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// Copyright 2016 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 "mojo/edk/system/watcher_set.h"
#include <utility>
namespace mojo {
namespace edk {
WatcherSet::WatcherSet(Dispatcher* owner) : owner_(owner) {}
WatcherSet::~WatcherSet() = default;
void WatcherSet::NotifyState(const HandleSignalsState& state) {
// Avoid notifying watchers if they have already seen this state.
if (last_known_state_.has_value() && state.equals(last_known_state_.value()))
return;
last_known_state_ = state;
for (const auto& entry : watchers_)
entry.first->NotifyHandleState(owner_, state);
}
void WatcherSet::NotifyClosed() {
for (const auto& entry : watchers_)
entry.first->NotifyHandleClosed(owner_);
}
MojoResult WatcherSet::Add(const scoped_refptr<WatcherDispatcher>& watcher,
uintptr_t context,
const HandleSignalsState& current_state) {
auto it = watchers_.find(watcher.get());
if (it == watchers_.end()) {
auto result =
watchers_.insert(std::make_pair(watcher.get(), Entry{watcher}));
it = result.first;
}
if (!it->second.contexts.insert(context).second)
return MOJO_RESULT_ALREADY_EXISTS;
if (last_known_state_.has_value() &&
!current_state.equals(last_known_state_.value())) {
// This new state may be relevant to everyone, in which case we just
// notify everyone.
NotifyState(current_state);
} else {
// Otherwise only notify the newly added Watcher.
watcher->NotifyHandleState(owner_, current_state);
}
return MOJO_RESULT_OK;
}
MojoResult WatcherSet::Remove(WatcherDispatcher* watcher, uintptr_t context) {
auto it = watchers_.find(watcher);
if (it == watchers_.end())
return MOJO_RESULT_NOT_FOUND;
ContextSet& contexts = it->second.contexts;
auto context_it = contexts.find(context);
if (context_it == contexts.end())
return MOJO_RESULT_NOT_FOUND;
contexts.erase(context_it);
if (contexts.empty())
watchers_.erase(it);
return MOJO_RESULT_OK;
}
WatcherSet::Entry::Entry(const scoped_refptr<WatcherDispatcher>& dispatcher)
: dispatcher(dispatcher) {}
WatcherSet::Entry::Entry(Entry&& other) = default;
WatcherSet::Entry::~Entry() = default;
WatcherSet::Entry& WatcherSet::Entry::operator=(Entry&& other) = default;
} // namespace edk
} // namespace mojo
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