Adding apex core module to apex-pdp

Change-Id: I4bfe1df3e44fe62ff6789e813e59836e267ab3b2
Issue-ID: POLICY-858
Signed-off-by: ramverma <ram.krishna.verma@ericsson.com>

22 files changed, 1570 insertions, 0 deletions

diff --git a/core/core-protocols/pom.xml b/core/core-protocols/pom.xml
new file mode 100644
index 000000000..f308af0c3
--- /dev/null
+++ b/core/core-protocols/pom.xml
@@ -0,0 +1,40 @@
+<!--
+  ============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.core</groupId>
+        <artifactId>core</artifactId>
+        <version>2.0.0-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>core-protocols</artifactId>
+    <name>${project.artifactId}</name>
+    <description>Protocols used to transfer information between components in Apex</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.onap.policy.apex-pdp.model</groupId>
+            <artifactId>basic-model</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+    </dependencies>
+</project>
\ No newline at end of file
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/Action.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/Action.java
new file mode 100644
index 000000000..62a2e0a75
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/Action.java
@@ -0,0 +1,37 @@
+/*-
+ * ============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.core.protocols;
+
+/**
+ * This interface is used to enforce a common type on actions in the Apex messasging protocol. Action types the Apex
+ * messaging protocol supports implement this interface.
+ *
+ * @author Sajeevan Achuthan (sajeevan.achuthan@ericsson.com)
+ */
+public interface Action {
+
+    /**
+     * This method returns a string representation of each action.
+     *
+     * @return the action string
+     */
+    String getActionString();
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/Message.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/Message.java
new file mode 100644
index 000000000..73465cef6
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/Message.java
@@ -0,0 +1,200 @@
+/*-
+ * ============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.core.protocols;
+
+import java.io.Serializable;
+
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class Message is used to pass protocol messages between Apex components.
+ *
+ * @author Sajeevan Achuthan (sajeevan.achuthan@ericsson.com)
+ */
+public abstract class Message implements Serializable {
+    private static final int HASH_PRIME = 31;
+
+    // Serialization ID
+    private static final long serialVersionUID = 2271443377544488309L;
+
+    // Default timeout on server side should be used
+    private static final int DEFAULT_REPLY_TIMEOUT = -1;
+
+    // The Action or message type of the message
+    private Action action = null;
+
+    // The artifact key of the artifact to which this message is related
+    private AxArtifactKey targetKey = null;
+
+    // The data of the message
+    private String messageData = null;
+
+    // The timeout time for replies in milliseconds
+    private int replyTimeout = DEFAULT_REPLY_TIMEOUT;
+
+    /**
+     * Instantiates a new message.
+     *
+     * @param action the action or message type of the message
+     * @param targetKey the artifact key of the artifact to which this message relates
+     */
+    public Message(final Action action, final AxArtifactKey targetKey) {
+        this(action, targetKey, null);
+    }
+
+    /**
+     * Instantiates a new message.
+     *
+     * @param action the action or message type of the message
+     * @param targetKey the artifact key of the artifact to which this message relates
+     * @param messageData the message data to deliver
+     */
+    public Message(final Action action, final AxArtifactKey targetKey, final String messageData) {
+        this.action = action;
+        this.targetKey = targetKey;
+        this.messageData = messageData;
+    }
+
+    /**
+     * Set the message timeout.
+     *
+     * @param replyTimeout the timeout on reply messages in milliseconds
+     */
+    public void setReplyTimeout(final int replyTimeout) {
+        this.replyTimeout = replyTimeout;
+    }
+
+    /**
+     * Sets the message data.
+     *
+     * @param messageData the new message data
+     */
+    public void setMessageData(final String messageData) {
+        this.messageData = messageData;
+    }
+
+    /**
+     * Append to the message data.
+     *
+     * @param newMessageData the message data
+     */
+    public void appendMessageData(final String newMessageData) {
+        if (this.messageData == null) {
+            this.messageData = newMessageData;
+        } else {
+            this.messageData += newMessageData;
+        }
+    }
+
+    /**
+     * Gets the artifact key of the target of the message.
+     *
+     * @return the target
+     */
+    public final AxArtifactKey getTarget() {
+        return targetKey;
+    }
+
+    /**
+     * Gets the artifact key name of the target of the message.
+     *
+     * @return the target name
+     */
+    public final String getTargetName() {
+        return targetKey.getName();
+    }
+
+    /**
+     * Gets the action or message type of this message.
+     *
+     * @return the action
+     */
+    public final Action getAction() {
+        return action;
+    }
+
+    /**
+     * Gets the message data.
+     *
+     * @return the message data
+     */
+    public final String getMessageData() {
+        return messageData;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see java.lang.Object#equals(java.lang.Object)
+     */
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+
+        final Message message = (Message) o;
+
+        if (action != null ? !action.equals(message.action) : message.action != null) {
+            return false;
+        }
+        if (targetKey != null ? !targetKey.equals(message.targetKey) : message.targetKey != null) {
+            return false;
+        }
+        return !(messageData != null ? !messageData.equals(message.messageData) : message.messageData != null);
+
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see java.lang.Object#hashCode()
+     */
+    @Override
+    public int hashCode() {
+        int result = action != null ? action.hashCode() : 0;
+        result = HASH_PRIME * result + (targetKey != null ? targetKey.hashCode() : 0);
+        result = HASH_PRIME * result + (messageData != null ? messageData.hashCode() : 0);
+        return result;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see java.lang.Object#toString()
+     */
+    @Override
+    public String toString() {
+        return "Message [action=" + action + ", targetKey=" + targetKey + ", data=" + messageData + "]";
+    }
+
+    /**
+     * Get the timeout to wait for a reply.
+     *
+     * @return the timeout in milliseconds
+     */
+    public int getReplyTimeout() {
+        return replyTimeout;
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/EngDepAction.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/EngDepAction.java
new file mode 100644
index 000000000..b46fe59b9
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/EngDepAction.java
@@ -0,0 +1,94 @@
+/*-
+ * ============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.core.protocols.engdep;
+
+import org.onap.policy.apex.core.protocols.Action;
+
+/**
+ * Action types the EngDep messaging protocol supports.
+ *
+ * @author Sajeevan Achuthan (sajeevan.achuthan@ericsson.com)
+ */
+public enum EngDepAction implements Action {
+    /** Action to get information on the running engine service. */
+    GET_ENGINE_SERVICE_INFO {
+        @Override
+        public String getActionString() {
+            return "Apex engine service information";
+        }
+    },
+    /** Action to update the policy model in an engine service. */
+    UPDATE_MODEL {
+        @Override
+        public String getActionString() {
+            return "update model on Apex engine service";
+        }
+    },
+    /** Action to start an engine service. */
+    START_ENGINE {
+        @Override
+        public String getActionString() {
+            return "starts an Apex engine";
+        }
+    },
+    /** Action to stop an engine service. */
+    STOP_ENGINE {
+        @Override
+        public String getActionString() {
+            return "stops an Apex engine service";
+        }
+    },
+    /** Action to start sending periodic events to an engine service. */
+    START_PERIODIC_EVENTS {
+        @Override
+        public String getActionString() {
+            return "starts periodic events on an Apex engine service";
+        }
+    },
+    /** Action to stop sending periodic events to an engine service. */
+    STOP_PERIODIC_EVENTS {
+        @Override
+        public String getActionString() {
+            return "stops periodic events on an Apex engine service";
+        }
+    },
+    /** Action to get the status of an engine in the engine service. */
+    GET_ENGINE_STATUS {
+        @Override
+        public String getActionString() {
+            return "gets the status of an Apex engine service";
+        }
+    },
+    /** Action to get information on an engine in the engine service. */
+    GET_ENGINE_INFO {
+        @Override
+        public String getActionString() {
+            return "gets runtime information an Apex engine service";
+        }
+    },
+    /** The response message to all actions. */
+    RESPONSE {
+        @Override
+        public String getActionString() {
+            return "response from Apex engine service";
+        }
+    };
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/EngineServiceInfoResponse.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/EngineServiceInfoResponse.java
new file mode 100644
index 000000000..be0bfb2c5
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/EngineServiceInfoResponse.java
@@ -0,0 +1,124 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import java.util.Collection;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class Response is a message that holds the response by an Apex engine to another Actino message sent to that
+ * engine.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class EngineServiceInfoResponse extends Response {
+    private static final long serialVersionUID = -7895025789667402067L;
+
+    // The engine service key
+    private AxArtifactKey engineServiceKey;
+
+    // The engines under the control of this engine service
+    private AxArtifactKey[] engineKeyArray;
+
+    // The engine service key
+    private AxArtifactKey apexModelKey;
+
+    /**
+     * Instantiates a new EngineServiceInfoResponse message.
+     *
+     * @param targetKey the target key of the entity that asked for the action that triggered this response message
+     * @param successful the successful if the action in the triggering message worked
+     * @param responseTo the message to which this message is a response
+     */
+    public EngineServiceInfoResponse(final AxArtifactKey targetKey, final boolean successful,
+            final Message responseTo) {
+        super(targetKey, successful, null, responseTo);
+    }
+
+    /**
+     * Instantiates a new EngineServiceInfoResponse message.
+     *
+     * @param targetKey the target key of the entity that asked for the action that triggered this response message
+     * @param successful the successful if the action in the triggering message worked
+     * @param messageData the message data which may indicate specific conditions for the response
+     * @param responseTo the message to which this message is a response
+     */
+    public EngineServiceInfoResponse(final AxArtifactKey targetKey, final boolean successful, final String messageData,
+            final Message responseTo) {
+        super(targetKey, successful, messageData, responseTo);
+    }
+
+    /**
+     * Gets the engine service key.
+     *
+     * @return the engine service key
+     */
+    public AxArtifactKey getEngineServiceKey() {
+        return engineServiceKey;
+    }
+
+    /**
+     * Sets the engine service key.
+     *
+     * @param engineServiceKey the engine service key
+     */
+    public void setEngineServiceKey(final AxArtifactKey engineServiceKey) {
+        this.engineServiceKey = engineServiceKey;
+    }
+
+    /**
+     * Gets the engine key array.
+     *
+     * @return the engine key array
+     */
+    public AxArtifactKey[] getEngineKeyArray() {
+        return engineKeyArray;
+    }
+
+    /**
+     * Sets the engine key array.
+     *
+     * @param engineKeyCollection the engine key array
+     */
+    public void setEngineKeyArray(final Collection<AxArtifactKey> engineKeyCollection) {
+        engineKeyArray = engineKeyCollection.toArray(new AxArtifactKey[engineKeyCollection.size()]);
+    }
+
+    /**
+     * Gets the apex model key.
+     *
+     * @return the apex model key
+     */
+    public AxArtifactKey getApexModelKey() {
+        return apexModelKey;
+    }
+
+    /**
+     * Sets the apex model key.
+     *
+     * @param apexModelKey the apex model key
+     */
+    public void setApexModelKey(final AxArtifactKey apexModelKey) {
+        this.apexModelKey = apexModelKey;
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/GetEngineInfo.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/GetEngineInfo.java
new file mode 100644
index 000000000..5b53856d8
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/GetEngineInfo.java
@@ -0,0 +1,63 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class GetEngineInfo is a message that requests information on Apex engines and the policies they are running.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class GetEngineInfo extends Message {
+    private static final long serialVersionUID = 5885214410842753037L;
+
+    /**
+     * Instantiates a new GetEngineInfo message.
+     *
+     * @param engineKey the key the engine for which the runtime information is requested
+     */
+    public GetEngineInfo(final AxArtifactKey engineKey) {
+        this(engineKey, null);
+    }
+
+    /**
+     * Instantiates a new GetEngineInfo message.
+     *
+     * @param engineKey the key the engine for which the runtime information is requested
+     * @param messageData the message data that may give specifics on what information to return
+     */
+    public GetEngineInfo(final AxArtifactKey engineKey, final String messageData) {
+        super(EngDepAction.GET_ENGINE_INFO, engineKey, messageData);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.model.protocols.Message#toString()
+     */
+    @Override
+    public String toString() {
+        return "GetEngineInfo {" + super.toString() + "}[]";
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/GetEngineServiceInfo.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/GetEngineServiceInfo.java
new file mode 100644
index 000000000..bdab1ce9f
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/GetEngineServiceInfo.java
@@ -0,0 +1,63 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class GetEngineServiceInfo is a message that requests information on what is in an Apex engine service.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class GetEngineServiceInfo extends Message {
+    private static final long serialVersionUID = 5885214410842753037L;
+
+    /**
+     * Instantiates a new GetEngineServiceInfo message.
+     *
+     * @param nullKey not used, set to null
+     */
+    public GetEngineServiceInfo(final AxArtifactKey nullKey) {
+        this(nullKey, null);
+    }
+
+    /**
+     * Instantiates a new GetEngineServiceInfo message.
+     *
+     * @param nullKey not used, set to null
+     * @param messageData the message data that may give specifics on what information to return
+     */
+    public GetEngineServiceInfo(final AxArtifactKey nullKey, final String messageData) {
+        super(EngDepAction.GET_ENGINE_SERVICE_INFO, nullKey, messageData);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.model.protocols.Message#toString()
+     */
+    @Override
+    public String toString() {
+        return "GetEngineServiceInfo {" + super.toString() + "}[]";
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/GetEngineStatus.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/GetEngineStatus.java
new file mode 100644
index 000000000..59c345647
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/GetEngineStatus.java
@@ -0,0 +1,63 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class GetEngineInfo is a message that requests information on Apex engines and the policies they are running.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class GetEngineStatus extends Message {
+    private static final long serialVersionUID = 5885214410842753037L;
+
+    /**
+     * Instantiates a new GetEngineStatus message.
+     *
+     * @param engineKey the key of the engine for which the status information is requested
+     */
+    public GetEngineStatus(final AxArtifactKey engineKey) {
+        this(engineKey, null);
+    }
+
+    /**
+     * Instantiates a new GetEngineStatus message.
+     *
+     * @param engineKey the key of the engine for which the status information is requested
+     * @param messageData the message data that may give specifics on what information to return
+     */
+    public GetEngineStatus(final AxArtifactKey engineKey, final String messageData) {
+        super(EngDepAction.GET_ENGINE_STATUS, engineKey, messageData);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.model.protocols.Message#toString()
+     */
+    @Override
+    public String toString() {
+        return "GetEngineStatus {" + super.toString() + "}[]";
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/Response.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/Response.java
new file mode 100644
index 000000000..69e36baed
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/Response.java
@@ -0,0 +1,144 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class Response is a message that holds the response by an Apex engine to another Actino message sent to that
+ * engine.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class Response extends Message {
+    private static final int HASH_PRIME = 31;
+
+    private static final long serialVersionUID = -4162385039044294476L;
+
+    private boolean successful = false;
+    private Message responseTo = null;
+
+    /**
+     * Instantiates a new Response message.
+     *
+     * @param targetKey the target key of the entity that asked for the action that triggered this response message
+     * @param successful the successful if the action in the triggering message worked
+     * @param responseTo the message to which this message is a response
+     */
+    public Response(final AxArtifactKey targetKey, final boolean successful, final Message responseTo) {
+        this(targetKey, successful, null, responseTo);
+    }
+
+    /**
+     * Instantiates a new Response message.
+     *
+     * @param targetKey the target key of the entity that asked for the action that triggered this response message
+     * @param successful the successful if the action in the triggering message worked
+     * @param messageData the message data which may indicate specific conditions for the response
+     * @param responseTo the message to which this message is a response
+     */
+    public Response(final AxArtifactKey targetKey, final boolean successful, final String messageData,
+            final Message responseTo) {
+        super(EngDepAction.RESPONSE, targetKey, messageData);
+        this.successful = successful;
+        this.responseTo = responseTo;
+    }
+
+    /**
+     * Checks if the action to which this is a response was successful.
+     *
+     * @return true, if is successful
+     */
+    public boolean isSuccessful() {
+        return successful;
+    }
+
+    /**
+     * Gets the message to which this message is a response to.
+     *
+     * @return the the message to which this message is a response to
+     */
+    public Message getResponseTo() {
+        return responseTo;
+    }
+
+    /**
+     * Compare this message to another Response message.
+     *
+     * @param otherMessage the other message
+     * @return true, if successful
+     */
+    public boolean equals(final Response otherMessage) {
+        return super.equals(otherMessage) && successful == otherMessage.successful
+                && responseTo.equals(otherMessage.responseTo);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.protocols.Message#equals(java.lang.Object)
+     */
+    @Override
+    public boolean equals(final Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        if (!super.equals(o)) {
+            return false;
+        }
+
+        final Response response = (Response) o;
+
+        if (successful != response.successful) {
+            return false;
+        }
+        return !(responseTo != null ? !responseTo.equals(response.responseTo) : response.responseTo != null);
+
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.protocols.Message#hashCode()
+     */
+    @Override
+    public int hashCode() {
+        int result = super.hashCode();
+        result = HASH_PRIME * result + (successful ? 1 : 0);
+        result = HASH_PRIME * result + (responseTo != null ? responseTo.hashCode() : 0);
+        return result;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.model.protocols.Message#toString()
+     */
+    @Override
+    public String toString() {
+        return "Response {" + super.toString() + "}[successful=" + successful + "]";
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StartEngine.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StartEngine.java
new file mode 100644
index 000000000..81353236f
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StartEngine.java
@@ -0,0 +1,63 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class StartEngine is a message that requests that an Apex engine in an engine service be started.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class StartEngine extends Message {
+    private static final long serialVersionUID = 5885214410842753037L;
+
+    /**
+     * Instantiates a new StartEngine message.
+     *
+     * @param engineKey the key of the engine to start
+     */
+    public StartEngine(final AxArtifactKey engineKey) {
+        this(engineKey, null);
+    }
+
+    /**
+     * Instantiates a new StartEngine message.
+     *
+     * @param engineKey the key of the engine to start
+     * @param messageData the message data that may give specifics on what way to start
+     */
+    public StartEngine(final AxArtifactKey engineKey, final String messageData) {
+        super(EngDepAction.START_ENGINE, engineKey, messageData);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.model.protocols.Message#toString()
+     */
+    @Override
+    public String toString() {
+        return "StartEngine {" + super.toString() + "}[]";
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StartPeriodicEvents.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StartPeriodicEvents.java
new file mode 100644
index 000000000..421669f97
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StartPeriodicEvents.java
@@ -0,0 +1,63 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class StartEngine is a message that requests that an Apex engine in an engine service be started.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class StartPeriodicEvents extends Message {
+    private static final long serialVersionUID = -9172376034035242135L;
+
+    /**
+     * Instantiates a new StartEngine message.
+     *
+     * @param engineKey the key of the engine to start
+     */
+    public StartPeriodicEvents(final AxArtifactKey engineKey) {
+        this(engineKey, null);
+    }
+
+    /**
+     * Instantiates a new StartEngine message.
+     *
+     * @param engineKey the key of the engine to start
+     * @param messageData the message data that may give specifics on what way to start
+     */
+    public StartPeriodicEvents(final AxArtifactKey engineKey, final String messageData) {
+        super(EngDepAction.START_PERIODIC_EVENTS, engineKey, messageData);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.model.protocols.Message#toString()
+     */
+    @Override
+    public String toString() {
+        return "StartPeriodicEvents {" + super.toString() + "}[]";
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StopEngine.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StopEngine.java
new file mode 100644
index 000000000..33e66ba6d
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StopEngine.java
@@ -0,0 +1,63 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class StopEngine is a message that requests that an Apex engine in an engine service be stopped.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class StopEngine extends Message {
+    private static final long serialVersionUID = 5885214410842753037L;
+
+    /**
+     * Instantiates a new StopEngine message.
+     *
+     * @param engineKey the key of the engine to stop
+     */
+    public StopEngine(final AxArtifactKey engineKey) {
+        this(engineKey, null);
+    }
+
+    /**
+     * Instantiates a new StopEngine message.
+     *
+     * @param engineKey the key of the engine to stop
+     * @param messageData the message data that may give specifics on what way to stop
+     */
+    public StopEngine(final AxArtifactKey engineKey, final String messageData) {
+        super(EngDepAction.STOP_ENGINE, engineKey, messageData);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.model.protocols.Message#toString()
+     */
+    @Override
+    public String toString() {
+        return "StopEngine {" + super.toString() + "}[]";
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StopPeriodicEvents.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StopPeriodicEvents.java
new file mode 100644
index 000000000..49f80ecb0
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/StopPeriodicEvents.java
@@ -0,0 +1,63 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class StopEngine is a message that requests that an Apex engine in an engine service be stopped.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class StopPeriodicEvents extends Message {
+    private static final long serialVersionUID = -1796422638427413285L;
+
+    /**
+     * Instantiates a new StopEngine message.
+     *
+     * @param engineKey the key of the engine to stop
+     */
+    public StopPeriodicEvents(final AxArtifactKey engineKey) {
+        this(engineKey, null);
+    }
+
+    /**
+     * Instantiates a new StopEngine message.
+     *
+     * @param engineKey the key of the engine to stop
+     * @param messageData the message data that may give specifics on what way to stop
+     */
+    public StopPeriodicEvents(final AxArtifactKey engineKey, final String messageData) {
+        super(EngDepAction.STOP_PERIODIC_EVENTS, engineKey, messageData);
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.model.protocols.Message#toString()
+     */
+    @Override
+    public String toString() {
+        return "StopPeriodicEvents {" + super.toString() + "}[]";
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/UpdateModel.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/UpdateModel.java
new file mode 100644
index 000000000..8d6d315ce
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/UpdateModel.java
@@ -0,0 +1,100 @@
+/*-
+ * ============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.core.protocols.engdep.messages;
+
+import org.onap.policy.apex.core.protocols.Message;
+import org.onap.policy.apex.core.protocols.engdep.EngDepAction;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+
+/**
+ * The Class UpdateModel is a message that requests an Apex engine to update its model using the data provided in the
+ * message.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class UpdateModel extends Message {
+    private static final long serialVersionUID = 5885214410842753037L;
+
+    // The reply timeout value for update messages
+    private static final int UPDATE_MODEL_REPLY_TIMEOUT = 30000;
+
+    // Flags indicating whether conflicts in context should be ignored and whether the model should be forced even if it
+    // is incompatible
+    private boolean ignoreConflicts = false;
+    private boolean forceInstall = false;
+
+    /**
+     * Instantiates a new update model message.
+     *
+     * @param engineServiceKey the key of the engine service in which the model of all engines will be updated
+     */
+    public UpdateModel(final AxArtifactKey engineServiceKey) {
+        this(engineServiceKey, null, false, false);
+    }
+
+    /**
+     * Instantiates a new update model message.
+     *
+     * @param engineServiceKey the key of the engine service in which the model of all engines will be updated
+     * @param messageData the message data that indicates to the Apex engine the manner in which its model should be
+     *        updated
+     * @param ignoreConflicts true if conflicts between context in polices is to be ignored
+     * @param force true if the model is to be applied even if it is incompatible with the existing model
+     */
+    public UpdateModel(final AxArtifactKey engineServiceKey, final String messageData, final boolean ignoreConflicts,
+            final boolean force) {
+        super(EngDepAction.UPDATE_MODEL, engineServiceKey, messageData);
+
+        this.ignoreConflicts = ignoreConflicts;
+        this.forceInstall = force;
+
+        // Update messages have a longer timeout
+        setReplyTimeout(UPDATE_MODEL_REPLY_TIMEOUT);
+    }
+
+    /**
+     * Check if context conflicts should be ignored.
+     *
+     * @return true if conflicts should be ignored
+     */
+    public boolean isIgnoreConflicts() {
+        return ignoreConflicts;
+    }
+
+    /**
+     * Check if version checks should be overridden.
+     *
+     * @return true if version checks should be overridden
+     */
+    public boolean isForceInstall() {
+        return forceInstall;
+    }
+
+    /*
+     * (non-Javadoc)
+     *
+     * @see org.onap.policy.apex.core.model.protocols.Message#toString()
+     */
+    @Override
+    public String toString() {
+        return "UpdateModel {" + super.toString() + "}[]";
+    }
+}
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/package-info.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/package-info.java
new file mode 100644
index 000000000..3c9a5e856
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/messages/package-info.java
@@ -0,0 +1,27 @@
+/*-
+ * ============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=========================================================
+ */
+
+/**
+ * Provides classes that define the EngDep messages.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+
+package org.onap.policy.apex.core.protocols.engdep.messages;
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/package-info.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/package-info.java
new file mode 100644
index 000000000..5d8fd7893
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/engdep/package-info.java
@@ -0,0 +1,27 @@
+/*-
+ * ============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=========================================================
+ */
+
+/**
+ * Provides the EngDep protocol for communication between the APEX Engine and Apex deployment.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+
+package org.onap.policy.apex.core.protocols.engdep;
diff --git a/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/package-info.java b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/package-info.java
new file mode 100644
index 000000000..fceef33e2
--- /dev/null
+++ b/core/core-protocols/src/main/java/org/onap/policy/apex/core/protocols/package-info.java
@@ -0,0 +1,27 @@
+/*-
+ * ============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 protocols that are used for communication in APEX.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+
+package org.onap.policy.apex.core.protocols;
diff --git a/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/GetExecutionStatusTest.java b/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/GetExecutionStatusTest.java
new file mode 100644
index 000000000..d5cf2bcba
--- /dev/null
+++ b/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/GetExecutionStatusTest.java
@@ -0,0 +1,58 @@
+/*-
+ * ============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.core.protocols.engdep;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.net.UnknownHostException;
+
+import org.junit.Test;
+import org.onap.policy.apex.core.protocols.engdep.messages.GetEngineStatus;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.slf4j.ext.XLogger;
+import org.slf4j.ext.XLoggerFactory;
+
+/**
+ * The Class GetExecutionStatusTest.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class GetExecutionStatusTest {
+    // Logger for this class
+    private static final XLogger logger = XLoggerFactory.getXLogger(GetExecutionStatusTest.class);
+
+    GetEngineStatus message = null;
+
+    /**
+     * Test register entity.
+     *
+     * @throws UnknownHostException the unknown host exception
+     */
+    @Test
+    public void testRegisterEntity() throws UnknownHostException {
+        final AxArtifactKey targetKey = new AxArtifactKey("UpdateModelTest", "0.0.1");
+        message = new GetEngineStatus(targetKey);
+        assertNotNull(message);
+        logger.debug(message.toString());
+        assertTrue((message.toString()).contains("UpdateModelTest"));
+    }
+}
diff --git a/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/GetPolicyStatusTest.java b/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/GetPolicyStatusTest.java
new file mode 100644
index 000000000..97cc8d5b9
--- /dev/null
+++ b/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/GetPolicyStatusTest.java
@@ -0,0 +1,58 @@
+/*-
+ * ============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.core.protocols.engdep;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.net.UnknownHostException;
+
+import org.junit.Test;
+import org.onap.policy.apex.core.protocols.engdep.messages.GetEngineStatus;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.slf4j.ext.XLogger;
+import org.slf4j.ext.XLoggerFactory;
+
+/**
+ * The Class GetPolicyStatusTest.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class GetPolicyStatusTest {
+    // Logger for this class
+    private static final XLogger logger = XLoggerFactory.getXLogger(GetPolicyStatusTest.class);
+
+    GetEngineStatus message = null;
+
+    /**
+     * Test register entity.
+     *
+     * @throws UnknownHostException the unknown host exception
+     */
+    @Test
+    public void testRegisterEntity() throws UnknownHostException {
+        final AxArtifactKey targetKey = new AxArtifactKey("PolicyStatusTest", "0.0.1");
+        message = new GetEngineStatus(targetKey);
+        assertNotNull(message);
+        logger.debug(message.toString());
+        assertTrue((message.toString()).contains("PolicyStatusTest"));
+    }
+}
diff --git a/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/ResponseTest.java b/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/ResponseTest.java
new file mode 100644
index 000000000..74def7cc0
--- /dev/null
+++ b/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/ResponseTest.java
@@ -0,0 +1,65 @@
+/*-
+ * ============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.core.protocols.engdep;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.net.UnknownHostException;
+
+import org.junit.Test;
+import org.onap.policy.apex.core.protocols.engdep.messages.Response;
+import org.onap.policy.apex.core.protocols.engdep.messages.UpdateModel;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.slf4j.ext.XLogger;
+import org.slf4j.ext.XLoggerFactory;
+
+/**
+ * The Class ResponseTest.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class ResponseTest {
+    // Logger for this class
+    private static final XLogger logger = XLoggerFactory.getXLogger(ResponseTest.class);
+
+    Response message = null;
+
+    /**
+     * Test response.
+     *
+     * @throws UnknownHostException the unknown host exception
+     */
+    @Test
+    public void testResponse() throws UnknownHostException {
+        final AxArtifactKey responseKey = new AxArtifactKey("ResponseTest", "0.0.1");
+        final AxArtifactKey responseToKey = new AxArtifactKey("ResponseTestTO", "0.0.1");
+        message = new Response(responseKey, false, new UpdateModel(responseToKey));
+        logger.debug(message.toString());
+        assertTrue(message.toString().contains("ResponseTest"));
+        assertFalse(message.isSuccessful());
+
+        message = new Response(responseKey, true, new UpdateModel(responseToKey));
+        logger.debug(message.toString());
+        assertTrue(message.toString().contains("ResponseTest"));
+        assertTrue(message.isSuccessful());
+    }
+}
diff --git a/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/UpdateModelTest.java b/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/UpdateModelTest.java
new file mode 100644
index 000000000..ca919c389
--- /dev/null
+++ b/core/core-protocols/src/test/java/org/onap/policy/apex/core/protocols/engdep/UpdateModelTest.java
@@ -0,0 +1,58 @@
+/*-
+ * ============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.core.protocols.engdep;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.net.UnknownHostException;
+
+import org.junit.Test;
+import org.onap.policy.apex.core.protocols.engdep.messages.UpdateModel;
+import org.onap.policy.apex.model.basicmodel.concepts.AxArtifactKey;
+import org.slf4j.ext.XLogger;
+import org.slf4j.ext.XLoggerFactory;
+
+/**
+ * The Class UpdateModelTest.
+ *
+ * @author Liam Fallon (liam.fallon@ericsson.com)
+ */
+public class UpdateModelTest {
+    // Logger for this class
+    private static final XLogger logger = XLoggerFactory.getXLogger(UpdateModelTest.class);
+
+    UpdateModel message = null;
+
+    /**
+     * Test register entity.
+     *
+     * @throws UnknownHostException the unknown host exception
+     */
+    @Test
+    public void testRegisterEntity() throws UnknownHostException {
+        final AxArtifactKey targetKey = new AxArtifactKey("UpdateModelTest", "0.0.1");
+        message = new UpdateModel(targetKey, new String("Placeholder for Apex model XML"), false, false);
+        assertNotNull(message);
+        logger.debug(message.toString());
+        assertTrue((message.toString()).contains("Placeholder for Apex model XML"));
+    }
+}
diff --git a/core/core-protocols/src/test/resources/logback-test.xml b/core/core-protocols/src/test/resources/logback-test.xml
new file mode 100644
index 000000000..034511335
--- /dev/null
+++ b/core/core-protocols/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>