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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/logging.h"
#include "mojo/system/channel.h"
#include "mojo/system/local_message_pipe_endpoint.h"
#include "mojo/system/message_pipe_dispatcher.h"
namespace mojo {
namespace system {
ProxyMessagePipeEndpoint::ProxyMessagePipeEndpoint()
: local_id_(MessageInTransit::kInvalidEndpointId),
remote_id_(MessageInTransit::kInvalidEndpointId),
is_peer_open_(true) {
}
ProxyMessagePipeEndpoint::ProxyMessagePipeEndpoint(
LocalMessagePipeEndpoint* local_message_pipe_endpoint,
bool is_peer_open)
: local_id_(MessageInTransit::kInvalidEndpointId),
remote_id_(MessageInTransit::kInvalidEndpointId),
is_peer_open_(is_peer_open),
paused_message_queue_(MessageInTransitQueue::PassContents(),
local_message_pipe_endpoint->message_queue()) {
local_message_pipe_endpoint->Close();
}
ProxyMessagePipeEndpoint::~ProxyMessagePipeEndpoint() {
DCHECK(!is_running());
DCHECK(!is_attached());
AssertConsistentState();
DCHECK(paused_message_queue_.IsEmpty());
}
MessagePipeEndpoint::Type ProxyMessagePipeEndpoint::GetType() const {
return kTypeProxy;
}
bool ProxyMessagePipeEndpoint::OnPeerClose() {
DCHECK(is_peer_open_);
is_peer_open_ = false;
// If our outgoing message queue isn't empty, we shouldn't be destroyed yet.
if (!paused_message_queue_.IsEmpty())
return true;
if (is_attached()) {
if (!is_running()) {
// If we're not running yet, we can't be destroyed yet, because we're
// still waiting for the "run" message from the other side.
return true;
}
Detach();
}
return false;
}
// 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::EnqueueMessage(
scoped_ptr<MessageInTransit> message) {
if (is_running()) {
message->SerializeAndCloseDispatchers(channel_.get());
message->set_source_id(local_id_);
message->set_destination_id(remote_id_);
if (!channel_->WriteMessage(message.Pass()))
LOG(WARNING) << "Failed to write message to channel";
} else {
paused_message_queue_.AddMessage(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();
}
bool 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();
while (!paused_message_queue_.IsEmpty())
EnqueueMessage(paused_message_queue_.GetMessage());
if (is_peer_open_)
return true; // Stay alive.
// We were just waiting to die.
Detach();
return false;
}
void ProxyMessagePipeEndpoint::OnRemove() {
Detach();
}
void ProxyMessagePipeEndpoint::Detach() {
DCHECK(is_attached());
AssertConsistentState();
channel_->DetachMessagePipeEndpoint(local_id_, remote_id_);
channel_ = NULL;
local_id_ = MessageInTransit::kInvalidEndpointId;
remote_id_ = MessageInTransit::kInvalidEndpointId;
paused_message_queue_.Clear();
AssertConsistentState();
}
#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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