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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.core.infrastructure.messaging.stringmessaging;
import com.google.common.eventbus.Subscribe;
import java.net.URI;
import org.onap.policy.apex.core.infrastructure.messaging.MessageListener;
import org.onap.policy.apex.core.infrastructure.messaging.MessagingException;
import org.onap.policy.apex.core.infrastructure.messaging.MessagingService;
import org.onap.policy.apex.core.infrastructure.messaging.MessagingServiceFactory;
import org.onap.policy.apex.core.infrastructure.messaging.impl.ws.messageblock.MessageBlock;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLoggerFactory;
/**
* This class uses a web socket client to send and receive strings over a web socket.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class WsStringMessageClient implements WsStringMessager {
private static final XLogger LOGGER = XLoggerFactory.getXLogger(WsStringMessageClient.class);
// Repeated string constants
private static final String MESSAGE_PREAMBLE = "web socket event consumer client to \"";
// Message service factory and the message service itself
private final MessagingServiceFactory<String> factory = new MessagingServiceFactory<>();
private MessagingService<String> service = null;
// The listener to use for reception of strings
private WsStringMessageListener wsStringMessageListener;
// Address of the server
private final String host;
private final int port;
private String uriString;
/**
* Constructor, define the host and port of the server to connect to.
*
* @param host the host of the server
* @param port the port of the server
*/
public WsStringMessageClient(final String host, final int port) {
this.host = host;
this.port = port;
}
/**
* {@inheritDoc}.
*/
@Override
public void start(final WsStringMessageListener newWsStringMessageListener) throws MessagingException {
this.wsStringMessageListener = newWsStringMessageListener;
uriString = "ws://" + host + ":" + port;
String messagePreamble = MESSAGE_PREAMBLE + uriString + "\" ";
LOGGER.entry(messagePreamble + "starting . . .");
try {
service = factory.createClient(new URI(uriString));
service.addMessageListener(new WsStringMessageClientListener());
service.startConnection();
} catch (final Exception e) {
String message = messagePreamble + "start failed";
LOGGER.warn(message, e);
throw new MessagingException(message, e);
}
LOGGER.exit(messagePreamble + "started");
}
/**
* {@inheritDoc}.
*/
@Override
public void stop() {
LOGGER.entry(MESSAGE_PREAMBLE + uriString + "\" stopping . . .");
service.stopConnection();
LOGGER.exit(MESSAGE_PREAMBLE + uriString + "\" stopped");
}
/**
* {@inheritDoc}.
*/
@Override
public void sendString(final String stringMessage) {
service.send(stringMessage);
if (LOGGER.isDebugEnabled()) {
String message = "message sent to server: " + stringMessage;
LOGGER.debug(message);
}
}
/**
* The Class WSStringMessageClientListener.
*/
private class WsStringMessageClientListener implements MessageListener<String> {
/**
* {@inheritDoc}.
*/
@Subscribe
@Override
public void onMessage(final MessageBlock<String> messageBlock) {
throw new UnsupportedOperationException("raw messages are not supported on string message clients");
}
/**
* {@inheritDoc}.
*/
@Subscribe
@Override
public void onMessage(final String messageString) {
wsStringMessageListener.receiveString(messageString);
}
}
/**
* {@inheritDoc}.
*/
@Override
public boolean isStarted() {
return service.isStarted();
}
}
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