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// Copyright (c) 2012 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 <vector>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "ppapi/c/pp_resource.h"
#include "ppapi/host/ppapi_host_export.h"
#include "ppapi/host/resource_message_handler.h"
#include "ppapi/shared_impl/host_resource.h"
namespace IPC {
class Message;
namespace ppapi {
namespace host {
struct HostMessageContext;
class PpapiHost;
class ResourceMessageFilter;
// Some (but not all) resources have a corresponding object in the host side
// that is kept alive as long as the resource in the plugin is alive. This is
// the base class for such objects.
class PPAPI_HOST_EXPORT ResourceHost : public ResourceMessageHandler {
ResourceHost(PpapiHost* host, PP_Instance instance, PP_Resource resource);
~ResourceHost() override;
PpapiHost* host() { return host_; }
PP_Instance pp_instance() const { return pp_instance_; }
PP_Resource pp_resource() const { return pp_resource_; }
// This runs any message filters in |message_filters_|. If the message is not
// handled by these filters then the host's own message handler is run. True
// is always returned (the message will always be handled in some way).
bool HandleMessage(const IPC::Message& msg,
HostMessageContext* context) override;
// Sets the PP_Resource ID when the plugin attaches to a pending resource
// host. This will notify subclasses by calling
// DidConnectPendingHostToResource.
// The current PP_Resource for all pending hosts should be 0. See
// PpapiHostMsg_AttachToPendingHost.
void SetPPResourceForPendingHost(PP_Resource pp_resource);
void SendReply(const ReplyMessageContext& context,
const IPC::Message& msg) override;
// Simple RTTI. A subclass that is a host for one of these APIs will override
// the appropriate function and return true.
virtual bool IsFileRefHost();
virtual bool IsFileSystemHost();
virtual bool IsGraphics2DHost();
virtual bool IsMediaStreamVideoTrackHost();
// Adds a ResourceMessageFilter to handle resource messages. Incoming
// messages will be passed to the handlers of these filters before being
// handled by the resource host's own message handler. This allows
// ResourceHosts to easily handle messages on other threads.
void AddFilter(scoped_refptr<ResourceMessageFilter> filter);
// Called when this resource host is pending and the corresponding plugin has
// just connected to it. The host resource subclass can implement this
// function if it wants to do processing (typically sending queued data).
// The PP_Resource will be valid for this call but not before.
virtual void DidConnectPendingHostToResource() {}
// The host that owns this object.
PpapiHost* host_;
PP_Instance pp_instance_;
PP_Resource pp_resource_;
// A vector of message filters which the host will forward incoming resource
// messages to.
std::vector<scoped_refptr<ResourceMessageFilter> > message_filters_;
} // namespace host
} // namespace ppapi