OpenDaylight Controller functional modules.

[controller.git] / opendaylight / protocol_plugins / openflow / src / main / java / org / opendaylight / controller / protocol_plugin / openflow / core / internal / SynchronousMessage.java

diff --git a/opendaylight/protocol_plugins/openflow/src/main/java/org/opendaylight/controller/protocol_plugin/openflow/core/internal/SynchronousMessage.java b/opendaylight/protocol_plugins/openflow/src/main/java/org/opendaylight/controller/protocol_plugin/openflow/core/internal/SynchronousMessage.java
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+
+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+
+package org.opendaylight.controller.protocol_plugin.openflow.core.internal;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.CountDownLatch;
+
+import org.opendaylight.controller.protocol_plugin.openflow.core.ISwitch;
+import org.openflow.protocol.OFBarrierRequest;
+import org.openflow.protocol.OFError;
+import org.openflow.protocol.OFMessage;
+
+/**
+ * Implements the synchronous message send to a switch
+ * It sends the requested message to the switch followed by a barrier request message
+ * It returns the result once it gets the reply from the switch or after a timeout
+ * If the protocol does not dictate the switch to reply the processing status for a particular message
+ * the barrier request forces the switch to reply saying whether or not the message processing was
+ * successful for messages sent to the switch up to this point
+ *
+ *
+ *
+ */
+public class SynchronousMessage implements Callable<Object> {
+    private ISwitch sw;
+    private Integer xid;
+    private OFMessage syncMsg;
+    protected CountDownLatch latch;
+    private Object result;
+
+    public SynchronousMessage(ISwitch sw, Integer xid, OFMessage msg) {
+        this.sw = sw;
+        this.xid = xid;
+        syncMsg = msg;
+        latch = new CountDownLatch(1);
+        result = null;
+    }
+
+    @Override
+    public Object call() throws Exception {
+        sw.asyncSend(syncMsg, xid);
+        OFBarrierRequest barrierMsg = new OFBarrierRequest();
+        sw.asyncSend(barrierMsg, xid);
+        latch.await();
+        return result;
+    }
+
+    public Integer getXid() {
+        return this.xid;
+    }
+
+    public void wakeup() {
+        this.latch.countDown();
+    }
+
+    public void wakeup(OFError e) {
+        result = e;
+        wakeup();
+    }
+
+}
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