Move ChildThread and ChildProcess to content. Also move remaining code that they depend on and which depends on them.TBR=avi

Review URL: http://codereview.chromium.org/6628071

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@77249 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 206 insertions, 0 deletions

diff --git a/content/common/child_thread.cc b/content/common/child_thread.cc
new file mode 100644
index 0000000..f2410e2
--- /dev/null
+++ b/content/common/child_thread.cc
@@ -0,0 +1,206 @@
+// 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 "content/common/child_thread.h"
+
+#include "base/message_loop.h"
+#include "base/string_util.h"
+#include "base/command_line.h"
+#include "content/common/child_process.h"
+#include "content/common/child_process_messages.h"
+#include "content/common/content_switches.h"
+#include "content/common/file_system/file_system_dispatcher.h"
+#include "content/common/notification_service.h"
+#include "content/common/resource_dispatcher.h"
+#include "content/common/socket_stream_dispatcher.h"
+#include "ipc/ipc_logging.h"
+#include "ipc/ipc_sync_channel.h"
+#include "ipc/ipc_sync_message_filter.h"
+#include "ipc/ipc_switches.h"
+#include "webkit/glue/webkit_glue.h"
+
+ChildThread::ChildThread() {
+  channel_name_ = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+      switches::kProcessChannelID);
+  Init();
+}
+
+ChildThread::ChildThread(const std::string& channel_name)
+    : channel_name_(channel_name) {
+  Init();
+}
+
+void ChildThread::Init() {
+  check_with_browser_before_shutdown_ = false;
+  on_channel_error_called_ = false;
+  message_loop_ = MessageLoop::current();
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUserAgent)) {
+    webkit_glue::SetUserAgent(
+        CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+            switches::kUserAgent));
+  }
+
+  channel_.reset(new IPC::SyncChannel(channel_name_,
+      IPC::Channel::MODE_CLIENT, this,
+      ChildProcess::current()->io_message_loop(), true,
+      ChildProcess::current()->GetShutDownEvent()));
+#ifdef IPC_MESSAGE_LOG_ENABLED
+  IPC::Logging::GetInstance()->SetIPCSender(this);
+#endif
+
+  resource_dispatcher_.reset(new ResourceDispatcher(this));
+  socket_stream_dispatcher_.reset(new SocketStreamDispatcher());
+  file_system_dispatcher_.reset(new FileSystemDispatcher());
+
+  sync_message_filter_ =
+      new IPC::SyncMessageFilter(ChildProcess::current()->GetShutDownEvent());
+  channel_->AddFilter(sync_message_filter_.get());
+
+  // When running in unit tests, there is already a NotificationService object.
+  // Since only one can exist at a time per thread, check first.
+  if (!NotificationService::current())
+    notification_service_.reset(new NotificationService);
+}
+
+ChildThread::~ChildThread() {
+#ifdef IPC_MESSAGE_LOG_ENABLED
+  IPC::Logging::GetInstance()->SetIPCSender(NULL);
+#endif
+
+  channel_->RemoveFilter(sync_message_filter_.get());
+
+  // Close this channel before resetting the message loop attached to it so
+  // the message loop can call ChannelProxy::Context::OnChannelClosed(), which
+  // releases the reference count to this channel.
+  channel_->Close();
+
+  // The ChannelProxy object caches a pointer to the IPC thread, so need to
+  // reset it as it's not guaranteed to outlive this object.
+  // NOTE: this also has the side-effect of not closing the main IPC channel to
+  // the browser process.  This is needed because this is the signal that the
+  // browser uses to know that this process has died, so we need it to be alive
+  // until this process is shut down, and the OS closes the handle
+  // automatically.  We used to watch the object handle on Windows to do this,
+  // but it wasn't possible to do so on POSIX.
+  channel_->ClearIPCMessageLoop();
+}
+
+void ChildThread::OnChannelError() {
+  set_on_channel_error_called(true);
+  MessageLoop::current()->Quit();
+}
+
+bool ChildThread::Send(IPC::Message* msg) {
+  if (!channel_.get()) {
+    delete msg;
+    return false;
+  }
+
+  return channel_->Send(msg);
+}
+
+void ChildThread::AddRoute(int32 routing_id, IPC::Channel::Listener* listener) {
+  DCHECK(MessageLoop::current() == message_loop());
+
+  router_.AddRoute(routing_id, listener);
+}
+
+void ChildThread::RemoveRoute(int32 routing_id) {
+  DCHECK(MessageLoop::current() == message_loop());
+
+  router_.RemoveRoute(routing_id);
+}
+
+IPC::Channel::Listener* ChildThread::ResolveRoute(int32 routing_id) {
+  DCHECK(MessageLoop::current() == message_loop());
+
+  return router_.ResolveRoute(routing_id);
+}
+
+webkit_glue::ResourceLoaderBridge* ChildThread::CreateBridge(
+    const webkit_glue::ResourceLoaderBridge::RequestInfo& request_info,
+    int host_renderer_id,
+    int host_render_view_id) {
+  return resource_dispatcher()->
+      CreateBridge(request_info, host_renderer_id, host_render_view_id);
+}
+
+ResourceDispatcher* ChildThread::resource_dispatcher() {
+  return resource_dispatcher_.get();
+}
+
+IPC::SyncMessageFilter* ChildThread::sync_message_filter() {
+  return sync_message_filter_;
+}
+
+MessageLoop* ChildThread::message_loop() {
+  return message_loop_;
+}
+
+bool ChildThread::OnMessageReceived(const IPC::Message& msg) {
+  // Resource responses are sent to the resource dispatcher.
+  if (resource_dispatcher_->OnMessageReceived(msg))
+    return true;
+  if (socket_stream_dispatcher_->OnMessageReceived(msg))
+    return true;
+  if (file_system_dispatcher_->OnMessageReceived(msg))
+    return true;
+
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(ChildThread, msg)
+    IPC_MESSAGE_HANDLER(ChildProcessMsg_AskBeforeShutdown, OnAskBeforeShutdown)
+    IPC_MESSAGE_HANDLER(ChildProcessMsg_Shutdown, OnShutdown)
+#if defined(IPC_MESSAGE_LOG_ENABLED)
+    IPC_MESSAGE_HANDLER(ChildProcessMsg_SetIPCLoggingEnabled,
+                        OnSetIPCLoggingEnabled)
+#endif
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+
+  if (handled)
+    return true;
+
+  if (msg.routing_id() == MSG_ROUTING_CONTROL)
+    return OnControlMessageReceived(msg);
+
+  return router_.OnMessageReceived(msg);
+}
+
+bool ChildThread::OnControlMessageReceived(const IPC::Message& msg) {
+  return false;
+}
+
+void ChildThread::OnAskBeforeShutdown() {
+  check_with_browser_before_shutdown_ = true;
+}
+
+void ChildThread::OnShutdown() {
+  MessageLoop::current()->Quit();
+}
+
+#if defined(IPC_MESSAGE_LOG_ENABLED)
+void ChildThread::OnSetIPCLoggingEnabled(bool enable) {
+  if (enable)
+    IPC::Logging::GetInstance()->Enable();
+  else
+    IPC::Logging::GetInstance()->Disable();
+}
+#endif  //  IPC_MESSAGE_LOG_ENABLED
+
+ChildThread* ChildThread::current() {
+  return ChildProcess::current()->main_thread();
+}
+
+void ChildThread::OnProcessFinalRelease() {
+  if (on_channel_error_called_ || !check_with_browser_before_shutdown_) {
+    MessageLoop::current()->Quit();
+    return;
+  }
+
+  // The child process shutdown sequence is a request response based mechanism,
+  // where we send out an initial feeler request to the child process host
+  // instance in the browser to verify if it's ok to shutdown the child process.
+  // The browser then sends back a response if it's ok to shutdown.
+  Send(new ChildProcessHostMsg_ShutdownRequest);
+}