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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2020 Nordix Foundation.
* ================================================================================
* 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.websocket;
import java.util.Properties;
import org.onap.policy.apex.core.infrastructure.messaging.MessagingException;
import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WsStringMessageClient;
import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WsStringMessageListener;
import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WsStringMessageServer;
import org.onap.policy.apex.core.infrastructure.messaging.stringmessaging.WsStringMessager;
import org.onap.policy.apex.service.engine.event.ApexEventException;
import org.onap.policy.apex.service.engine.event.ApexPluginsEventProducer;
import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Concrete implementation of an Apex event producer that sends events using a web socket.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class ApexWebSocketProducer extends ApexPluginsEventProducer implements WsStringMessageListener {
// Get a reference to the logger
private static final Logger LOGGER = LoggerFactory.getLogger(ApexWebSocketProducer.class);
// The web socket messager, may be WS a server or a client
private WsStringMessager wsStringMessager;
@Override
public void init(final String producerName, final EventHandlerParameters producerParameters)
throws ApexEventException {
this.name = producerName;
// Check and get the web socket Properties
if (!(producerParameters.getCarrierTechnologyParameters() instanceof WebSocketCarrierTechnologyParameters)) {
String message =
"specified producer properties for " + this.name + "are not applicable to a web socket producer";
LOGGER.warn(message);
throw new ApexEventException("specified producer properties are not applicable to a web socket producer");
}
// The Web Socket properties
WebSocketCarrierTechnologyParameters webSocketProducerProperties =
(WebSocketCarrierTechnologyParameters) producerParameters.getCarrierTechnologyParameters();
// Check if this is a server or a client Web Socket
if (webSocketProducerProperties.isWsClient()) {
// Create a WS client
wsStringMessager = new WsStringMessageClient(webSocketProducerProperties.getHost(),
webSocketProducerProperties.getPort());
} else {
wsStringMessager = new WsStringMessageServer(webSocketProducerProperties.getPort());
}
// Start reception of event strings on the web socket
try {
wsStringMessager.start(this);
} catch (final MessagingException e) {
String message = "could not start web socket producer (" + this.name + ")";
LOGGER.warn(message, e);
}
}
/**
* {@inheritDoc}.
*/
@Override
public void sendEvent(final long executionId, final Properties executionProperties, final String eventName,
final Object event) {
super.sendEvent(executionId, executionProperties, eventName, event);
wsStringMessager.sendString((String) event);
}
/**
* {@inheritDoc}.
*/
@Override
public void stop() {
if (wsStringMessager != null) {
wsStringMessager.stop();
}
}
/**
* {@inheritDoc}.
*/
@Override
public void receiveString(final String messageString) {
String message = "received message \"" + messageString + "\" on web socket producer (" + this.name
+ ") , no messages should be received on a web socket producer";
LOGGER.warn(message);
}
}
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