Add YAML plugin and cleanup for checkstyle

Bringing in the APEX YAML plugin, allows events with YAML bodies
to be consumed by APEX.

Also clean up of event protocol interface to make it not specific
for JSON.

Also some checkstyle changes on classes impacted by event
protocol interface change.

Change-Id: I7c3867ac508096fd8acad2488e61db87dfa1d6bd
Issue-ID: POLICY-862
Signed-off-by: liamfallon <liam.fallon@ericsson.com>

2 files changed, 522 insertions, 0 deletions

diff --git a/plugins/plugins-event/plugins-event-protocol/plugins-event-protocol-yaml/src/test/java/org/onap/policy/apex/plugins/event/protocol/yaml/TestYamlEventProtocol.java b/plugins/plugins-event/plugins-event-protocol/plugins-event-protocol-yaml/src/test/java/org/onap/policy/apex/plugins/event/protocol/yaml/TestYamlEventProtocol.java
new file mode 100644
index 000000000..40196eb8a
--- /dev/null
+++ b/plugins/plugins-event/plugins-event-protocol/plugins-event-protocol-yaml/src/test/java/org/onap/policy/apex/plugins/event/protocol/yaml/TestYamlEventProtocol.java
@@ -0,0 +1,263 @@
+/*-
+ * ============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=========================================================
+ */
+
+package org.onap.policy.apex.plugins.event.protocol.yaml;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.onap.policy.apex.context.impl.schema.java.JavaSchemaHelperParameters;
+import org.onap.policy.apex.context.parameters.SchemaParameters;
+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.service.ModelService;
+import org.onap.policy.apex.model.basicmodel.service.ParameterService;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchemas;
+import org.onap.policy.apex.model.eventmodel.concepts.AxEvent;
+import org.onap.policy.apex.model.eventmodel.concepts.AxEvents;
+import org.onap.policy.apex.model.eventmodel.concepts.AxField;
+import org.onap.policy.apex.model.utilities.TextFileUtils;
+import org.onap.policy.apex.service.engine.event.ApexEvent;
+import org.onap.policy.apex.service.engine.event.ApexEventException;
+import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer.HeaderDelimitedTextBlockReader;
+import org.onap.policy.apex.service.engine.event.impl.filecarrierplugin.consumer.TextBlock;
+
+public class TestYamlEventProtocol {
+    @BeforeClass
+    public static void registerTestEventsAndSchemas() throws IOException {
+        SchemaParameters schemaParameters = new SchemaParameters();
+        schemaParameters.getSchemaHelperParameterMap().put("JAVA", new JavaSchemaHelperParameters());
+        ParameterService.registerParameters(SchemaParameters.class, schemaParameters);
+
+        AxContextSchemas schemas = new AxContextSchemas();
+
+        AxContextSchema simpleIntSchema = new AxContextSchema(new AxArtifactKey("SimpleIntSchema", "0.0.1"), "JAVA",
+                        "java.lang.Integer");
+        schemas.getSchemasMap().put(simpleIntSchema.getKey(), simpleIntSchema);
+
+        AxContextSchema simpleDoubleSchema = new AxContextSchema(new AxArtifactKey("SimpleDoubleSchema", "0.0.1"), "JAVA",
+                        "java.lang.Double");
+        schemas.getSchemasMap().put(simpleDoubleSchema.getKey(), simpleDoubleSchema);
+
+        AxContextSchema simpleStringSchema = new AxContextSchema(new AxArtifactKey("SimpleStringSchema", "0.0.1"), "JAVA",
+                        "java.lang.String");
+        schemas.getSchemasMap().put(simpleStringSchema.getKey(), simpleStringSchema);
+
+        AxContextSchema arrayListSchema = new AxContextSchema(new AxArtifactKey("ArrayListSchema", "0.0.1"), "JAVA",
+                        "java.util.ArrayList");
+        schemas.getSchemasMap().put(arrayListSchema.getKey(), arrayListSchema);
+
+        AxContextSchema linkedHashMapSchema = new AxContextSchema(new AxArtifactKey("LinkedHashMapSchema", "0.0.1"), "JAVA",
+                        "java.util.LinkedHashMap");
+        schemas.getSchemasMap().put(linkedHashMapSchema.getKey(), linkedHashMapSchema);
+
+        ModelService.registerModel(AxContextSchemas.class, schemas);
+
+        AxEvents events = new AxEvents();
+
+        AxEvent testEvent0 = new AxEvent(new AxArtifactKey("TestEvent0", "0.0.1"));
+        testEvent0.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        events.getEventMap().put(testEvent0.getKey(), testEvent0);
+
+        AxEvent testEvent1 = new AxEvent(new AxArtifactKey("TestEvent1", "0.0.1"));
+        testEvent1.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te1Field0 = new AxField(new AxReferenceKey(testEvent1.getKey(), "yaml_field"),
+                        arrayListSchema.getKey());
+        testEvent1.getParameterMap().put("yaml_field", te1Field0);
+        events.getEventMap().put(testEvent1.getKey(), testEvent1);
+
+        AxEvent testEvent2 = new AxEvent(new AxArtifactKey("TestEvent2", "0.0.1"));
+        testEvent2.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te2Field0 = new AxField(new AxReferenceKey(testEvent2.getKey(), "hr"), simpleIntSchema.getKey());
+        testEvent2.getParameterMap().put("hr", te2Field0);
+        AxField te2Field1 = new AxField(new AxReferenceKey(testEvent2.getKey(), "avg"), simpleDoubleSchema.getKey());
+        testEvent2.getParameterMap().put("avg", te2Field1);
+        AxField te2Field2 = new AxField(new AxReferenceKey(testEvent2.getKey(), "rbi"), simpleIntSchema.getKey());
+        testEvent2.getParameterMap().put("rbi", te2Field2);
+        events.getEventMap().put(testEvent2.getKey(), testEvent2);
+
+        AxEvent testEvent3 = new AxEvent(new AxArtifactKey("TestEvent3", "0.0.1"));
+        testEvent3.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te3Field0 = new AxField(new AxReferenceKey(testEvent3.getKey(), "american"),
+                        arrayListSchema.getKey());
+        testEvent3.getParameterMap().put("american", te3Field0);
+        AxField te3Field1 = new AxField(new AxReferenceKey(testEvent3.getKey(), "national"),
+                        arrayListSchema.getKey());
+        testEvent3.getParameterMap().put("national", te3Field1);
+        events.getEventMap().put(testEvent3.getKey(), testEvent3);
+
+        AxEvent testEvent4 = new AxEvent(new AxArtifactKey("TestEvent4", "0.0.1"));
+        testEvent4.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te4Field0 = new AxField(new AxReferenceKey(testEvent4.getKey(), "yaml_field"),
+                        arrayListSchema.getKey());
+        testEvent4.getParameterMap().put("yaml_field", te4Field0);
+        events.getEventMap().put(testEvent4.getKey(), testEvent4);
+
+        AxEvent testEvent5 = new AxEvent(new AxArtifactKey("TestEvent5", "0.0.1"));
+        testEvent5.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te5Field0 = new AxField(new AxReferenceKey(testEvent5.getKey(), "yaml_field"),
+                        arrayListSchema.getKey());
+        testEvent5.getParameterMap().put("yaml_field", te5Field0);
+        events.getEventMap().put(testEvent5.getKey(), testEvent5);
+
+        AxEvent testEvent6 = new AxEvent(new AxArtifactKey("TestEvent6", "0.0.1"));
+        testEvent6.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te6Field0 = new AxField(new AxReferenceKey(testEvent6.getKey(), "MarkMcGwire"),
+                        linkedHashMapSchema.getKey());
+        testEvent6.getParameterMap().put("Mark McGwire", te6Field0);
+        AxField te6Field1 = new AxField(new AxReferenceKey(testEvent6.getKey(), "SammySosa"),
+                        linkedHashMapSchema.getKey());
+        testEvent6.getParameterMap().put("Sammy Sosa", te6Field1);
+        events.getEventMap().put(testEvent6.getKey(), testEvent6);
+
+        AxEvent testEvent7 = new AxEvent(new AxArtifactKey("TestEvent7", "0.0.1"));
+        testEvent7.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te7Field0 = new AxField(new AxReferenceKey(testEvent7.getKey(), "time"),
+                        simpleIntSchema.getKey());
+        testEvent7.getParameterMap().put("time", te7Field0);
+        AxField te7Field1 = new AxField(new AxReferenceKey(testEvent7.getKey(), "player"),
+                        simpleStringSchema.getKey());
+        testEvent7.getParameterMap().put("player", te7Field1);
+        AxField te7Field2 = new AxField(new AxReferenceKey(testEvent7.getKey(), "action"),
+                        simpleStringSchema.getKey());
+        testEvent7.getParameterMap().put("action", te7Field2);
+        events.getEventMap().put(testEvent7.getKey(), testEvent7);
+
+        AxEvent testEvent8 = new AxEvent(new AxArtifactKey("TestEvent8", "0.0.1"));
+        testEvent8.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te8Field0 = new AxField(new AxReferenceKey(testEvent8.getKey(), "hr"),
+                        arrayListSchema.getKey());
+        testEvent8.getParameterMap().put("hr", te8Field0);
+        AxField te8Field1 = new AxField(new AxReferenceKey(testEvent8.getKey(), "rbi"),
+                        arrayListSchema.getKey());
+        testEvent8.getParameterMap().put("rbi", te8Field1);
+        events.getEventMap().put(testEvent8.getKey(), testEvent8);
+
+        AxEvent testEvent9 = new AxEvent(new AxArtifactKey("TestEvent9", "0.0.1"));
+        testEvent9.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te9Field0 = new AxField(new AxReferenceKey(testEvent9.getKey(), "ChicagoCubs"),
+                        arrayListSchema.getKey());
+        testEvent9.getParameterMap().put("ChicagoCubs", te9Field0);
+        AxField te9Field1 = new AxField(new AxReferenceKey(testEvent9.getKey(), "AtlantaBraves"),
+                        arrayListSchema.getKey());
+        testEvent9.getParameterMap().put("AtlantaBraves", te9Field1);
+        events.getEventMap().put(testEvent9.getKey(), testEvent9);
+
+        AxEvent testEvent10 = new AxEvent(new AxArtifactKey("TestEvent10", "0.0.1"));
+        testEvent10.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te10Field0 = new AxField(new AxReferenceKey(testEvent10.getKey(), "yaml_field"),
+                        arrayListSchema.getKey());
+        testEvent10.getParameterMap().put("yaml_field", te10Field0);
+        events.getEventMap().put(testEvent10.getKey(), testEvent10);
+
+        AxEvent testEvent11 = new AxEvent(new AxArtifactKey("TestEvent11", "0.0.1"));
+        testEvent11.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField te11Field0 = new AxField(new AxReferenceKey(testEvent11.getKey(), "tosca_definitions_version"),
+                        simpleStringSchema.getKey());
+        testEvent11.getParameterMap().put("tosca_definitions_version", te11Field0);
+        AxField te11Field1 = new AxField(new AxReferenceKey(testEvent11.getKey(), "description"),
+                        simpleStringSchema.getKey(), true);
+        testEvent11.getParameterMap().put("description", te11Field1);
+        AxField te11Field2 = new AxField(new AxReferenceKey(testEvent11.getKey(), "node_types"),
+                        linkedHashMapSchema.getKey(), true);
+        testEvent11.getParameterMap().put("node_types", te11Field2);
+        AxField te11Field3 = new AxField(new AxReferenceKey(testEvent11.getKey(), "topology_template"),
+                        linkedHashMapSchema.getKey());
+        testEvent11.getParameterMap().put("topology_template", te11Field3);
+        events.getEventMap().put(testEvent11.getKey(), testEvent11);
+
+        ModelService.registerModel(AxEvents.class, events);
+    }
+
+    @AfterClass
+    public static void unregisterTestEventsAndSchemas() {
+        ModelService.clear();
+    }
+
+    @Test
+    public void testYamlProcessing() throws ApexEventException, IOException {
+        try {
+            testYamlDecodeEncode("TestEvent0", 1, 0, "Empty0");
+            fail("test should fail here");
+        } catch (ApexEventException e) {
+            assertEquals("event processing failed, event is null", e.getMessage());
+        }
+
+        testYamlDecodeEncode("TestEvent0", 1, 0, "Empty1");
+        testYamlDecodeEncode("TestEvent1", 1, 1, "Collection0");
+        testYamlDecodeEncode("TestEvent2", 1, 3, "Collection1");
+        testYamlDecodeEncode("TestEvent3", 1, 2, "Collection2");
+        testYamlDecodeEncode("TestEvent4", 1, 1, "Collection3");
+        testYamlDecodeEncode("TestEvent5", 1, 1, "Collection4");
+        testYamlDecodeEncode("TestEvent6", 1, 2, "Collection5");
+        testYamlDecodeEncode("TestEvent1", 2, 1, "Structure0");
+        testYamlDecodeEncode("TestEvent7", 2, 3, "Structure1");
+        testYamlDecodeEncode("TestEvent8", 1, 2, "Structure2");
+        testYamlDecodeEncode("TestEvent8", 1, 2, "Structure3");
+        testYamlDecodeEncode("TestEvent9", 1, 2, "Structure4");
+        testYamlDecodeEncode("TestEvent10", 1, 1, "Structure5");
+        testYamlDecodeEncode("TestEvent11", 1, 4, "TOSCA0");
+    }
+
+    private void testYamlDecodeEncode(final String eventName, final int eventCount, final int parCount, final String fileName)
+                    throws ApexEventException, IOException {
+        YamlEventProtocolParameters parameters = new YamlEventProtocolParameters();
+        parameters.setDelimiterAtStart(false);
+
+        Apex2YamlEventConverter converter = new Apex2YamlEventConverter();
+        converter.init(parameters);
+
+        String filePath = "src/test/resources/yaml_in/" + fileName + ".yaml";
+        FileInputStream fileInputStream = new FileInputStream(new File(filePath));
+        HeaderDelimitedTextBlockReader reader = new HeaderDelimitedTextBlockReader(parameters);
+        reader.init(fileInputStream);
+       
+        List<ApexEvent> eventList = new ArrayList<>();
+        
+        TextBlock textBlock;
+        do {
+             textBlock = reader.readTextBlock();
+             
+             eventList.addAll(converter.toApexEvent(eventName, textBlock.getText()));
+        } while (!textBlock.isEndOfText());
+        
+        fileInputStream.close();
+
+        assertEquals(eventCount, eventList.size());
+
+        for (int eventNo = 0; eventNo < eventCount; eventNo++) {
+            assertEquals(parCount, eventList.get(0).size());
+
+            String eventYaml = (String) converter.fromApexEvent(eventList.get(eventNo));
+            String expectedYaml = TextFileUtils.getTextFileAsString("src/test/resources/yaml_out/" + fileName + '_' + eventNo + ".yaml");
+            assertEquals(expectedYaml.replaceAll("\\s*", ""), eventYaml.replaceAll("\\s*", ""));
+        }
+    }
+}
diff --git a/plugins/plugins-event/plugins-event-protocol/plugins-event-protocol-yaml/src/test/java/org/onap/policy/apex/plugins/event/protocol/yaml/TestYamlPluginStability.java b/plugins/plugins-event/plugins-event-protocol/plugins-event-protocol-yaml/src/test/java/org/onap/policy/apex/plugins/event/protocol/yaml/TestYamlPluginStability.java
new file mode 100644
index 000000000..126a01df7
--- /dev/null
+++ b/plugins/plugins-event/plugins-event-protocol/plugins-event-protocol-yaml/src/test/java/org/onap/policy/apex/plugins/event/protocol/yaml/TestYamlPluginStability.java
@@ -0,0 +1,259 @@
+/*-
+ * ============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=========================================================
+ */
+package org.onap.policy.apex.plugins.event.protocol.yaml;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.onap.policy.apex.context.impl.schema.java.JavaSchemaHelperParameters;
+import org.onap.policy.apex.context.parameters.SchemaParameters;
+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.service.ModelService;
+import org.onap.policy.apex.model.basicmodel.service.ParameterService;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchema;
+import org.onap.policy.apex.model.contextmodel.concepts.AxContextSchemas;
+import org.onap.policy.apex.model.eventmodel.concepts.AxEvent;
+import org.onap.policy.apex.model.eventmodel.concepts.AxEvents;
+import org.onap.policy.apex.model.eventmodel.concepts.AxField;
+import org.onap.policy.apex.service.engine.event.ApexEvent;
+import org.onap.policy.apex.service.engine.event.ApexEventException;
+import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
+
+public class TestYamlPluginStability {
+    static AxEvent testEvent;
+
+    @BeforeClass
+    public static void registerTestEventsAndSchemas() throws IOException {
+        SchemaParameters schemaParameters = new SchemaParameters();
+        schemaParameters.getSchemaHelperParameterMap().put("JAVA", new JavaSchemaHelperParameters());
+        ParameterService.registerParameters(SchemaParameters.class, schemaParameters);
+
+        AxContextSchemas schemas = new AxContextSchemas();
+
+        AxContextSchema simpleIntSchema = new AxContextSchema(new AxArtifactKey("SimpleIntSchema", "0.0.1"), "JAVA",
+                        "java.lang.Integer");
+        schemas.getSchemasMap().put(simpleIntSchema.getKey(), simpleIntSchema);
+
+        AxContextSchema simpleDoubleSchema = new AxContextSchema(new AxArtifactKey("SimpleDoubleSchema", "0.0.1"),
+                        "JAVA", "java.lang.Double");
+        schemas.getSchemasMap().put(simpleDoubleSchema.getKey(), simpleDoubleSchema);
+
+        AxContextSchema simpleStringSchema = new AxContextSchema(new AxArtifactKey("SimpleStringSchema", "0.0.1"),
+                        "JAVA", "java.lang.String");
+        schemas.getSchemasMap().put(simpleStringSchema.getKey(), simpleStringSchema);
+
+        ModelService.registerModel(AxContextSchemas.class, schemas);
+
+        AxEvents events = new AxEvents();
+
+        testEvent = new AxEvent(new AxArtifactKey("TestEvent", "0.0.1"));
+        testEvent.setNameSpace("org.onap.policy.apex.plugins.event.protocol.yaml");
+        AxField teField0 = new AxField(new AxReferenceKey(testEvent.getKey(), "intValue"), simpleIntSchema.getKey());
+        testEvent.getParameterMap().put("intValue", teField0);
+        AxField teField1 = new AxField(new AxReferenceKey(testEvent.getKey(), "doubleValue"),
+                        simpleDoubleSchema.getKey());
+        testEvent.getParameterMap().put("doubleValue", teField1);
+        AxField teField2 = new AxField(new AxReferenceKey(testEvent.getKey(), "stringValue"),
+                        simpleStringSchema.getKey(), true);
+        testEvent.getParameterMap().put("stringValue", teField2);
+        events.getEventMap().put(testEvent.getKey(), testEvent);
+
+        ModelService.registerModel(AxEvents.class, events);
+    }
+
+    @AfterClass
+    public static void unregisterTestEventsAndSchemas() {
+        ModelService.clear();
+    }
+
+    @Test
+    public void testStability() throws ApexEventException {
+        Apex2YamlEventConverter converter = new Apex2YamlEventConverter();
+
+        try {
+            converter.init(null);
+            fail("this test should throw an exception");
+        } catch (ApexEventRuntimeException e) {
+            assertEquals("specified consumer properties are not applicable to the YAML event protocol", e.getMessage());
+        }
+
+        YamlEventProtocolParameters pars = new YamlEventProtocolParameters();
+        converter.init(pars);
+
+        try {
+            converter.toApexEvent("NonExistantEvent", "");
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertEquals("Failed to unmarshal YAML event: an event definition for an event named \"NonExistantEvent\"",
+                            e.getMessage().substring(0, 89));
+        }
+
+        try {
+            converter.toApexEvent("TestEvent", null);
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertEquals("event processing failed, event is null", e.getMessage());
+        }
+
+        try {
+            converter.toApexEvent("TestEvent", 1);
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertEquals("error converting event \"1\" to a string", e.getMessage());
+        }
+
+        try {
+            converter.toApexEvent("TestEvent", "");
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertTrue(e.getMessage().contains("Field \"doubleValue\" is missing"));
+        }
+
+        try {
+            converter.fromApexEvent(null);
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertEquals("event processing failed, Apex event is null", e.getMessage());
+        }
+
+        ApexEvent apexEvent = new ApexEvent(testEvent.getKey().getName(), testEvent.getKey().getVersion(),
+                        testEvent.getNameSpace(), testEvent.getSource(), testEvent.getTarget());
+        apexEvent.put("doubleValue", 123.45);
+        apexEvent.put("intValue", 123);
+        apexEvent.put("stringValue", "123.45");
+
+        apexEvent.setExceptionMessage("my wonderful exception message");
+        String yamlString = (String) converter.fromApexEvent(apexEvent);
+        assertTrue(yamlString.contains("my wonderful exception message"));
+
+        apexEvent.remove("intValue");
+        try {
+            yamlString = (String) converter.fromApexEvent(apexEvent);
+            fail("this test should throw an exception");
+        } catch (ApexEventRuntimeException e) {
+            assertEquals("error parsing TestEvent:0.0.1 event to Json. Field \"intValue\" is missing",
+                            e.getMessage().substring(0, 72));
+        }
+
+        try {
+            converter.toApexEvent(null, "");
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertEquals("Failed to unmarshal YAML event: event received without mandatory parameter \"name\"",
+                            e.getMessage().substring(0, 81));
+        }
+
+        pars.setNameAlias("TheNameField");
+        try {
+            converter.toApexEvent(null, "");
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertEquals("Failed to unmarshal YAML event: event received without mandatory parameter \"name\"",
+                            e.getMessage().substring(0, 81));
+        }
+
+        apexEvent.put("intValue", 123);
+
+        apexEvent.remove("stringValue");
+        yamlString = (String) converter.fromApexEvent(apexEvent);
+        apexEvent.put("stringValue", "123.45");
+
+        String yamlInputString = "doubleValue: 123.45\n" + "intValue: 123";
+
+        List<ApexEvent> eventList = converter.toApexEvent("TestEvent", yamlInputString);
+        assertEquals(123.45, eventList.get(0).get("doubleValue"));
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: 123\n" + "stringValue: null";
+
+        eventList = converter.toApexEvent("TestEvent", yamlInputString);
+        assertEquals(null, eventList.get(0).get("stringValue"));
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: 123\n" + "stringValue: TestEvent";
+        pars.setNameAlias("stringValue");
+        eventList = converter.toApexEvent(null, yamlInputString);
+        assertEquals("TestEvent", eventList.get(0).get("stringValue"));
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: 123\n" + "stringValue: SomeOtherEvent";
+        eventList = converter.toApexEvent("TestEvent", yamlInputString);
+        assertEquals("SomeOtherEvent", eventList.get(0).get("stringValue"));
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: 123\n" + "stringValue: 0.0.1";
+        pars.setNameAlias(null);
+        pars.setVersionAlias("stringValue");
+        eventList = converter.toApexEvent("TestEvent", yamlInputString);
+        assertEquals("0.0.1", eventList.get(0).get("stringValue"));
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: 123\n" + "stringValue: org.some.other.namespace";
+        pars.setVersionAlias(null);
+        pars.setNameSpaceAlias("stringValue");
+        try {
+            converter.toApexEvent("TestEvent", yamlInputString);
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertEquals("Failed to unmarshal YAML event: namespace \"org.some.other.namespace\" on event",
+                            e.getMessage().substring(0, 77));
+        }
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: 123\n" + "stringValue: org.onap.policy.apex.plugins.event.protocol.yaml";
+        eventList = converter.toApexEvent("TestEvent", yamlInputString);
+        assertEquals("org.onap.policy.apex.plugins.event.protocol.yaml", eventList.get(0).getNameSpace());
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: 123\n" + "stringValue: MySource";
+        pars.setNameSpaceAlias(null);
+        pars.setSourceAlias("stringValue");
+        eventList = converter.toApexEvent("TestEvent", yamlInputString);
+        assertEquals("MySource", eventList.get(0).getSource());
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: 123\n" + "stringValue: MyTarget";
+        pars.setSourceAlias(null);
+        pars.setTargetAlias("stringValue");
+        eventList = converter.toApexEvent("TestEvent", yamlInputString);
+        assertEquals("MyTarget", eventList.get(0).getTarget());
+        pars.setTargetAlias(null);
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: 123\n" + "stringValue: MyString";
+        pars.setSourceAlias(null);
+        pars.setTargetAlias("intValue");
+        try {
+            converter.toApexEvent("TestEvent", yamlInputString);
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertEquals("Failed to unmarshal YAML event: field \"target\" with type \"java.lang.Integer\"",
+                            e.getMessage().substring(0, 76));
+        }
+        pars.setTargetAlias(null);
+
+        yamlInputString = "doubleValue: 123.45\n" + "intValue: ~\n"+ "stringValue: MyString";
+        try {
+            converter.toApexEvent("TestEvent", yamlInputString);
+            fail("this test should throw an exception");
+        } catch (ApexEventException e) {
+            assertTrue(e.getMessage().contains("mandatory field \"intValue\" is missing"));
+        }
+    }
+}