1 files changed, 95 insertions, 0 deletions
diff --git a/Final/cpp/lib/common/sys/posix/EventChannelThreads.h b/Final/cpp/lib/common/sys/posix/EventChannelThreads.h
new file mode 100644
index 0000000000..e28190e0ed
--- /dev/null
+++ b/Final/cpp/lib/common/sys/posix/EventChannelThreads.h
@@ -0,0 +1,95 @@
+#ifndef _posix_EventChannelThreads_h
+#define _sys_EventChannelThreads_h
+
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ *
+ */
+#include <vector>
+
+#include <Exception.h>
+#include <sys/Time.h>
+#include <sys/Monitor.h>
+#include <sys/Thread.h>
+#include <sys/AtomicCount.h>
+#include "EventChannel.h"
+
+namespace qpid {
+namespace sys {
+
+/**
+   Dynamic thread pool serving an EventChannel.
+
+   Threads run a loop { e = getEvent(); e->dispatch(); }
+   The size of the thread pool is automatically adjusted to optimal size.
+*/
+class EventChannelThreads :
+        public qpid::SharedObject<EventChannelThreads>,
+        public sys::Monitor, private sys::Runnable
+{
+  public:
+    /** Create the thread pool and start initial threads. */
+    static EventChannelThreads::shared_ptr create(
+        EventChannel::shared_ptr channel
+    );
+
+    ~EventChannelThreads();
+
+    /** Post event to the underlying channel */
+    void postEvent(Event& event) { channel->postEvent(event); }
+
+    /** Post event to the underlying channel Must not be 0. */
+    void postEvent(Event* event) { channel->postEvent(event); }
+
+    /**
+     * Terminate all threads.
+     *
+     * Returns immediately, use join() to wait till all threads are
+     * shut down. 
+     */
+    void shutdown();
+    
+    /** Wait for all threads to terminate. */
+    void join();
+
+  private:
+    typedef std::vector<sys::Thread> Threads;
+    typedef enum {
+        RUNNING, TERMINATE_SENT, JOINING, SHUTDOWN
+    } State;
+
+    EventChannelThreads(EventChannel::shared_ptr underlyingChannel);
+    void addThread();
+
+    void run();
+    bool keepRunning();
+    void adjustThreads();
+
+    EventChannel::shared_ptr channel;
+    Threads workers;
+    sys::AtomicCount nWaiting;
+    State state;
+    Event terminate;
+};
+
+
+}}
+
+
+#endif  /*!_sys_EventChannelThreads_h*/