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// Copyright (c) 2011 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_VAR_TRACKER_H_
#define PPAPI_PROXY_PLUGIN_VAR_TRACKER_H_
#include <map>
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "ppapi/c/pp_stdint.h"
#include "ppapi/c/pp_var.h"
#include "ppapi/proxy/ppapi_proxy_export.h"
#include "ppapi/shared_impl/var_tracker.h"
template<typename T> struct DefaultSingletonTraits;
namespace ppapi {
class ProxyObjectVar;
namespace proxy {
class PluginDispatcher;
// Tracks live strings and objects in the plugin process.
class PPAPI_PROXY_EXPORT PluginVarTracker : public VarTracker {
public:
PluginVarTracker();
~PluginVarTracker();
// Manages tracking for receiving a VARTYPE_OBJECT from the remote side
// (either the plugin or the renderer) that has already had its reference
// count incremented on behalf of the caller.
PP_Var ReceiveObjectPassRef(const PP_Var& var, PluginDispatcher* dispatcher);
// See the comment in var_tracker.h for more about what a tracked object is.
// This adds and releases the "track_with_no_reference_count" for a given
// object.
PP_Var TrackObjectWithNoReference(const PP_Var& host_var,
PluginDispatcher* dispatcher);
void StopTrackingObjectWithNoReference(const PP_Var& plugin_var);
// Returns the host var for the corresponding plugin object var. The object
// should be a VARTYPE_OBJECT. The reference count is not affeceted.
PP_Var GetHostObject(const PP_Var& plugin_object) const;
PluginDispatcher* DispatcherForPluginObject(
const PP_Var& plugin_object) const;
// Like Release() but the var is identified by its host object ID (as
// returned by GetHostObject).
void ReleaseHostObject(PluginDispatcher* dispatcher,
const PP_Var& host_object);
// Retrieves the internal reference counts for testing. Returns 0 if we
// know about the object but the corresponding value is 0, or -1 if the
// given object ID isn't in our map.
int GetRefCountForObject(const PP_Var& plugin_object);
int GetTrackedWithNoReferenceCountForObject(const PP_Var& plugin_object);
private:
// VarTracker protected overrides.
virtual int32 AddVarInternal(Var* var, AddVarRefMode mode) OVERRIDE;
virtual void TrackedObjectGettingOneRef(VarMap::const_iterator iter) OVERRIDE;
virtual void ObjectGettingZeroRef(VarMap::iterator iter) OVERRIDE;
virtual bool DeleteObjectInfoIfNecessary(VarMap::iterator iter) OVERRIDE;
virtual ArrayBufferVar* CreateArrayBuffer(uint32 size_in_bytes) OVERRIDE;
private:
friend struct DefaultSingletonTraits<PluginVarTracker>;
friend class PluginProxyTestHarness;
// Represents a var as received from the host.
struct HostVar {
HostVar(PluginDispatcher* d, int32 i);
bool operator<(const HostVar& other) const;
// The dispatcher that sent us this object. This is used so we know how to
// send back requests on this object.
PluginDispatcher* dispatcher;
// The object ID that the host generated to identify the object. This is
// unique only within that host: different hosts could give us different
// objects with the same ID.
int32 host_object_id;
};
// Returns the existing var ID for the given object var, creating and
// assigning an ID to it if necessary. This does not affect the reference
// count, so in the creation case the refcount will be 0. It's assumed in
// this case the caller will either adjust the refcount or the
// track_with_no_reference_count.
PP_Var GetOrCreateObjectVarID(ProxyObjectVar* object);
// Sends an addref or release message to the browser for the given object ID.
void SendAddRefObjectMsg(const ProxyObjectVar& proxy_object);
void SendReleaseObjectMsg(const ProxyObjectVar& proxy_object);
// Looks up the given host var. If we already know about it, returns a
// reference to the already-tracked object. If it doesn't creates a new one
// and returns it. If it's created, it's not added to the map.
scoped_refptr<ProxyObjectVar> FindOrMakePluginVarFromHostVar(
const PP_Var& var,
PluginDispatcher* dispatcher);
// Maps host vars in the host to IDs in the plugin process.
typedef std::map<HostVar, int32> HostVarToPluginVarMap;
HostVarToPluginVarMap host_var_to_plugin_var_;
DISALLOW_COPY_AND_ASSIGN(PluginVarTracker);
};
} // namespace proxy
} // namespace ppapi
#endif // PPAPI_PROXY_PLUGIN_VAR_TRACKER_H_
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