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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <windows.h>
#include "chrome/plugin/plugin_process.h"
#include "base/basictypes.h"
#include "base/scoped_handle.h"
#include "chrome/common/ipc_channel.h"
#include "chrome/common/ipc_message_utils.h"
#include "chrome/common/plugin_messages.h"
#include "chrome/common/render_messages.h"
#include "webkit/glue/webkit_glue.h"
// Custom factory to allow us to pass additional ctor arguments.
class PluginProcessFactory : public ChildProcessFactoryInterface {
public:
explicit PluginProcessFactory(const std::wstring& plugin_path)
: plugin_path_(plugin_path) {
}
virtual ChildProcess* Create(const std::wstring& channel_name) {
return new PluginProcess(channel_name, plugin_path_);
}
const std::wstring& plugin_path_;
};
// How long to wait after there are no more plugin instances before killing the
// process.
static const int kProcessShutdownDelayMs = 10 * 1000;
// No AddRef required when using PluginProcess with RunnableMethod. This is
// okay since the lifetime of the PluginProcess is always greater than the
// lifetime of PluginThread because it's a member variable.
template <> struct RunnableMethodTraits<PluginProcess> {
static void RetainCallee(PluginProcess*) {}
static void ReleaseCallee(PluginProcess*) {}
};
PluginProcess::PluginProcess(const std::wstring& channel_name,
const std::wstring& plugin_path) :
plugin_path_(plugin_path),
#pragma warning(suppress: 4355) // Okay to pass "this" here.
plugin_thread_(this, channel_name) {
}
PluginProcess::~PluginProcess() {
}
bool PluginProcess::GlobalInit(const std::wstring &channel_name,
const std::wstring &plugin_path) {
PluginProcessFactory factory(plugin_path);
return ChildProcess::GlobalInit(channel_name, &factory);
}
// Note: may be called on any thread
void PluginProcess::OnFinalRelease() {
// We override this to have the process linger for a few seconds to
// better accomdate back/forth navigation. This avoids shutting down and
// immediately starting a new plugin process. If a new channel is
// opened in the interim, the current process will not be shutdown.
main_thread_loop_->PostDelayedTask(FROM_HERE, NewRunnableMethod(
this, &PluginProcess::OnProcessShutdownTimeout),
kProcessShutdownDelayMs);
}
void PluginProcess::OnProcessShutdownTimeout() {
if (ProcessRefCountIsZero()) {
// The plugin process shutdown sequence is a request response based
// mechanism, where we send out an initial feeler request to the plugin
// process host instance in the browser to verify if it is ok to shutdown
// the plugin process. The browser then sends back a response indicating
// whether it is ok to shutdown.
plugin_thread_.Send(new PluginProcessHostMsg_ShutdownRequest);
}
}
// static
void PluginProcess::ShutdownProcessResponse(bool ok_to_shutdown) {
if (ok_to_shutdown) {
PluginProcess* plugin_process =
static_cast<PluginProcess*>(child_process_);
DCHECK(plugin_process);
plugin_process->Shutdown();
}
}
void PluginProcess::BrowserShutdown() {
ShutdownProcessResponse(true);
}
void PluginProcess::Shutdown() {
ChildProcess::OnFinalRelease();
}
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