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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.
#include "chrome/browser/chromeos/dbus/blocking_method_caller.h"
#include "base/bind.h"
#include "dbus/bus.h"
#include "dbus/object_proxy.h"
namespace chromeos {
namespace {
// A utility class to ensure the WaitableEvent is signaled.
class WaitableEventSignaler {
public:
explicit WaitableEventSignaler(base::WaitableEvent* event) : event_(event) {}
~WaitableEventSignaler() {
event_->Signal();
}
private:
base::WaitableEvent* event_;
};
// This function is a part of CallMethodAndBlock implementation.
void CallMethodAndBlockInternal(
dbus::Response** response,
WaitableEventSignaler* signaler,
dbus::ObjectProxy* proxy,
dbus::MethodCall* method_call) {
*response = proxy->CallMethodAndBlock(
method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT);
}
} // namespace
BlockingMethodCaller::BlockingMethodCaller(dbus::Bus* bus,
dbus::ObjectProxy* proxy)
: bus_(bus),
proxy_(proxy),
on_blocking_method_call_(false /* manual_reset */,
false /* initially_signaled */) {
}
BlockingMethodCaller::~BlockingMethodCaller() {
}
dbus::Response* BlockingMethodCaller::CallMethodAndBlock(
dbus::MethodCall* method_call) {
WaitableEventSignaler* signaler =
new WaitableEventSignaler(&on_blocking_method_call_);
dbus::Response* response = NULL;
bus_->PostTaskToDBusThread(
FROM_HERE,
base::Bind(&CallMethodAndBlockInternal,
&response,
base::Owned(signaler),
base::Unretained(proxy_),
method_call));
on_blocking_method_call_.Wait();
return response;
}
} // namespace chromeos
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