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//
// Copyright 2016 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// signal_utils:
// Helper classes for tracking dependent state changes between objects.
// These changes are signaled to the dependent class via channels.
#include "libANGLE/signal_utils.h"
#include <algorithm>
#include "common/debug.h"
namespace angle
{
BroadcastChannel::BroadcastChannel()
{
}
BroadcastChannel::~BroadcastChannel()
{
reset();
}
void BroadcastChannel::addReceiver(ChannelBinding *receiver)
{
ASSERT(std::find(mReceivers.begin(), mReceivers.end(), receiver) == mReceivers.end());
mReceivers.push_back(receiver);
}
void BroadcastChannel::removeReceiver(ChannelBinding *receiver)
{
auto iter = std::find(mReceivers.begin(), mReceivers.end(), receiver);
ASSERT(iter != mReceivers.end());
mReceivers.erase(iter);
}
void BroadcastChannel::signal() const
{
if (mReceivers.empty())
return;
for (const auto *receiver : mReceivers)
{
receiver->signal();
}
}
void BroadcastChannel::reset()
{
for (auto receiver : mReceivers)
{
receiver->onChannelClosed();
}
mReceivers.clear();
}
ChannelBinding::ChannelBinding(SignalReceiver *receiver, SignalToken token)
: mChannel(nullptr), mReceiver(receiver), mToken(token)
{
ASSERT(receiver);
}
ChannelBinding::~ChannelBinding()
{
reset();
}
void ChannelBinding::bind(BroadcastChannel *channel)
{
ASSERT(mReceiver);
if (mChannel)
{
mChannel->removeReceiver(this);
}
mChannel = channel;
if (mChannel)
{
mChannel->addReceiver(this);
}
}
void ChannelBinding::reset()
{
bind(nullptr);
}
void ChannelBinding::signal() const
{
mReceiver->signal(mToken);
}
void ChannelBinding::onChannelClosed()
{
mChannel = nullptr;
}
} // namespace angle
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