2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2016-2018 Ericsson. All rights reserved.
4 * Modifications Copyright (C) 2019 Nordix Foundation.
5 * ================================================================================
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
18 * SPDX-License-Identifier: Apache-2.0
19 * ============LICENSE_END=========================================================
22 package org.onap.policy.apex.plugins.event.protocol.jms;
24 import java.lang.reflect.Method;
25 import java.util.ArrayList;
26 import java.util.List;
27 import org.onap.policy.apex.service.engine.event.ApexEvent;
28 import org.onap.policy.apex.service.engine.event.ApexEventException;
29 import org.onap.policy.apex.service.engine.event.ApexEventProtocolConverter;
30 import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
31 import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParameters;
32 import org.slf4j.ext.XLogger;
33 import org.slf4j.ext.XLoggerFactory;
36 * The Class Apex2JMSObjectEventConverter converts {@link ApexEvent} instances into string instances of object message
39 * @author Liam Fallon (liam.fallon@ericsson.com)
41 public final class Apex2JmsObjectEventConverter implements ApexEventProtocolConverter {
42 private static final XLogger LOGGER = XLoggerFactory.getXLogger(Apex2JmsObjectEventConverter.class);
44 // JMS event protocol parameters on the consumer (JMS->Apex) sides
45 private JmsObjectEventProtocolParameters eventProtocolParameters = null;
48 * Constructor to create the Apex to JMS Object converter.
50 * @throws ApexEventException the apex event exception
52 public Apex2JmsObjectEventConverter() throws ApexEventException {
53 // Nothing specific to initiate for this plugin
57 public void init(final EventProtocolParameters parameters) {
58 // Check if properties have been set for JMS object event conversion as a consumer. They may not be set because
59 // JMS may not be in use
60 // on both sides of Apex
61 if (!(parameters instanceof JmsObjectEventProtocolParameters)) {
62 final String errormessage = "specified Event Protocol Parameters properties of type \""
63 + parameters.getClass().getName() + "\" are not applicable to a "
64 + Apex2JmsObjectEventConverter.class.getName() + " converter";
65 LOGGER.error(errormessage);
67 this.eventProtocolParameters = (JmsObjectEventProtocolParameters) parameters;
76 public List<ApexEvent> toApexEvent(final String eventName, final Object eventObject) throws ApexEventException {
77 // Look for a "getObject()" method on the incoming object, if there is no such method, then we cannot fetch the
79 Method getObjectMethod;
81 getObjectMethod = eventObject.getClass().getMethod("getObject", (Class<?>[]) null);
82 } catch (Exception e) {
83 final String errorMessage = "message \"" + eventObject
84 + "\" received from JMS does not have a \"getObject()\" method";
85 LOGGER.warn(errorMessage, e);
86 throw new ApexEventRuntimeException(errorMessage);
89 Object jmsIncomingObject;
91 jmsIncomingObject = getObjectMethod.invoke(eventObject, (Object[]) null);
92 } catch (final Exception e) {
93 final String errorMessage = "object contained in message \"" + eventObject
94 + "\" received from JMS could not be retrieved as a Java object";
95 LOGGER.debug(errorMessage, e);
96 throw new ApexEventRuntimeException(errorMessage, e);
99 // Check that the consumer parameters for JMS->Apex messaging have been set
100 if (eventProtocolParameters == null) {
101 final String errorMessage = "consumer parameters for JMS events consumed by "
102 + "Apex are not set in the Apex configuration for this engine";
103 LOGGER.debug(errorMessage);
104 throw new ApexEventRuntimeException(errorMessage);
107 // Create the Apex event
109 final ApexEvent apexEvent = new ApexEvent(
110 jmsIncomingObject.getClass().getSimpleName() + eventProtocolParameters.getIncomingEventSuffix(),
111 eventProtocolParameters.getIncomingEventVersion(),
112 jmsIncomingObject.toString().getClass().getPackage().getName(),
113 eventProtocolParameters.getIncomingEventSource(),
114 eventProtocolParameters.getIncomingEventTarget());
117 // Set the data on the apex event as the incoming object
118 apexEvent.put(jmsIncomingObject.getClass().getSimpleName(), jmsIncomingObject);
120 // Return the event in a single element
121 final ArrayList<ApexEvent> eventList = new ArrayList<>();
122 eventList.add(apexEvent);
130 public Object fromApexEvent(final ApexEvent apexEvent) throws ApexEventException {
131 // Check the Apex event
132 if (apexEvent == null) {
133 LOGGER.warn("event processing failed, Apex event is null");
134 throw new ApexEventException("event processing failed, Apex event is null");
137 // Check that the Apex event has a single parameter
138 if (apexEvent.size() != 1) {
139 final String errorMessage = "event processing failed, "
140 + "Apex event must have one and only one parameter for JMS Object handling";
141 LOGGER.warn(errorMessage);
142 throw new ApexEventException(errorMessage);
145 // Return the single object from the Apex event message
146 return apexEvent.values().iterator().next();