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

1 files changed, 161 insertions, 0 deletions

diff --git a/indra/llcorehttp/_httppolicy.h b/indra/llcorehttp/_httppolicy.h
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+/**
+ * @file _httppolicy.h
+ * @brief Declarations for internal class enforcing policy decisions.
+ *
+ * $LicenseInfo:firstyear=2012&license=viewerlgpl$
+ * 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_POLICY_H_
+#define	_LLCORE_HTTP_POLICY_H_
+
+
+#include "httprequest.h"
+#include "_httpservice.h"
+#include "_httpreadyqueue.h"
+#include "_httpretryqueue.h"
+#include "_httppolicyglobal.h"
+#include "_httppolicyclass.h"
+#include "_httpinternal.h"
+
+
+namespace LLCore
+{
+
+class HttpReadyQueue;
+class HttpOpRequest;
+
+
+/// Implements class-based queuing policies for an HttpService instance.
+///
+/// Threading:  Single-threaded.  Other than for construction/destruction,
+/// all methods are expected to be invoked in a single thread, typically
+/// a worker thread of some sort.
+class HttpPolicy
+{
+public:
+	HttpPolicy(HttpService *);
+	virtual ~HttpPolicy();
+
+private:
+	HttpPolicy(const HttpPolicy &);				// Not defined
+	void operator=(const HttpPolicy &);			// Not defined
+
+public:
+	/// Cancel all ready and retry requests sending them to
+	/// their notification queues.  Release state resources
+	/// making further request handling impossible.
+	///
+	/// Threading:  called by worker thread
+	void shutdown();
+
+	/// Deliver policy definitions and enable handling of
+	/// requests.  One-time call invoked before starting
+	/// the worker thread.
+	///
+	/// Threading:  called by application thread
+	void start(const HttpPolicyGlobal & global,
+			   const std::vector<HttpPolicyClass> & classes);
+
+	/// Give the policy layer some cycles to scan the ready
+	/// queue promoting higher-priority requests to active
+	/// as permited.
+	///
+	/// @return			Indication of how soon this method
+	///					should be called again.
+	///
+	/// Threading:  called by worker thread
+	HttpService::ELoopSpeed processReadyQueue();
+
+	/// Add request to a ready queue.  Caller is expected to have
+	/// provided us with a reference count to hold the request.  (No
+	/// additional references will be added.)
+	///
+	/// OpRequest is owned by the request queue after this call
+	/// and should not be modified by anyone until retrieved
+	/// from queue.
+	///
+	/// Threading:  called by any thread
+	void addOp(HttpOpRequest *);
+
+	/// Similar to addOp, used when a caller wants to retry a
+	/// request that has failed.  It's placed on a special retry
+	/// queue but ordered by retry time not priority.  Otherwise,
+	/// handling is the same and retried operations are considered
+	/// before new ones but that doesn't guarantee completion
+	/// order.
+	///
+	/// Threading:  called by worker thread
+	void retryOp(HttpOpRequest *);
+
+	/// Attempt to change the priority of an earlier request.
+	/// Request that Shadows HttpService's method
+	///
+	/// Threading:  called by worker thread
+	bool changePriority(HttpHandle handle, HttpRequest::priority_t priority);
+
+	/// Attempt to cancel a previous request.
+	/// Shadows HttpService's method as well
+	///
+	/// Threading:  called by worker thread
+	bool cancel(HttpHandle handle);
+
+	/// When transport is finished with an op and takes it off the
+	/// active queue, it is delivered here for dispatch.  Policy
+	/// may send it back to the ready/retry queues if it needs another
+	/// go or we may finalize it and send it on to the reply queue.
+	///
+	/// @return			Returns true of the request is still active
+	///					or ready after staging, false if has been
+	///					sent on to the reply queue.
+	///
+	/// Threading:  called by worker thread
+	bool stageAfterCompletion(HttpOpRequest * op);
+	
+	// Get pointer to global policy options.  Caller is expected
+	// to do context checks like no setting once running.
+	///
+	/// Threading:  called by any thread *but* the object may
+	/// only be modified by the worker thread once running.
+	///
+	HttpPolicyGlobal & getGlobalOptions()
+		{
+			return mGlobalOptions;
+		}
+
+	/// Get ready counts for a particular policy class
+	///
+	/// Threading:  called by worker thread
+	int getReadyCount(HttpRequest::policy_t policy_class) const;
+	
+protected:
+	struct State;
+
+	int									mActiveClasses;
+	State *								mState;
+	HttpService *						mService;				// Naked pointer, not refcounted, not owner
+	HttpPolicyGlobal					mGlobalOptions;
+	
+};  // end class HttpPolicy
+
+}  // end namespace LLCore
+
+#endif // _LLCORE_HTTP_POLICY_H_