Pull and merge from https://bitbucket.org/lindenlab/viewer-development.

1 files changed, 141 insertions, 0 deletions

diff --git a/indra/llcorehttp/_httprequestqueue.h b/indra/llcorehttp/_httprequestqueue.h
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+/**
+ * @file _httprequestqueue.h
+ * @brief Internal declaration for the operation request queue
+ *
+ * $LicenseInfo:firstyear=2012&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef	_LLCORE_HTTP_REQUEST_QUEUE_H_
+#define	_LLCORE_HTTP_REQUEST_QUEUE_H_
+
+
+#include <vector>
+
+#include "httpcommon.h"
+#include "_refcounted.h"
+#include "_mutex.h"
+
+
+namespace LLCore
+{
+
+
+class HttpOperation;
+
+
+/// Thread-safe queue of HttpOperation objects.  Just
+/// a simple queue that handles the transfer of operation
+/// requests from all HttpRequest instances into the
+/// singleton HttpService instance.
+
+class HttpRequestQueue : public LLCoreInt::RefCounted
+{
+protected:
+	/// Caller acquires a Refcount on construction
+	HttpRequestQueue();
+
+protected:
+	virtual ~HttpRequestQueue();						// Use release()
+
+private:
+	HttpRequestQueue(const HttpRequestQueue &);			// Not defined
+	void operator=(const HttpRequestQueue &);			// Not defined
+
+public:
+	static void init();
+	static void term();
+	
+	/// Threading:  callable by any thread once inited.
+	inline static HttpRequestQueue * instanceOf()
+		{
+			return sInstance;
+		}
+	
+public:
+	typedef std::vector<HttpOperation *> OpContainer;
+
+	/// Insert an object at the back of the request queue.
+	///
+	/// Caller must provide one refcount to the queue which takes
+	/// possession of the count on success.
+	///
+	/// @return			Standard status.  On failure, caller
+	///					must dispose of the operation with
+	///					an explicit release() call.
+	///
+	/// Threading:  callable by any thread.
+	HttpStatus addOp(HttpOperation * op);
+
+	/// Return the operation on the front of the queue.  If
+	/// the queue is empty and @wait is false, call returns
+	/// immediately and a NULL pointer is returned.  If true,
+	/// caller will sleep until explicitly woken.  Wakeups
+	/// can be spurious and callers must expect NULL pointers
+	/// even if waiting is indicated.
+	///
+	/// Caller acquires reference count any returned operation
+	///
+	/// Threading:  callable by any thread.
+	HttpOperation * fetchOp(bool wait);
+
+	/// Return all queued requests to caller.  The @ops argument
+	/// should be empty when called and will be swap()'d with
+	/// current contents.  Handling of the @wait argument is
+	/// identical to @fetchOp.
+	///
+	/// Caller acquires reference count on each returned operation
+	///
+	/// Threading:  callable by any thread.
+	void fetchAll(bool wait, OpContainer & ops);
+
+	/// Wake any sleeping threads.  Normal queuing operations
+	/// won't require this but it may be necessary for termination
+	/// requests.
+	///
+	/// Threading:  callable by any thread.
+	void wakeAll();
+
+	/// Disallow further request queuing.  Callers to @addOp will
+	/// get a failure status (LLCORE, HE_SHUTTING_DOWN).  Callers
+	/// to @fetchAll or @fetchOp will get requests that are on the
+	/// queue but the calls will no longer wait.  Instead they'll
+	/// return immediately.  Also wakes up all sleepers to send
+	/// them on their way.
+	///
+	/// Threading:  callable by any thread.
+	void stopQueue();
+	
+protected:
+	static HttpRequestQueue *			sInstance;
+	
+protected:
+	OpContainer							mQueue;
+	LLCoreInt::HttpMutex				mQueueMutex;
+	LLCoreInt::HttpConditionVariable	mQueueCV;
+	bool								mQueueStopped;
+	
+}; // end class HttpRequestQueue
+
+}  // end namespace LLCore
+
+
+#endif	// _LLCORE_HTTP_REQUEST_QUEUE_H_