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/*-
* ============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.service.engine.event.impl.apexprotocolplugin;
import java.util.ArrayList;
import java.util.List;
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.ApexEventList;
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 Apex2ApexEventConverter passes through {@link ApexEvent} instances. It is used for
* transferring Apex events directly as POJOs between APEX producers and consumers.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class Apex2ApexEventConverter implements ApexEventProtocolConverter {
private static final XLogger LOGGER = XLoggerFactory.getXLogger(Apex2ApexEventConverter.class);
/**
* {@inheritDoc}.
*/
@Override
public void init(final EventProtocolParameters parameters) {
// Check and get the APEX parameters
if (!(parameters instanceof ApexEventProtocolParameters)) {
final String errorMessage = "specified consumer properties are not applicable to the APEX event protocol";
LOGGER.warn(errorMessage);
throw new ApexEventRuntimeException(errorMessage);
}
}
/**
* {@inheritDoc}.
*/
@Override
public List<ApexEvent> toApexEvent(final String eventName, final Object eventObject) throws ApexEventException {
// Check the event eventObject
if (eventObject == null) {
LOGGER.warn("event processing failed, event is null");
throw new ApexEventException("event processing failed, event is null");
}
// The list of events we will return
final List<ApexEvent> eventList = new ArrayList<>();
try {
// Check if its a single APEX event
if (!(eventObject instanceof ApexEvent)) {
throw new ApexEventException("incoming event (" + eventObject + ") is not an ApexEvent");
}
final ApexEvent event = (ApexEvent) eventObject;
// Check whether we have any ApexEventList fields, if so this is an event of events and
// all fields should be of type ApexEventList
boolean foundEventListFields = false;
boolean foundOtherFields = false;
for (final Object fieldObject : event.values()) {
if (fieldObject instanceof ApexEventList) {
foundEventListFields = true;
// Add the events to the event list
eventList.addAll((ApexEventList) fieldObject);
} else {
foundOtherFields = true;
}
}
// If we found both event list fields and other fields we're in trouble
if (foundEventListFields && foundOtherFields) {
throw new ApexEventException("incoming event (" + eventObject
+ ") has both event list fields and other fields, it cannot be processed");
}
// Check if the incoming event just has other fields, if so it's just a regular event
// and we add it to the event list as the only event there
if (foundOtherFields) {
eventList.add(event);
}
} catch (final Exception e) {
final String errorString = "Failed to unmarshal APEX event: " + e.getMessage() + ", event=" + eventObject;
LOGGER.warn(errorString, e);
throw new ApexEventException(errorString, e);
}
// Return the list of events we have unmarshalled
return eventList;
}
/**
* {@inheritDoc}.
*/
@Override
public Object fromApexEvent(final ApexEvent apexEvent) throws ApexEventException {
// Check the Apex event
if (apexEvent == null) {
LOGGER.warn("event processing failed, Apex event is null");
throw new ApexEventException("event processing failed, Apex event is null");
}
return apexEvent;
}
}
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