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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_PROXY_RESOURCE_REPLY_THREAD_REGISTRAR_H_
#define PPAPI_PROXY_RESOURCE_REPLY_THREAD_REGISTRAR_H_
#include <map>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "ppapi/c/pp_resource.h"
#include "ppapi/proxy/ppapi_proxy_export.h"
namespace base {
class MessageLoopProxy;
}
namespace ppapi {
class TrackedCallback;
namespace proxy {
// ResourceReplyThreadRegistrar records the handling thread for
// PpapiPluginMsg_ResourceReply messages.
// This class is thread safe.
class PPAPI_PROXY_EXPORT ResourceReplyThreadRegistrar
: public base::RefCountedThreadSafe<ResourceReplyThreadRegistrar> {
public:
explicit ResourceReplyThreadRegistrar(
scoped_refptr<base::MessageLoopProxy> default_thread);
// This method can only be called while holding the Pepper proxy lock; the
// other methods can be called with/without the Pepper proxy lock.
void Register(PP_Resource resource,
int32_t sequence_number,
scoped_refptr<TrackedCallback> reply_thread_hint);
void Unregister(PP_Resource resource);
scoped_refptr<base::MessageLoopProxy> GetTargetThreadAndUnregister(
PP_Resource resource,
int32_t sequence_number);
private:
friend class base::RefCountedThreadSafe<ResourceReplyThreadRegistrar>;
typedef std::map<int32_t, scoped_refptr<base::MessageLoopProxy> >
SequenceNumberMap;
typedef std::map<PP_Resource, SequenceNumberMap> ResourceMap;
~ResourceReplyThreadRegistrar();
// The lock that protects the data members below.
// Please note that we should never try to acquire the Pepper proxy lock while
// holding |lock_|, otherwise we will cause deadlock.
base::Lock lock_;
ResourceMap map_;
scoped_refptr<base::MessageLoopProxy> default_thread_;
DISALLOW_COPY_AND_ASSIGN(ResourceReplyThreadRegistrar);
};
} // namespace proxy
} // namespace ppapi
#endif // PPAPI_PROXY_RESOURCE_REPLY_THREAD_REGISTRAR_H_
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