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144 lines
4.5 KiB
144 lines
4.5 KiB
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#ifndef THRIFT_ASYNC_TASYNCTIMEOUT_H_
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#define THRIFT_ASYNC_TASYNCTIMEOUT_H_ 1
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#include "thrift/lib/cpp/thrift_config.h"
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#include "thrift/lib/cpp/async/TEventUtil.h"
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#include <boost/noncopyable.hpp>
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namespace apache { namespace thrift { namespace async {
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class TEventBase;
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/**
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* TAsyncTimeout is used to asynchronously wait for a timeout to occur.
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*/
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class TAsyncTimeout : private boost::noncopyable {
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public:
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enum InternalEnum {
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INTERNAL,
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NORMAL
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};
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/**
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* Create a new TAsyncTimeout object, driven by the specified TEventBase.
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*/
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explicit TAsyncTimeout(TEventBase* eventBase);
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/**
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* Create a new internal TAsyncTimeout object.
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*
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* Internal timeouts are like regular timeouts, but will not stop the
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* TEventBase loop from exiting if the only remaining events are internal
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* timeouts.
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*
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* This is useful for implementing fallback timeouts to abort the TEventBase
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* loop if the other events have not been processed within a specified time
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* period: if the event loop takes too long the timeout will fire and can
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* stop the event loop. However, if all other events complete, the event
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* loop will exit even though the internal timeout is still installed.
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*/
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TAsyncTimeout(TEventBase* eventBase, InternalEnum internal);
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/**
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* Create a new TAsyncTimeout object, not yet assigned to a TEventBase.
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*
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* attachEventBase() must be called prior to scheduling the timeout.
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*/
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TAsyncTimeout();
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/**
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* TAsyncTimeout destructor.
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*
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* The timeout will be automatically cancelled if it is running.
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*/
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virtual ~TAsyncTimeout();
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/**
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* timeoutExpired() is invoked when the timeout period has expired.
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*/
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virtual void timeoutExpired() THRIFT_NOEXCEPT = 0;
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/**
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* Schedule the timeout to fire in the specified number of milliseconds.
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*
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* After the specified number of milliseconds has elapsed, timeoutExpired()
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* will be invoked by the TEventBase's main loop.
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*
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* If the timeout is already running, it will be rescheduled with the
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* new timeout value.
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*
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* @param milliseconds The timeout duration, in milliseconds.
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*
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* @return Returns true if the timeout was successfully scheduled,
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* and false if an error occurred. After an error, the timeout is
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* always unscheduled, even if scheduleTimeout() was just
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* rescheduling an existing timeout.
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*/
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bool scheduleTimeout(uint32_t milliseconds);
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/**
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* Cancel the timeout, if it is running.
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*/
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void cancelTimeout();
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/**
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* Returns true if the timeout is currently scheduled.
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*/
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bool isScheduled() {
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return TEventUtil::isEventRegistered(&event_);
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}
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/**
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* Attach the timeout to a TEventBase.
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*
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* This may only be called if the timeout is not currently attached to a
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* TEventBase (either by using the default constructor, or by calling
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* detachEventBase()).
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*
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* This method must be invoked in the TEventBase's thread.
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*
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* The internal parameter specifies if this timeout should be treated as an
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* internal event. TEventBase::loop() will return when there are no more
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* non-internal events remaining.
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*/
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void attachEventBase(TEventBase* eventBase,
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InternalEnum internal = NORMAL);
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/**
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* Detach the timeout from its TEventBase.
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*
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* This may only be called when the timeout is not running.
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* Once detached, the timeout may not be scheduled again until it is
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* re-attached to a TEventBase by calling attachEventBase().
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*
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* This method must be called from the current TEventBase's thread.
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*/
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void detachEventBase();
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private:
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static void libeventCallback(int fd, short events, void* arg);
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struct event event_;
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};
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}}} // apache::thrift::async
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#endif // THRIFT_ASYNC_TASYNCTIMEOUT_H_
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