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// Copyright (c) 2010 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_PLUGIN_RESOURCE_TRACKER_H_
#define PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_
#include <map>
#include "base/linked_ptr.h"
#include "ppapi/c/pp_completion_callback.h"
#include "ppapi/c/pp_stdint.h"
#include "ppapi/c/pp_resource.h"
#include "ppapi/c/pp_var.h"
namespace pp {
namespace proxy {
class PluginDispatcher;
class PluginResource;
class PluginResourceTracker {
public:
PluginResourceTracker(PluginDispatcher* dispatcher);
~PluginResourceTracker();
// Returns the object associated with the given resource ID, or NULL if
// there isn't one.
PluginResource* GetResourceObject(PP_Resource pp_resource);
void AddResource(PP_Resource pp_resource, linked_ptr<PluginResource> object);
void AddRefResource(PP_Resource resource);
void ReleaseResource(PP_Resource resource);
// Checks if the resource just returned from the renderer is already
// tracked by the plugin side and adjusts the refcounts if so.
//
// When the browser returns a PP_Resource, it could be a new one, in which
// case the proxy wants to create a corresponding object and call
// AddResource() on it. However, if the resouce is already known, then the
// refcount needs to be adjusted in both the plugin and the renderer side
// and no such object needs to be created.
//
// Returns true if the resource was previously known. The refcount will be
// fixed up such that it's ready to use by the plugin. A proxy can then
// just return the resource without doing any more work.
//
// Typical usage:
//
// PP_Resource result;
// dispatcher->Send(new MyMessage(..., &result));
// if (dispatcher->plugin_resource_tracker()->
// PreparePreviouslyTrackedResource(result))
// return result;
// ... create resource object ...
// dispatcher->plugin_resource_tracker()->AddResource(result, object);
// return result;
bool PreparePreviouslyTrackedResource(PP_Resource resource);
private:
struct ResourceInfo {
ResourceInfo();
ResourceInfo(int ref_count, linked_ptr<PluginResource> r);
ResourceInfo(const ResourceInfo& other);
~ResourceInfo();
ResourceInfo& operator=(const ResourceInfo& other);
int ref_count;
linked_ptr<PluginResource> resource; // May be NULL.
};
void ReleasePluginResourceRef(const PP_Resource& var,
bool notify_browser_on_release);
// Pointer to the dispatcher that owns us.
PluginDispatcher* dispatcher_;
typedef std::map<PP_Resource, ResourceInfo> ResourceMap;
ResourceMap resource_map_;
};
} // namespace proxy
} // namespace pp
#endif // PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_