Initial messaging model for project 'smoke'

Not compiled yet as it is unused (without other patches).  I wanted
to start getting something committed so Derek and I can work together
on the next part.

Change-Id: I5dba6107e572c9be402d75df49c3c69e2c527590

1 files changed, 108 insertions, 0 deletions

diff --git a/WebKit/android/smoke/MessageThread.h b/WebKit/android/smoke/MessageThread.h
new file mode 100644
index 0000000..ca0115b
--- /dev/null
+++ b/WebKit/android/smoke/MessageThread.h
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2010, The Android Open Source Project
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ANDROID_WEBKIT_MESSAGETHREAD_H
+#define ANDROID_WEBKIT_MESSAGETHREAD_H
+
+#include <list>
+
+#include "MessageTypes.h"
+
+#include <utils/threads.h>
+
+using std::list;
+
+namespace android {
+
+class MessageQueue {
+public:
+    MessageQueue() {}
+
+    // Return true if the queue has messages with the given object and member
+    // function.  If member is null, return true if the message has the same
+    // object.
+    template <class T>
+    bool hasMessages(T* object, void (T::*member)(void));
+
+    // Remove all messages with the given object and member function.  If
+    // member is null, remove all messages with the given object.
+    template <class T>
+    void remove(T* object, void (T::*member)(void));
+
+    // Post a new message to the queue.
+    void post(Message* closure);
+
+    // Post a new message at the front of the queue.
+    void postAtFront(Message* closure);
+
+    // Obtain the next message.  Blocks until either a new message arrives or
+    // we reach the time of the next message.
+    Message* next();
+
+private:
+    bool hasMessages(const Message& message);
+    void remove(const Message& message);
+
+    list<Message*> m_messages;
+    Mutex          m_mutex;
+    Condition      m_condition;
+};
+
+template <class T>
+bool MessageQueue::hasMessages(T* object, void (T::*member)(void)) {
+    MemberFunctionMessage<T, void> message(object, member);
+    return hasMessages(message);
+}
+
+template <class T>
+void MessageQueue::remove(T* object, void (T::*member)(void)) {
+    MemberFunctionMessage<T, void> message(object, member);
+    remove(message);
+}
+
+class MessageThread : public Thread {
+public:
+    MessageQueue& queue() { return m_queue; }
+
+private:
+    MessageThread() : Thread(true /* canCallJava */) {}
+
+    virtual bool threadLoop();
+
+    MessageQueue m_queue;
+    // Used for thread initialization
+    Mutex m_mutex;
+    Condition m_condition;
+
+    friend MessageThread* messageThread();
+};
+
+// Get (possibly creating) the global MessageThread object used to pass
+// messages to WebCore.
+MessageThread* messageThread();
+
+}  // namespace android
+
+#endif  // ANDROID_WEBKIT_MESSAGETHREAD_H