmlNs;
+import javax.xml.bind.annotation.XmlNsForm;
+import javax.xml.bind.annotation.XmlSchema;
diff --git a/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/TestEngineModel.java b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/TestEngineModel.java
new file mode 100644
index 000000000..86530462c
--- /dev/null
+++ b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/TestEngineModel.java
@@ -0,0 +1,187 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.model.enginemodel.concepts;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import org.junit.Test;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation;
+import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult.ValidationResult;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbums;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchemas;
+
+/**
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class TestEngineModel {
+
+    @Test
+    public void testEnginetModel() {
+        assertNotNull(new AxEngineModel());
+        assertNotNull(new AxEngineModel(new AxArtifactKey()));
+        assertNotNull(new AxEngineModel(new AxArtifactKey(), new AxContextSchemas(), new AxKeyInformation(),
+                new AxContextAlbums()));
+        assertNotNull(new AxEngineModel(new AxArtifactKey(), new AxContextSchemas(), new AxKeyInformation(),
+                new AxContextAlbums(), AxEngineState.UNDEFINED, new AxEngineStats()));
+
+        final AxArtifactKey modelKey = new AxArtifactKey("ModelName", "0.0.1");
+        final AxArtifactKey schemasKey = new AxArtifactKey("SchemasKey", "0.0.1");
+        final AxArtifactKey albumKey = new AxArtifactKey("AlbumKey", "0.0.1");
+        final AxArtifactKey keyInfoKey = new AxArtifactKey("SchemasKey", "0.0.1");
+        final AxEngineStats stats = new AxEngineStats(new AxReferenceKey(modelKey, "EngineStats"));
+        final AxEngineStats otherStats = new AxEngineStats();
+        otherStats.setAverageExecutionTime(100);
+
+        final AxEngineModel model = new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, stats);
+        model.register();
+
+        try {
+            model.setKey(null);
+            fail("test should throw an exception here");
+        } catch (final Exception e) {
+            assertEquals("key may not be null", e.getMessage());
+        }
+
+        model.setKey(modelKey);
+        assertEquals("ModelName:0.0.1", model.getKey().getID());
+        assertEquals("ModelName:0.0.1", model.getKeys().get(0).getID());
+
+        final long timestamp = System.currentTimeMillis();
+        model.setTimestamp(timestamp);
+        assertEquals(timestamp, model.getTimestamp());
+        model.setTimestamp(-1);
+        assertTrue(model.getTimeStampString().matches("\\d{4}-\\d{2}-\\d{2} \\d{2}:\\d{2}:\\d{2}.\\d{3}"));
+
+        try {
+            model.setState(null);
+            fail("test should throw an exception here");
+        } catch (final Exception e) {
+            assertEquals("state may not be null", e.getMessage());
+        }
+
+        for (final AxEngineState state : AxEngineState.values()) {
+            model.setState(state);
+            assertEquals(state, model.getState());
+        }
+
+        model.setState(AxEngineState.READY);
+        assertEquals(AxEngineState.READY, model.getState());
+
+        try {
+            model.setStats(null);
+            fail("test should throw an exception here");
+        } catch (final Exception e) {
+            assertEquals("stats may not be null", e.getMessage());
+        }
+
+        model.setStats(stats);
+        assertEquals(stats, model.getStats());
+
+        model.clean();
+        assertNotNull(model);
+        assertEquals("AxEngineModel:(AxEngineModel:(AxEngineModel:(key=A", model.toString().substring(0, 50));
+
+        final AxEngineModel clonedModel = new AxEngineModel(model);
+
+        assertFalse(model.hashCode() == 0);
+
+        assertTrue(model.equals(model));
+        assertTrue(model.equals(clonedModel));
+        assertFalse(model.equals("Hello"));
+        assertFalse(model.equals(new AxEngineModel(new AxArtifactKey())));
+        assertFalse(model.equals(new AxEngineModel(new AxArtifactKey(), new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+        assertFalse(model.equals(new AxEngineModel(modelKey, new AxContextSchemas(), new AxKeyInformation(keyInfoKey),
+                new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+        assertFalse(model.equals(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey), new AxKeyInformation(),
+                new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+        assertFalse(model.equals(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(), AxEngineState.READY, stats)));
+        assertFalse(model.equals(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.STOPPED, stats)));
+        assertFalse(model.equals(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, otherStats)));
+        model.setTimestamp(timestamp);
+        assertFalse(model.equals(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+        model.setTimestamp(0);
+        assertTrue(model.equals(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+
+        model.setTimestamp(-1);
+        assertEquals(0, model.compareTo(model));
+        assertEquals(0, model.compareTo(clonedModel));
+        assertNotEquals(0, model.compareTo(new AxArtifactKey()));
+        assertFalse(model.equals(new AxEngineModel(new AxArtifactKey())));
+        assertNotEquals(0, model.compareTo(new AxEngineModel(new AxArtifactKey(), new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+        assertNotEquals(0, model.compareTo(new AxEngineModel(modelKey, new AxContextSchemas(),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+        assertNotEquals(0, model.compareTo(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(), new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+        assertNotEquals(0, model.compareTo(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(), AxEngineState.READY, stats)));
+        assertNotEquals(0, model.compareTo(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.STOPPED, stats)));
+        assertNotEquals(0, model.compareTo(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, otherStats)));
+        model.setTimestamp(timestamp);
+        assertNotEquals(0, model.compareTo(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+        model.setTimestamp(0);
+        assertEquals(0, model.compareTo(new AxEngineModel(modelKey, new AxContextSchemas(schemasKey),
+                new AxKeyInformation(keyInfoKey), new AxContextAlbums(albumKey), AxEngineState.READY, stats)));
+
+        model.setTimestamp(timestamp);
+        AxValidationResult result = new AxValidationResult();
+        result = model.validate(result);
+        assertEquals(ValidationResult.VALID, result.getValidationResult());
+
+        model.setTimestamp(-1);
+        result = new AxValidationResult();
+        result = model.validate(result);
+        assertEquals(ValidationResult.INVALID, result.getValidationResult());
+
+        model.setTimestamp(timestamp);
+        result = new AxValidationResult();
+        result = model.validate(result);
+        assertEquals(ValidationResult.VALID, result.getValidationResult());
+
+        model.setState(AxEngineState.UNDEFINED);
+        result = new AxValidationResult();
+        result = model.validate(result);
+        assertEquals(ValidationResult.INVALID, result.getValidationResult());
+
+        model.setState(AxEngineState.READY);
+        result = new AxValidationResult();
+        result = model.validate(result);
+        assertEquals(ValidationResult.VALID, result.getValidationResult());
+    }
+}
diff --git a/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/TestEngineStats.java b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/TestEngineStats.java
new file mode 100644
index 000000000..f5fdcbb1f
--- /dev/null
+++ b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/concepts/TestEngineStats.java
@@ -0,0 +1,193 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.model.enginemodel.concepts;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import org.junit.Test;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult.ValidationResult;
+
+/**
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class TestEngineStats {
+
+    @Test
+    public void testEngineStats() {
+        assertNotNull(new AxEngineStats());
+        assertNotNull(new AxEngineStats(new AxReferenceKey()));
+
+        final AxReferenceKey statsKey = new AxReferenceKey("EngineKey", "0.0.1", "EngineStats");
+        final AxEngineStats stats = new AxEngineStats(statsKey);
+
+        try {
+            stats.setKey(null);
+            fail("test should throw an exception here");
+        } catch (final Exception e) {
+            assertEquals("key may not be null", e.getMessage());
+        }
+
+        stats.setKey(statsKey);
+        assertEquals("EngineKey:0.0.1:NULL:EngineStats", stats.getKey().getID());
+        assertEquals("EngineKey:0.0.1:NULL:EngineStats", stats.getKeys().get(0).getID());
+
+        stats.setAverageExecutionTime(123.45);
+        assertEquals(new Double(123.45), new Double(stats.getAverageExecutionTime()));
+
+        stats.setEventCount(987);
+        assertEquals(987, stats.getEventCount());
+
+        final long lastExecutionTime = System.currentTimeMillis();
+        stats.setLastExecutionTime(lastExecutionTime);
+        assertEquals(lastExecutionTime, stats.getLastExecutionTime());
+
+        final long timestamp = System.currentTimeMillis();
+        stats.setTimeStamp(timestamp);
+        assertEquals(timestamp, stats.getTimeStamp());
+        assertNotNull(stats.getTimeStampString());
+
+        final long upTime = System.currentTimeMillis() - timestamp;
+        stats.setUpTime(upTime);
+        assertEquals(upTime, stats.getUpTime());
+
+        stats.engineStart();
+        assertTrue(stats.getUpTime() > -1);
+        stats.engineStop();
+        assertTrue(stats.getUpTime() >= 0);
+
+        stats.engineStop();
+
+        stats.reset();
+
+        stats.setEventCount(-2);
+        stats.executionEnter(new AxArtifactKey());
+        assertEquals(2, stats.getEventCount());
+
+        stats.setEventCount(10);
+        stats.executionEnter(new AxArtifactKey());
+        assertEquals(11, stats.getEventCount());
+
+        stats.reset();
+        stats.engineStart();
+        stats.setEventCount(4);
+        stats.executionEnter(new AxArtifactKey());
+        try {
+            Thread.sleep(10);
+        } catch (final Exception e) {
+            fail("test should not throw an exeption");
+        }
+        stats.executionExit();
+        final double avExecutionTime = stats.getAverageExecutionTime();
+        System.err.println(avExecutionTime);
+        assertTrue(avExecutionTime >= 2.0 && avExecutionTime < 3.0);
+        stats.engineStop();
+
+        AxValidationResult result = new AxValidationResult();
+        result = stats.validate(result);
+        assertEquals(ValidationResult.VALID, result.getValidationResult());
+
+        stats.setKey(new AxReferenceKey());
+        result = new AxValidationResult();
+        result = stats.validate(result);
+        assertEquals(ValidationResult.INVALID, result.getValidationResult());
+
+        stats.setKey(statsKey);
+        result = new AxValidationResult();
+        result = stats.validate(result);
+        assertEquals(ValidationResult.VALID, result.getValidationResult());
+
+        stats.clean();
+        stats.reset();
+
+        final AxEngineStats clonedStats = new AxEngineStats(stats);
+        assertEquals("AxEngineStats:(engineKey=AxReferenceKey:(parentKey", clonedStats.toString().substring(0, 50));
+
+        assertNotNull(stats.getKeys());
+
+        assertFalse(stats.hashCode() == 0);
+
+        assertTrue(stats.equals(stats));
+        assertTrue(stats.equals(clonedStats));
+        assertFalse(stats.equals(null));
+        assertFalse(stats.equals("Hello"));
+        assertFalse(stats.equals(new AxEngineStats(new AxReferenceKey())));
+
+        assertEquals(0, stats.compareTo(stats));
+        assertEquals(0, stats.compareTo(clonedStats));
+        assertNotEquals(0, stats.compareTo(new AxArtifactKey()));
+        assertNotEquals(0, stats.compareTo(null));
+        assertNotEquals(0, stats.compareTo(new AxEngineStats(new AxReferenceKey())));
+
+        stats.setTimeStamp(1);
+        assertFalse(stats.equals(new AxEngineStats(statsKey)));
+        assertNotEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+        stats.setTimeStamp(0);
+        assertTrue(stats.equals(new AxEngineStats(statsKey)));
+        assertEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+
+        stats.setEventCount(1);
+        assertFalse(stats.equals(new AxEngineStats(statsKey)));
+        assertNotEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+        stats.setEventCount(0);
+        assertTrue(stats.equals(new AxEngineStats(statsKey)));
+        assertEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+
+        stats.setLastExecutionTime(1);
+        assertFalse(stats.equals(new AxEngineStats(statsKey)));
+        assertNotEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+        stats.setLastExecutionTime(0);
+        assertTrue(stats.equals(new AxEngineStats(statsKey)));
+        assertEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+
+        stats.setAverageExecutionTime(1);
+        assertFalse(stats.equals(new AxEngineStats(statsKey)));
+        assertNotEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+        stats.setAverageExecutionTime(0);
+        assertTrue(stats.equals(new AxEngineStats(statsKey)));
+        assertEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+
+        stats.setUpTime(1);
+        assertFalse(stats.equals(new AxEngineStats(statsKey)));
+        assertNotEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+        stats.setUpTime(0);
+        assertTrue(stats.equals(new AxEngineStats(statsKey)));
+        assertEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+
+        stats.engineStart();
+        assertFalse(stats.equals(new AxEngineStats(statsKey)));
+        final AxEngineStats newStats = new AxEngineStats(statsKey);
+        newStats.setTimeStamp(stats.getTimeStamp());
+        assertFalse(stats.equals(newStats));
+        assertNotEquals(0, stats.compareTo(newStats));
+        stats.engineStop();
+        stats.reset();
+        assertTrue(stats.equals(new AxEngineStats(statsKey)));
+        assertEquals(0, stats.compareTo(new AxEngineStats(statsKey)));
+    }
+}
diff --git a/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/handling/TestApexEngineModel.java b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/handling/TestApexEngineModel.java
new file mode 100644
index 000000000..c1e6f3f37
--- /dev/null
+++ b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/handling/TestApexEngineModel.java
@@ -0,0 +1,102 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.model.enginemodel.handling;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.sql.Connection;
+import java.sql.DriverManager;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult;
+import org.onap.policy.apex.model.basicmodel.dao.DAOParameters;
+import org.onap.policy.apex.model.basicmodel.test.TestApexModel;
+import org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel;
+
+public class TestApexEngineModel {
+    private Connection connection;
+    TestApexModel<AxEngineModel> testApexModel;
+
+    @Before
+    public void setup() throws Exception {
+        Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
+        connection = DriverManager.getConnection("jdbc:derby:memory:apex_test;create=true");
+
+        testApexModel = new TestApexModel<AxEngineModel>(AxEngineModel.class, new TestApexEngineModelCreator());
+    }
+
+    @After
+    public void teardown() throws Exception {
+        connection.close();
+        new File("derby.log").delete();
+    }
+
+    @Test
+    public void testModelValid() throws Exception {
+        final AxValidationResult result = testApexModel.testApexModelValid();
+        assertTrue(result.toString().equals(VALID_MODEL_STRING));
+    }
+
+    @Test
+    public void testModelVaidateInvalidModel() throws Exception {
+        final AxValidationResult result = testApexModel.testApexModelVaidateInvalidModel();
+        assertTrue(result.toString().equals(INVALID_MODEL_STRING));
+    }
+
+    @Test
+    public void testModelVaidateMalstructured() throws Exception {
+        final AxValidationResult result = testApexModel.testApexModelVaidateMalstructured();
+        assertTrue(result.toString().equals(INVALID_MODEL_MALSTRUCTURED_STRING));
+    }
+
+    @Test
+    public void testModelWriteReadXML() throws Exception {
+        testApexModel.testApexModelWriteReadXML();
+    }
+
+    @Test
+    public void testModelWriteReadJSON() throws Exception {
+        testApexModel.testApexModelWriteReadJSON();
+    }
+
+    @Test
+    public void testModelWriteReadJPA() throws Exception {
+        final DAOParameters daoParameters = new DAOParameters();
+        daoParameters.setPluginClass("org.onap.policy.apex.model.basicmodel.dao.impl.DefaultApexDao");
+        daoParameters.setPersistenceUnit("DAOTest");
+
+        testApexModel.testApexModelWriteReadJPA(daoParameters);
+    }
+
+    private static final String VALID_MODEL_STRING = "***validation of model successful***";
+
+    private static final String INVALID_MODEL_STRING = "\n" + "***validation of model failed***\n"
+            + "AxArtifactKey:(name=AnEngine,version=0.0.1):org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel:INVALID:AxEngineModel - state is UNDEFINED\n"
+            + "********************************";
+
+    private static final String INVALID_MODEL_MALSTRUCTURED_STRING = "\n" + "***validation of model failed***\n"
+            + "AxArtifactKey:(name=AnEngine,version=0.0.1):org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel:INVALID:AxEngineModel - timestamp is not set\n"
+            + "AxArtifactKey:(name=AnEngine,version=0.0.1):org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel:INVALID:AxEngineModel - state is UNDEFINED\n"
+            + "********************************";
+}
diff --git a/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/handling/TestApexEngineModelCreator.java b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/handling/TestApexEngineModelCreator.java
new file mode 100644
index 000000000..4a4a0cc88
--- /dev/null
+++ b/model/engine-model/src/test/java/org/onap/policy/apex/model/enginemodel/handling/TestApexEngineModelCreator.java
@@ -0,0 +1,127 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.apex.model.enginemodel.handling;
+
+import java.util.UUID;
+
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxKeyInfo;
+import org.onap.policy.apex.model.basicmodel.concepts.AxReferenceKey;
+import org.onap.policy.apex.model.basicmodel.concepts.AxValidationResult;
+import org.onap.policy.apex.model.basicmodel.test.TestApexModelCreator;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbum;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbums;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchemas;
+import org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel;
+import org.onap.policy.apex.model.enginemodel.concepts.AxEngineState;
+import org.onap.policy.apex.model.enginemodel.concepts.AxEngineStats;
+
+public class TestApexEngineModelCreator implements TestApexModelCreator<AxEngineModel> {
+
+    @Override
+    public AxEngineModel getModel() {
+        final AxContextSchema schema0 = new AxContextSchema(new AxArtifactKey("StringType", "0.0.1"), "Java",
+                "org.onap.policy.apex.model.enginemodel.concepts.TestContextItem000");
+        final AxContextSchema schema1 = new AxContextSchema(new AxArtifactKey("MapType", "0.0.1"), "Java",
+                "org.onap.policy.apex.model.enginemodel.concepts.TestContextItem00A");
+
+        final AxContextSchemas schemas = new AxContextSchemas(new AxArtifactKey("ContextSchemas", "0.0.1"));
+        schemas.getSchemasMap().put(schema0.getKey(), schema0);
+        schemas.getSchemasMap().put(schema1.getKey(), schema1);
+
+        final AxContextAlbum album0 =
+                new AxContextAlbum(new AxArtifactKey("contextAlbum0", "0.0.1"), "APPLICATION", true, schema1.getKey());
+
+        final AxContextAlbums albums = new AxContextAlbums(new AxArtifactKey("context", "0.0.1"));
+        albums.getAlbumsMap().put(album0.getKey(), album0);
+
+        final AxEngineModel engineModel = new AxEngineModel(new AxArtifactKey("AnEngine", "0.0.1"));
+        engineModel.setSchemas(schemas);
+        engineModel.setAlbums(albums);
+        engineModel.setTimestamp(System.currentTimeMillis());
+        engineModel.setState(AxEngineState.EXECUTING);
+        engineModel.setStats(new AxEngineStats(new AxReferenceKey(engineModel.getKey(), "EngineStats"),
+                System.currentTimeMillis(), 100, 205, 200, 12345, 9876));
+        engineModel.getKeyInformation().generateKeyInfo(engineModel);
+
+        final AxValidationResult result = new AxValidationResult();
+        engineModel.validate(result);
+
+        return engineModel;
+    }
+
+    @Override
+    public AxEngineModel getInvalidModel() {
+        final AxEngineModel engineModel = getModel();
+
+        engineModel.setTimestamp(System.currentTimeMillis());
+        engineModel.setState(AxEngineState.UNDEFINED);
+        engineModel.setStats(new AxEngineStats(new AxReferenceKey(engineModel.getKey(), "EngineStats"),
+                System.currentTimeMillis(), 100, 205, 200, 12345, 9876));
+        engineModel.getKeyInformation().generateKeyInfo(engineModel);
+
+        return engineModel;
+    }
+
+    public AxEngineModel getMalstructuredModel() {
+        final AxEngineModel engineModel = getModel();
+
+        engineModel.setTimestamp(-1);
+        engineModel.setState(AxEngineState.UNDEFINED);
+
+        return engineModel;
+    }
+
+    @Override
+    public AxEngineModel getObservationModel() {
+        final AxEngineModel engineModel = getModel();
+
+        final AxContextSchema schema0 = new AxContextSchema(new AxArtifactKey("StringType", "0.0.1"), "Java",
+                "org.onap.policy.apex.model.enginemodel.concepts.TestContextItem000");
+        final AxContextSchema schema1 = new AxContextSchema(new AxArtifactKey("MapType", "0.0.1"), "Java",
+                "org.onap.policy.apex.model.enginemodel.concepts.TestContextItem00A");
+
+        engineModel.getKeyInformation().getKeyInfoMap().put(schema0.getKey(),
+                new AxKeyInfo(schema0.getKey(), UUID.fromString("00000000-0000-0000-0000-000000000001"), ""));
+        engineModel.getKeyInformation().getKeyInfoMap().put(schema1.getKey(),
+                new AxKeyInfo(schema1.getKey(), UUID.fromString("00000000-0000-0000-0000-000000000002"), ""));
+
+        return engineModel;
+    }
+
+    @Override
+    public AxEngineModel getWarningModel() {
+        final AxEngineModel engineModel = getModel();
+
+        final AxContextSchema schema0 = new AxContextSchema(new AxArtifactKey("StringType", "0.0.1"), "Java",
+                "org.onap.policy.apex.model.enginemodel.concepts.TestContextItem000");
+        final AxContextSchema schema1 = new AxContextSchema(new AxArtifactKey("MapType", "0.0.1"), "Java",
+                "org.onap.policy.apex.model.enginemodel.concepts.TestContextItem00A");
+
+        engineModel.getKeyInformation().getKeyInfoMap().put(schema0.getKey(),
+                new AxKeyInfo(schema0.getKey(), UUID.fromString("00000000-0000-0000-0000-000000000000"), ""));
+        engineModel.getKeyInformation().getKeyInfoMap().put(schema1.getKey(),
+                new AxKeyInfo(schema1.getKey(), UUID.fromString("00000000-0000-0000-0000-000000000001"), ""));
+
+        return engineModel;
+    }
+}
diff --git a/model/engine-model/src/test/resources/META-INF/persistence.xml b/model/engine-model/src/test/resources/META-INF/persistence.xml
new file mode 100644
index 000000000..717d1a540
--- /dev/null
+++ b/model/engine-model/src/test/resources/META-INF/persistence.xml
@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ============LICENSE_START=======================================================
+   Copyright (C) 2016-2018 Ericsson. All rights reserved.
+  ================================================================================
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+  
+       http://www.apache.org/licenses/LICENSE-2.0
+  
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  
+  SPDX-License-Identifier: Apache-2.0
+  ============LICENSE_END=========================================================
+-->
+
+<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
+    <persistence-unit name="DAOTest" transaction-type="RESOURCE_LOCAL">
+        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
+
+        <class>org.onap.policy.apex.model.basicmodel.dao.converters.CDATAConditioner</class>
+        <class>org.onap.policy.apex.model.basicmodel.dao.converters.UUID2String</class>
+        <class>org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey</class>
+        <class>org.onap.policy.apex.model.basicmodel.concepts.AxConcept</class>
+        <class>org.onap.policy.apex.model.basicmodel.concepts.AxKeyInfo</class>
+        <class>org.onap.policy.apex.model.basicmodel.concepts.AxKeyInformation</class>
+        <class>org.onap.policy.apex.model.basicmodel.concepts.AxModel</class>
+        <class>org.onap.policy.apex.model.basicmodel.concepts.TestEntity</class>
+        <class>org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema</class>
+        <class>org.onap.policy.apex.model.contextmodel.concepts.AxContextSchemas</class>
+        <class>org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbum</class>
+        <class>org.onap.policy.apex.model.contextmodel.concepts.AxContextAlbums</class>
+        <class>org.onap.policy.apex.model.contextmodel.concepts.AxContextModel</class>
+        <class>org.onap.policy.apex.model.eventmodel.concepts.AxField</class>
+        <class>org.onap.policy.apex.model.eventmodel.concepts.AxInputField</class>
+        <class>org.onap.policy.apex.model.eventmodel.concepts.AxOutputField</class>
+        <class>org.onap.policy.apex.model.eventmodel.concepts.AxEvent</class>
+        <class>org.onap.policy.apex.model.eventmodel.concepts.AxEvents</class>
+        <class>org.onap.policy.apex.model.eventmodel.concepts.AxEventModel</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxLogic</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxTaskParameter</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxTaskLogic</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxTask</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxTasks</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxTaskSelectionLogic</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxStateFinalizerLogic</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxStateOutput</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxStateTaskReference</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxState</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxPolicy</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxPolicies</class>
+        <class>org.onap.policy.apex.model.policymodel.concepts.AxPolicyModel</class>
+        <class>org.onap.policy.apex.model.enginemodel.concepts.AxEngineModel</class>
+        <class>org.onap.policy.apex.model.enginemodel.concepts.AxEngineStats</class>
+
+        <properties>
+            <property name="javax.persistence.jdbc.url" value="jdbc:derby:memory:apex_test" />
+            <property name="javax.persistence.target-database" value="Derby" />
+            <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
+
+            <property name="eclipselink.ddl-generation" value="drop-and-create-tables" />
+            <property name="eclipselink.ddl-generation.output-mode" value="database" />
+            <property name="eclipselink.logging.level" value="INFO" />
+        </properties>
+    </persistence-unit>
+</persistence>
diff --git a/model/engine-model/src/test/resources/logback-test.xml b/model/engine-model/src/test/resources/logback-test.xml
new file mode 100644
index 000000000..034511335
--- /dev/null
+++ b/model/engine-model/src/test/resources/logback-test.xml
@@ -0,0 +1,70 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ============LICENSE_START=======================================================
+   Copyright (C) 2016-2018 Ericsson. All rights reserved.
+  ================================================================================
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+  
+       http://www.apache.org/licenses/LICENSE-2.0
+  
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+  
+  SPDX-License-Identifier: Apache-2.0
+  ============LICENSE_END=========================================================
+-->
+
+<configuration>
+
+    <contextName>Apex</contextName>
+    <statusListener class="ch.qos.logback.core.status.OnConsoleStatusListener" />
+    <property name="LOG_DIR" value="${java.io.tmpdir}/apex_logging/" />
+
+	<!-- USE FOR STD OUT ONLY -->
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <Pattern>%d %contextName [%t] %level %logger{36} - %msg%n</Pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+
+    <logger name="org.infinispan" level="INFO" additivity="false">
+        <appender-ref ref="STDOUT" />
+    </logger>
+
+    <logger name="org.apache.zookeeper.ClientCnxn" level="OFF" additivity="false">
+        <appender-ref ref="STDOUT" />
+    </logger>
+
+    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
+        <file>${LOG_DIR}/apex.log</file>
+        <encoder>
+            <pattern>%d %-5relative [procId=${processId}] [%thread] %-5level
+                %logger{26} - %msg %n %ex{full}</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="CTXT_FILE" class="ch.qos.logback.core.FileAppender">
+        <file>${LOG_DIR}/apex_ctxt.log</file>
+        <encoder>
+            <pattern>%d %-5relative [procId=${processId}] [%thread] %-5level
+                %logger{26} - %msg %n %ex{full}</pattern>
+        </encoder>
+    </appender>
+
+    <logger name="org.onap.policy.apex.core.context.impl.monitoring" level="TRACE" additivity="false">
+        <appender-ref ref="CTXT_FILE" />
+    </logger>
+
+    <logger name="org.onap.policy.apex.core.context" level="INFO" additivity="false">
+        <appender-ref ref="STDOUT" />
+    </logger>
+</configuration>