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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.messagebus.shared;
import com.yahoo.jdisc.AbstractResource;
import com.yahoo.jdisc.ResourceReference;
import com.yahoo.log.LogLevel;
import com.yahoo.messagebus.*;
import com.yahoo.messagebus.Error;
import java.util.concurrent.atomic.AtomicReference;
import java.util.logging.Logger;
/**
* @author <a href="mailto:simon@yahoo-inc.com">Simon Thoresen</a>
*/
public class SharedDestinationSession extends AbstractResource implements MessageHandler, ServerSession {
private static final Logger log = Logger.getLogger(SharedDestinationSession.class.getName());
private final AtomicReference<MessageHandler> msgHandler = new AtomicReference<>();
private final SharedMessageBus mbus;
private final DestinationSession session;
private final ResourceReference mbusReference;
public SharedDestinationSession(SharedMessageBus mbus, DestinationSessionParams params) {
this.mbus = mbus;
this.msgHandler.set(params.getMessageHandler());
this.session = mbus.messageBus().createDestinationSession(params.setMessageHandler(this));
this.mbusReference = mbus.refer();
}
public DestinationSession session() {
return session;
}
@Override
public void sendReply(Reply reply) {
session.reply(reply);
}
@Override
public MessageHandler getMessageHandler() {
return msgHandler.get();
}
@Override
public void setMessageHandler(MessageHandler msgHandler) {
if (!this.msgHandler.compareAndSet(null, msgHandler)) {
throw new IllegalStateException("Message handler already registered.");
}
}
@Override
public void handleMessage(Message msg) {
MessageHandler msgHandler = this.msgHandler.get();
if (msgHandler == null) {
Reply reply = new EmptyReply();
reply.swapState(msg);
reply.addError(new Error(ErrorCode.SESSION_BUSY, "Session not fully configured yet."));
sendReply(reply);
return;
}
msgHandler.handleMessage(msg);
}
@Override
public String connectionSpec() {
return session.getConnectionSpec();
}
@Override
public String name() {
return session.getName();
}
@Override
protected void destroy() {
log.log(LogLevel.DEBUG, "Destroying shared destination session.");
session.destroy();
mbusReference.close();
}
}
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