1 files changed, 85 insertions, 0 deletions
diff --git a/container-messagebus/src/main/java/com/yahoo/messagebus/shared/SharedDestinationSession.java b/container-messagebus/src/main/java/com/yahoo/messagebus/shared/SharedDestinationSession.java
new file mode 100644
index 00000000000..7da164757cd
--- /dev/null
+++ b/container-messagebus/src/main/java/com/yahoo/messagebus/shared/SharedDestinationSession.java
@@ -0,0 +1,85 @@
+// 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 java.util.logging.Level;
+import com.yahoo.messagebus.DestinationSession;
+import com.yahoo.messagebus.DestinationSessionParams;
+import com.yahoo.messagebus.EmptyReply;
+import com.yahoo.messagebus.Error;
+import com.yahoo.messagebus.ErrorCode;
+import com.yahoo.messagebus.Message;
+import com.yahoo.messagebus.MessageHandler;
+import com.yahoo.messagebus.Reply;
+
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.logging.Logger;
+
+/**
+ * @author Simon Thoresen Hult
+ */
+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 DestinationSession session;
+    private final ResourceReference mbusReference;
+
+    SharedDestinationSession(SharedMessageBus mbus, DestinationSessionParams params) {
+        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(Level.FINE, "Destroying shared destination session.");
+        session.destroy();
+        mbusReference.close();
+    }
+}