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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.
#include "ppapi/proxy/plugin_resource_tracker.h"
#include "base/logging.h"
#include "base/memory/singleton.h"
#include "ppapi/proxy/plugin_dispatcher.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/proxy/plugin_resource.h"
#include "ppapi/proxy/serialized_var.h"
#include "ppapi/shared_impl/tracker_base.h"
namespace pp {
namespace proxy {
namespace {
// When non-NULL, this object overrides the ResourceTrackerSingleton.
PluginResourceTracker* g_resource_tracker_override = NULL;
::ppapi::shared_impl::TrackerBase* GetTrackerBase() {
return PluginResourceTracker::GetInstance();
}
} // namespace
PluginResourceTracker::ResourceInfo::ResourceInfo() : ref_count(0) {
}
PluginResourceTracker::ResourceInfo::ResourceInfo(int rc,
linked_ptr<PluginResource> r)
: ref_count(rc),
resource(r) {
}
PluginResourceTracker::ResourceInfo::ResourceInfo(const ResourceInfo& other)
: ref_count(other.ref_count),
resource(other.resource) {
// Wire up the new shared resource tracker base to use our implementation.
::ppapi::shared_impl::TrackerBase::Init(&GetTrackerBase);
}
PluginResourceTracker::ResourceInfo::~ResourceInfo() {
}
PluginResourceTracker::ResourceInfo&
PluginResourceTracker::ResourceInfo::operator=(
const ResourceInfo& other) {
ref_count = other.ref_count;
resource = other.resource;
return *this;
}
// Start counting resources at a high number to avoid collisions with vars (to
// help debugging).
PluginResourceTracker::PluginResourceTracker()
: last_resource_id_(0x00100000) {
}
PluginResourceTracker::~PluginResourceTracker() {
}
// static
void PluginResourceTracker::SetInstanceForTest(PluginResourceTracker* tracker) {
g_resource_tracker_override = tracker;
}
// static
PluginResourceTracker* PluginResourceTracker::GetInstance() {
if (g_resource_tracker_override)
return g_resource_tracker_override;
return Singleton<PluginResourceTracker>::get();
}
// static
::ppapi::shared_impl::TrackerBase*
PluginResourceTracker::GetTrackerBaseInstance() {
return GetInstance();
}
PluginResource* PluginResourceTracker::GetResourceObject(
PP_Resource pp_resource) {
ResourceMap::iterator found = resource_map_.find(pp_resource);
if (found == resource_map_.end())
return NULL;
return found->second.resource.get();
}
PP_Resource PluginResourceTracker::AddResource(
linked_ptr<PluginResource> object) {
if (object->host_resource().is_null()) {
// Prevent adding null resources or GetResourceObject(0) will return a
// valid pointer!
NOTREACHED();
return 0;
}
PP_Resource plugin_resource = ++last_resource_id_;
DCHECK(resource_map_.find(plugin_resource) == resource_map_.end());
resource_map_[plugin_resource] = ResourceInfo(1, object);
host_resource_map_[object->host_resource()] = plugin_resource;
return plugin_resource;
}
void PluginResourceTracker::AddRefResource(PP_Resource resource) {
ResourceMap::iterator found = resource_map_.find(resource);
if (found == resource_map_.end()) {
NOTREACHED();
return;
}
found->second.ref_count++;
}
void PluginResourceTracker::ReleaseResource(PP_Resource resource) {
ReleasePluginResourceRef(resource, true);
}
PP_Resource PluginResourceTracker::PluginResourceForHostResource(
const HostResource& resource) const {
HostResourceMap::const_iterator found = host_resource_map_.find(resource);
if (found == host_resource_map_.end())
return 0;
return found->second;
}
::ppapi::shared_impl::ResourceObjectBase* PluginResourceTracker::GetResourceAPI(
PP_Resource res) {
ResourceMap::iterator found = resource_map_.find(res);
if (found == resource_map_.end())
return NULL;
return found->second.resource.get();
}
::ppapi::shared_impl::FunctionGroupBase* PluginResourceTracker::GetFunctionAPI(
PP_Instance inst,
pp::proxy::InterfaceID id) {
PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(inst);
if (dispatcher)
return dispatcher->GetFunctionAPI(id);
return NULL;
}
void PluginResourceTracker::ReleasePluginResourceRef(
const PP_Resource& resource,
bool notify_browser_on_release) {
ResourceMap::iterator found = resource_map_.find(resource);
if (found == resource_map_.end())
return;
found->second.ref_count--;
if (found->second.ref_count == 0) {
// Keep a reference while removing in case the destructor ends up
// re-entering. That way, when the destructor is called, it's out of the
// maps.
linked_ptr<PluginResource> plugin_resource = found->second.resource;
PluginDispatcher* dispatcher =
PluginDispatcher::GetForInstance(plugin_resource->instance());
HostResource host_resource = plugin_resource->host_resource();
host_resource_map_.erase(host_resource);
resource_map_.erase(found);
plugin_resource.reset();
// dispatcher can be NULL if the plugin held on to a resource after the
// instance was destroyed. In that case the browser-side resource has
// already been freed correctly on the browser side.
if (notify_browser_on_release && dispatcher) {
dispatcher->Send(new PpapiHostMsg_PPBCore_ReleaseResource(
INTERFACE_ID_PPB_CORE, host_resource));
}
}
}
} // namespace proxy
} // namespace pp
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