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/*
*
* 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.
*
*/
#ifndef _LFProcessor_
#define _LFProcessor_
#include <apr_poll.h>
#include <iostream>
#include <vector>
#include <sys/Monitor.h>
#include <sys/Runnable.h>
#include <sys/Thread.h>
namespace qpid {
namespace sys {
class LFSessionContext;
/**
* This class processes a poll set using the leaders-followers
* pattern for thread synchronization: the leader will poll and on
* the poll returning, it will remove a session, promote a
* follower to leadership, then process the session.
*/
class LFProcessor : private virtual qpid::sys::Runnable
{
typedef std::vector<LFSessionContext*>::iterator iterator;
const int size;
const apr_interval_time_t timeout;
apr_pollset_t* pollset;
int signalledCount;
int current;
const apr_pollfd_t* signalledFDs;
int count;
const int workerCount;
bool hasLeader;
qpid::sys::Thread* workers;
qpid::sys::Monitor leadLock;
qpid::sys::Mutex countLock;
std::vector<LFSessionContext*> sessions;
volatile bool stopped;
const apr_pollfd_t* getNextEvent();
void waitToLead();
void relinquishLead();
void poll();
virtual void run();
public:
LFProcessor(apr_pool_t* pool, int workers, int size, int timeout);
/**
* Add the fd to the poll set. Relies on the client_data being
* an instance of LFSessionContext.
*/
void add(const apr_pollfd_t* const fd);
/**
* Remove the fd from the poll set.
*/
void remove(const apr_pollfd_t* const fd);
/**
* Signal that the fd passed in, already part of the pollset,
* has had its flags altered.
*/
void update(const apr_pollfd_t* const fd);
/**
* Add an fd back to the poll set after deactivation.
*/
void reactivate(const apr_pollfd_t* const fd);
/**
* Temporarily remove the fd from the poll set. Called when processing
* is about to begin.
*/
void deactivate(const apr_pollfd_t* const fd);
/**
* Indicates whether the capacity of this processor has been
* reached (or whether it can still handle further fd's).
*/
bool full();
/**
* Indicates whether there are any fd's registered.
*/
bool empty();
/**
* Stop processing.
*/
void stop();
/**
* Start processing.
*/
void start();
/**
* Is processing stopped?
*/
bool isStopped();
~LFProcessor();
};
}
}
#endif
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