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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.
#ifndef PPAPI_HOST_HOST_MESSAGE_CONTEXT_H_
#define PPAPI_HOST_HOST_MESSAGE_CONTEXT_H_
#include "ipc/ipc_message.h"
#include "ppapi/host/ppapi_host_export.h"
#include "ppapi/proxy/resource_message_params.h"
namespace ppapi {
namespace host {
// This context structure provides information about outgoing resource message
// replies.
struct PPAPI_HOST_EXPORT ReplyMessageContext {
ReplyMessageContext();
ReplyMessageContext(
const ppapi::proxy::ResourceMessageReplyParams& cp,
IPC::Message* sync_reply_msg,
int routing_id);
~ReplyMessageContext();
// Returns a value indicating whether this context is valid or "null".
bool is_valid() const { return params.pp_resource() != 0; }
// The "reply params" struct with the same resource and sequence number
// as the original resource message call.
ppapi::proxy::ResourceMessageReplyParams params;
// If this context is generated from a sync message, this will be set to the
// incoming sync message. Otherwise, it will be NULL. The plugin controls
// whether or not the resource call is synchronous or asynchronous so a
// ResoureHost cannot make any assumptions about whether or not this is NULL.
IPC::Message* sync_reply_msg;
// Routing ID to be used when sending a reply message. This is only useful
// when the plugin is in-process. Otherwise, the value will be
// MSG_ROUTING_NONE.
int routing_id;
};
// This context structure provides information about incoming resource message
// call requests when passed to resources.
struct PPAPI_HOST_EXPORT HostMessageContext {
explicit HostMessageContext(
const ppapi::proxy::ResourceMessageCallParams& cp);
HostMessageContext(
int routing_id,
const ppapi::proxy::ResourceMessageCallParams& cp);
HostMessageContext(
const ppapi::proxy::ResourceMessageCallParams& cp,
IPC::Message* sync_reply_msg);
~HostMessageContext();
// Returns a reply message context struct which includes the reply params.
ReplyMessageContext MakeReplyMessageContext() const;
// The original call parameters passed to the resource message call. This
// cannot be a reference because this object may be passed to another thread.
ppapi::proxy::ResourceMessageCallParams params;
// The reply message. If the params has the callback flag set, this message
// will be sent in reply. It is initialized to the empty message. If the
// handler wants to send something else, it should just assign the message
// it wants to this value.
IPC::Message reply_msg;
// If this context is generated from a sync message, this will be set to the
// incoming sync message. Otherwise, it will be NULL.
IPC::Message* sync_reply_msg;
// Routing ID to be used when sending a reply message. This is only useful
// when the plugin is in-process. Otherwise, the value will be
// MSG_ROUTING_NONE.
int routing_id;
};
} // namespace host
} // namespace ppapi
#endif // PPAPI_HOST_HOST_MESSAGE_CONTEXT_H_
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