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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2020 Nordix Foundation.
* 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.carrier.restserver;
import java.util.EnumMap;
import java.util.Map;
import java.util.Properties;
import lombok.Getter;
import org.onap.policy.apex.service.engine.event.ApexEventException;
import org.onap.policy.apex.service.engine.event.ApexEventProducer;
import org.onap.policy.apex.service.engine.event.PeeredReference;
import org.onap.policy.apex.service.engine.event.SynchronousEventCache;
import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Concrete implementation of an Apex event producer that sends events using REST.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*
*/
public class ApexRestServerProducer implements ApexEventProducer {
private static final Logger LOGGER = LoggerFactory.getLogger(ApexRestServerProducer.class);
// The name for this producer
@Getter
private String name = null;
// The peer references for this event handler
private Map<EventHandlerPeeredMode, PeeredReference> peerReferenceMap = new EnumMap<>(EventHandlerPeeredMode.class);
/**
* {@inheritDoc}.
*/
@Override
public void init(final String producerName, final EventHandlerParameters producerParameters)
throws ApexEventException {
this.name = producerName;
// Check and get the REST Properties
if (!(producerParameters.getCarrierTechnologyParameters() instanceof RestServerCarrierTechnologyParameters)) {
final String errorMessage =
"specified producer properties are not applicable to REST Server producer (" + this.name + ")";
LOGGER.warn(errorMessage);
throw new ApexEventException(errorMessage);
}
// The REST carrier properties
RestServerCarrierTechnologyParameters restProducerProperties =
(RestServerCarrierTechnologyParameters) producerParameters.getCarrierTechnologyParameters();
// Check if host and port are defined
if (restProducerProperties.getHost() != null || restProducerProperties.getPort() != -1
|| restProducerProperties.isStandalone()) {
final String errorMessage =
"the parameters \"host\", \"port\", and \"standalone\" are illegal on REST Server producer ("
+ this.name + ")";
LOGGER.warn(errorMessage);
throw new ApexEventException(errorMessage);
}
// Check if we are in synchronous mode
if (!producerParameters.isPeeredMode(EventHandlerPeeredMode.SYNCHRONOUS)) {
final String errorMessage =
"REST Server producer (" + this.name + ") must run in synchronous mode with a REST Server consumer";
LOGGER.warn(errorMessage);
throw new ApexEventException(errorMessage);
}
}
/**
* {@inheritDoc}.
*/
@Override
public PeeredReference getPeeredReference(final EventHandlerPeeredMode peeredMode) {
return peerReferenceMap.get(peeredMode);
}
/**
* {@inheritDoc}.
*/
@Override
public void setPeeredReference(final EventHandlerPeeredMode peeredMode, final PeeredReference peeredReference) {
peerReferenceMap.put(peeredMode, peeredReference);
}
/**
* {@inheritDoc}.
*/
@Override
public void sendEvent(final long executionId, final Properties executionProperties, final String eventName,
final Object event) {
if (LOGGER.isDebugEnabled()) {
String message = name + ": event " + executionId + ':' + eventName + " recevied from Apex, event=" + event;
LOGGER.debug(message);
}
// If we are not synchronized, then exit
final SynchronousEventCache synchronousEventCache =
(SynchronousEventCache) peerReferenceMap.get(EventHandlerPeeredMode.SYNCHRONOUS);
if (synchronousEventCache == null) {
return;
}
// We see all events on the receiver, even those that are not replies to events sent by the synchronized
// consumer of this producer, ignore those
// events
if (!synchronousEventCache.existsEventToApex(executionId)) {
return;
}
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("{}: event {}:{} is a reply to a REST server call from {}",
name, executionId, eventName, name);
}
// Add the event to the received event cache
synchronousEventCache.cacheSynchronizedEventFromApex(executionId, event);
}
/**
* {@inheritDoc}.
*/
@Override
public void stop() {
// Implementation not required on this class
}
}
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