* More work on asychronous network IO

* Fix of current EventQueue code to carry on compiling


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@552001 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 100 insertions, 0 deletions

diff --git a/cpp/src/qpid/sys/AsynchIO.h b/cpp/src/qpid/sys/AsynchIO.h
new file mode 100644
index 0000000000..b346c11706
--- /dev/null
+++ b/cpp/src/qpid/sys/AsynchIO.h
@@ -0,0 +1,100 @@
+#ifndef _sys_AsynchIO
+#define _sys_AsynchIO
+/*
+ *
+ * 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 "Dispatcher.h"
+
+#include <boost/function.hpp>
+#include <deque>
+
+namespace qpid {
+namespace sys {
+
+/*
+ * Asynchronous acceptor: accepts connections then does a callback with the
+ * accepted fd
+ */
+class AsynchAcceptor {
+public:
+    typedef boost::function1<void, int> Callback;
+
+private:
+    Callback acceptedCallback;
+    DispatchHandle handle;
+
+public:
+    AsynchAcceptor(int fd, Callback callback);
+    void start(Poller::shared_ptr poller);
+
+private:
+    void readable(DispatchHandle& handle);
+};
+
+/*
+ * Asycnchronous reader/writer: 
+ * Reader accepts buffers to read into; reads into the provided buffers
+ * and then does a callback with the buffer and amount read. Optionally it can callback
+ * when there is something to read but no buffer to read it into.
+ * 
+ * Writer accepts a buffer and queues it for writing; can also be given
+ * a callback for when writing is "idle" (ie fd is writable, but nothing to write)
+ */
+class AsynchIO {
+public:
+    struct Buffer {
+        char* const bytes;
+        const int32_t byteCount;
+        
+        Buffer(char* const b, const int32_t s) :
+            bytes(b),
+            byteCount(s)
+        {}
+    };
+
+    typedef boost::function2<void, const Buffer&, int32_t> ReadCallback;
+    typedef boost::function0<void> EofCallback;
+    typedef boost::function0<void> BuffersEmptyCallback;
+    typedef boost::function1<void, int> IdleCallback;
+
+private:
+    ReadCallback readCallback;
+    EofCallback eofCallback;
+    BuffersEmptyCallback emptyCallback;
+    IdleCallback idleCallback;
+    DispatchHandle handle;
+    std::deque<Buffer> bufferQueue;
+    std::deque<Buffer> writeQueue;
+
+public:
+    AsynchIO(int fd, ReadCallback rCb, EofCallback eofCb, BuffersEmptyCallback eCb = 0, IdleCallback iCb = 0);
+    void start(Poller::shared_ptr poller);
+    void QueueReadBuffer(const Buffer& buff);
+    void QueueWrite(const Buffer& buff);
+
+private:
+    void readable(DispatchHandle& handle);
+    void writeable(DispatchHandle& handle);
+};
+
+}}
+
+#endif // _sys_AsynchIO