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// Copyright 2013 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 "mojo/system/proxy_message_pipe_endpoint.h"
#include <string.h>
#include "base/containers/hash_tables.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "mojo/system/channel.h"
#include "mojo/system/message_pipe_dispatcher.h"
namespace mojo {
namespace system {
ProxyMessagePipeEndpoint::ProxyMessagePipeEndpoint()
: local_id_(MessageInTransit::kInvalidEndpointId),
remote_id_(MessageInTransit::kInvalidEndpointId),
is_open_(true),
is_peer_open_(true) {
}
ProxyMessagePipeEndpoint::~ProxyMessagePipeEndpoint() {
DCHECK(!is_running());
DCHECK(!is_attached());
AssertConsistentState();
DCHECK(paused_message_queue_.empty());
}
void ProxyMessagePipeEndpoint::Close() {
DCHECK(is_open_);
is_open_ = false;
DCHECK(is_attached());
channel_->DetachMessagePipeEndpoint(local_id_);
channel_ = NULL;
local_id_ = MessageInTransit::kInvalidEndpointId;
remote_id_ = MessageInTransit::kInvalidEndpointId;
STLDeleteElements(&paused_message_queue_);
}
void ProxyMessagePipeEndpoint::OnPeerClose() {
DCHECK(is_open_);
DCHECK(is_peer_open_);
is_peer_open_ = false;
EnqueueMessageInternal(make_scoped_ptr(
new MessageInTransit(MessageInTransit::OWNED_BUFFER,
MessageInTransit::kTypeMessagePipe,
MessageInTransit::kSubtypeMessagePipePeerClosed,
0, 0, NULL)));
}
void ProxyMessagePipeEndpoint::EnqueueMessage(
scoped_ptr<MessageInTransit> message,
std::vector<DispatcherTransport>* transports) {
DCHECK(!transports || !transports->empty());
if (transports)
AttachAndCloseDispatchers(message.get(), transports);
EnqueueMessageInternal(message.Pass());
}
void ProxyMessagePipeEndpoint::Attach(scoped_refptr<Channel> channel,
MessageInTransit::EndpointId local_id) {
DCHECK(channel.get());
DCHECK_NE(local_id, MessageInTransit::kInvalidEndpointId);
DCHECK(!is_attached());
AssertConsistentState();
channel_ = channel;
local_id_ = local_id;
AssertConsistentState();
}
void ProxyMessagePipeEndpoint::Run(MessageInTransit::EndpointId remote_id) {
// Assertions about arguments:
DCHECK_NE(remote_id, MessageInTransit::kInvalidEndpointId);
// Assertions about current state:
DCHECK(is_attached());
DCHECK(!is_running());
AssertConsistentState();
remote_id_ = remote_id;
AssertConsistentState();
for (std::deque<MessageInTransit*>::iterator it =
paused_message_queue_.begin(); it != paused_message_queue_.end();
++it)
EnqueueMessageInternal(make_scoped_ptr(*it));
paused_message_queue_.clear();
}
void ProxyMessagePipeEndpoint::AttachAndCloseDispatchers(
MessageInTransit* message,
std::vector<DispatcherTransport>* transports) {
DCHECK(transports);
DCHECK(!transports->empty());
// TODO(vtl)
LOG(ERROR) << "Sending handles over remote message pipes not yet supported "
"(closing sent handles)";
for (size_t i = 0; i < transports->size(); i++)
(*transports)[i].Close();
}
// Note: We may have to enqueue messages even when our (local) peer isn't open
// -- it may have been written to and closed immediately, before we were ready.
// This case is handled in |Run()| (which will call us).
void ProxyMessagePipeEndpoint::EnqueueMessageInternal(
scoped_ptr<MessageInTransit> message) {
DCHECK(is_open_);
if (is_running()) {
message->set_source_id(local_id_);
message->set_destination_id(remote_id_);
// If it fails at this point, the message gets dropped. (This is no
// different from any other in-transit errors.)
// Note: |WriteMessage()| will destroy the message even on failure.
if (!channel_->WriteMessage(message.Pass()))
LOG(WARNING) << "Failed to write message to channel";
} else {
paused_message_queue_.push_back(message.release());
}
}
#ifndef NDEBUG
void ProxyMessagePipeEndpoint::AssertConsistentState() const {
if (is_attached()) {
DCHECK_NE(local_id_, MessageInTransit::kInvalidEndpointId);
} else { // Not attached.
DCHECK_EQ(local_id_, MessageInTransit::kInvalidEndpointId);
DCHECK_EQ(remote_id_, MessageInTransit::kInvalidEndpointId);
}
}
#endif
} // namespace system
} // namespace mojo
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