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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2019-2021 Nordix Foundation.
* Modifications Copyright (C) 2021 Bell Canada. All rights reserved.
* Modifications Copyright (C) 2021 AT&T Intellectual Property. 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.jms;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import lombok.Getter;
import lombok.NoArgsConstructor;
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.ApexEventProtocolConverter;
import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
import org.onap.policy.apex.service.parameters.eventprotocol.EventProtocolParameters;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* The Class Apex2JMSObjectEventConverter converts {@link ApexEvent} instances into string instances of object message
* events for JMS.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
@Getter
@NoArgsConstructor
public final class Apex2JmsObjectEventConverter implements ApexEventProtocolConverter {
private static final XLogger LOGGER = XLoggerFactory.getXLogger(Apex2JmsObjectEventConverter.class);
// JMS event protocol parameters on the consumer (JMS->Apex) sides
private JmsObjectEventProtocolParameters eventProtocolParameters = null;
@Override
public void init(final EventProtocolParameters parameters) {
// Check if properties have been set for JMS object event conversion as a consumer. They may not be set because
// JMS may not be in use
// on both sides of Apex
if (!(parameters instanceof JmsObjectEventProtocolParameters)) {
final String errormessage = "specified Event Protocol Parameters properties of type \""
+ parameters.getClass().getName() + "\" are not applicable to a "
+ Apex2JmsObjectEventConverter.class.getName() + " converter";
LOGGER.error(errormessage);
} else {
this.eventProtocolParameters = (JmsObjectEventProtocolParameters) parameters;
}
}
/**
* {@inheritDoc}.
*/
@Override
public List<ApexEvent> toApexEvent(final String eventName, final Object eventObject) throws ApexEventException {
// Look for a "getObject()" method on the incoming object, if there is no such method, then we cannot fetch the
// object from JMS
Method getObjectMethod;
try {
getObjectMethod = eventObject.getClass().getMethod("getObject", (Class<?>[]) null);
} catch (Exception exp) {
final String errorMessage = "message \"" + eventObject
+ "\" received from JMS does not have a \"getObject()\" method";
throw new ApexEventRuntimeException(errorMessage, exp);
}
Object jmsIncomingObject;
try {
jmsIncomingObject = getObjectMethod.invoke(eventObject, (Object[]) null);
} catch (final Exception exp) {
final String errorMessage = "object contained in message \"" + eventObject
+ "\" received from JMS could not be retrieved as a Java object";
throw new ApexEventRuntimeException(errorMessage, exp);
}
// Check that the consumer parameters for JMS->Apex messaging have been set
if (eventProtocolParameters == null) {
final String errorMessage = "consumer parameters for JMS events consumed by "
+ "Apex are not set in the Apex configuration for this engine";
throw new ApexEventRuntimeException(errorMessage);
}
// Create the Apex event
// @formatter:off
final ApexEvent apexEvent = new ApexEvent(
jmsIncomingObject.getClass().getSimpleName() + eventProtocolParameters.getIncomingEventSuffix(),
eventProtocolParameters.getIncomingEventVersion(),
jmsIncomingObject.toString().getClass().getPackage().getName(),
eventProtocolParameters.getIncomingEventSource(),
eventProtocolParameters.getIncomingEventTarget());
// @formatter:on
// Set the data on the apex event as the incoming object
apexEvent.put(jmsIncomingObject.getClass().getSimpleName(), jmsIncomingObject);
// Return the event in a single element
final ArrayList<ApexEvent> eventList = new ArrayList<>();
eventList.add(apexEvent);
return eventList;
}
/**
* {@inheritDoc}.
*/
@Override
public Object fromApexEvent(final ApexEvent apexEvent) throws ApexEventException {
// Check the Apex event
if (apexEvent == null) {
throw new ApexEventException("event processing failed, Apex event is null");
}
// Check that the Apex event has a single parameter
if (apexEvent.size() != 1) {
final String errorMessage = "event processing failed, "
+ "Apex event must have one and only one parameter for JMS Object handling";
throw new ApexEventException(errorMessage);
}
// Return the single object from the Apex event message
return apexEvent.values().iterator().next();
}
}
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