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#ifndef _posix_EventChannelThreads_h
#define _sys_EventChannelThreads_h
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include <vector>
#include <Exception.h>
#include <sys/Time.h>
#include <sys/Monitor.h>
#include <sys/Thread.h>
#include <sys/AtomicCount.h>
#include "EventChannel.h"
namespace qpid {
namespace sys {
/**
Dynamic thread pool serving an EventChannel.
Threads run a loop { e = getEvent(); e->dispatch(); }
The size of the thread pool is automatically adjusted to optimal size.
*/
class EventChannelThreads :
public qpid::SharedObject<EventChannelThreads>,
public sys::Monitor, private sys::Runnable
{
public:
/** Create the thread pool and start initial threads. */
static EventChannelThreads::shared_ptr create(
EventChannel::shared_ptr channel
);
~EventChannelThreads();
/** Post event to the underlying channel */
void postEvent(Event& event) { channel->postEvent(event); }
/** Post event to the underlying channel Must not be 0. */
void postEvent(Event* event) { channel->postEvent(event); }
/**
* Terminate all threads.
*
* Returns immediately, use join() to wait till all threads are
* shut down.
*/
void shutdown();
/** Wait for all threads to terminate. */
void join();
private:
typedef std::vector<sys::Thread> Threads;
typedef enum {
RUNNING, TERMINATE_SENT, JOINING, SHUTDOWN
} State;
EventChannelThreads(EventChannel::shared_ptr underlyingChannel);
void addThread();
void run();
bool keepRunning();
void adjustThreads();
EventChannel::shared_ptr channel;
Threads workers;
sys::AtomicCount nWaiting;
State state;
Event terminate;
};
}}
#endif /*!_sys_EventChannelThreads_h*/
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