1 files changed, 98 insertions, 0 deletions
diff --git a/jdisc_messagebus_service/src/main/java/com/yahoo/messagebus/shared/SharedIntermediateSession.java b/jdisc_messagebus_service/src/main/java/com/yahoo/messagebus/shared/SharedIntermediateSession.java
new file mode 100644
index 00000000000..0c90f602e44
--- /dev/null
+++ b/jdisc_messagebus_service/src/main/java/com/yahoo/messagebus/shared/SharedIntermediateSession.java
@@ -0,0 +1,98 @@
+// Copyright 2016 Yahoo Inc. 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 SharedIntermediateSession extends AbstractResource
+        implements ClientSession, ServerSession, MessageHandler, ReplyHandler
+{
+
+    private static final Logger log = Logger.getLogger(SharedIntermediateSession.class.getName());
+    private final AtomicReference<MessageHandler> msgHandler = new AtomicReference<>();
+    private final SharedMessageBus mbus;
+    private final IntermediateSession session;
+    private final ResourceReference mbusReference;
+
+    public SharedIntermediateSession(SharedMessageBus mbus, IntermediateSessionParams params) {
+        if (params.getReplyHandler() != null) {
+            throw new IllegalArgumentException("Reply handler must be null.");
+        }
+        this.mbus = mbus;
+        this.msgHandler.set(params.getMessageHandler());
+        this.session = mbus.messageBus().createIntermediateSession(params.setReplyHandler(this)
+                                                                         .setMessageHandler(this));
+        this.mbusReference = mbus.refer();
+    }
+
+    public IntermediateSession session() {
+        return session;
+    }
+
+    @Override
+    public Result sendMessage(Message msg) {
+        session.forward(msg);
+        return Result.ACCEPTED;
+    }
+
+    @Override
+    public void sendReply(Reply reply) {
+        session.forward(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 void handleReply(Reply reply) {
+        reply.popHandler().handleReply(reply);
+    }
+
+    @Override
+    public String connectionSpec() {
+        return session.getConnectionSpec();
+    }
+
+    @Override
+    public String name() {
+        return session.getName();
+    }
+
+    @Override
+    protected void destroy() {
+        log.log(LogLevel.DEBUG, "Destroying shared intermediate session.");
+        session.destroy();
+        mbusReference.close();
+    }
+}