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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 "media/base/callback_util.h"
#include "base/bind.h"
#include "base/synchronization/lock.h"
#include "base/memory/ref_counted.h"
#include "base/message_loop.h"
#include "base/message_loop_proxy.h"
namespace media {
// Executes the given closure if and only if the closure returned by
// GetClosure() has been executed exactly |count| times.
//
// |done_cb| will be executed on the same thread that created the CountingCB.
class CountingCB : public base::RefCountedThreadSafe<CountingCB> {
public:
CountingCB(int count, const base::Closure& done_cb)
: message_loop_(base::MessageLoopProxy::current()),
count_(count),
done_cb_(done_cb) {
}
// Returns a closure bound to this object.
base::Closure GetClosure() {
return base::Bind(&CountingCB::OnCallback, this);
}
protected:
friend class base::RefCountedThreadSafe<CountingCB>;
virtual ~CountingCB() {}
private:
void OnCallback() {
{
base::AutoLock l(lock_);
count_--;
DCHECK_GE(count_, 0) << "CountingCB executed too many times";
if (count_ != 0)
return;
}
if (!message_loop_->BelongsToCurrentThread()) {
message_loop_->PostTask(FROM_HERE, done_cb_);
return;
}
done_cb_.Run();
}
scoped_refptr<base::MessageLoopProxy> message_loop_;
base::Lock lock_;
int count_;
base::Closure done_cb_;
DISALLOW_COPY_AND_ASSIGN(CountingCB);
};
static void OnSeriesCallback(
scoped_refptr<base::MessageLoopProxy> message_loop,
scoped_ptr<std::queue<ClosureFunc> > closures,
const base::Closure& done_cb) {
if (!message_loop->BelongsToCurrentThread()) {
message_loop->PostTask(FROM_HERE, base::Bind(
&OnSeriesCallback, message_loop, base::Passed(&closures), done_cb));
return;
}
if (closures->empty()) {
done_cb.Run();
return;
}
ClosureFunc cb = closures->front();
closures->pop();
cb.Run(base::Bind(
&OnSeriesCallback, message_loop, base::Passed(&closures), done_cb));
}
void RunInSeries(scoped_ptr<std::queue<ClosureFunc> > closures,
const base::Closure& done_cb) {
OnSeriesCallback(base::MessageLoopProxy::current(),
closures.Pass(), done_cb);
}
static void OnStatusCallback(
scoped_refptr<base::MessageLoopProxy> message_loop,
scoped_ptr<std::queue<PipelineStatusCBFunc> > status_cbs,
const PipelineStatusCB& done_cb,
PipelineStatus last_status) {
if (!message_loop->BelongsToCurrentThread()) {
message_loop->PostTask(FROM_HERE, base::Bind(
&OnStatusCallback, message_loop, base::Passed(&status_cbs), done_cb,
last_status));
return;
}
if (status_cbs->empty() || last_status != PIPELINE_OK) {
done_cb.Run(last_status);
return;
}
PipelineStatusCBFunc status_cb = status_cbs->front();
status_cbs->pop();
status_cb.Run(base::Bind(
&OnStatusCallback, message_loop, base::Passed(&status_cbs), done_cb));
}
void RunInSeriesWithStatus(
scoped_ptr<std::queue<PipelineStatusCBFunc> > status_cbs,
const PipelineStatusCB& done_cb) {
OnStatusCallback(base::MessageLoopProxy::current(),
status_cbs.Pass(), done_cb, PIPELINE_OK);
}
void RunInParallel(scoped_ptr<std::queue<ClosureFunc> > closures,
const base::Closure& done_cb) {
if (closures->empty()) {
done_cb.Run();
return;
}
scoped_refptr<CountingCB> counting_cb =
new CountingCB(closures->size(), done_cb);
while (!closures->empty()) {
closures->front().Run(counting_cb->GetClosure());
closures->pop();
}
}
} // namespace media
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