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#ifndef _broker_Daemon_h
#define _broker_Daemon_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 <string>
#include <boost/scoped_ptr.hpp>
#include <boost/function.hpp>
#include <boost/noncopyable.hpp>
namespace qpid {
namespace broker {
/**
* Tools for forking and managing a daemon process.
* NB: Only one Daemon instance is allowed in a process.
*/
class Daemon : private boost::noncopyable
{
public:
/** Check daemon is running on port, throw exception if not */
static pid_t getPid(uint16_t port);
Daemon();
virtual ~Daemon();
/**
* Fork a daemon process.
* Call parent() in the parent process, child() in the child.
*/
void fork();
protected:
/** Called in parent process */
virtual void parent() = 0;
/** Called in child process */
virtual void child() = 0;
/** Call from parent(): wait for child to indicate it is ready.
* @timeout in seconds to wait for response.
* @return port passed by child to ready().
*/
uint16_t wait(int timeout);
/** Call from child(): Notify the parent we are ready and write the
* PID file.
*@param port returned by parent call to wait().
*/
void ready(uint16_t port);
private:
static std::string dir();
static std::string pidFile(uint16_t port);
pid_t pid;
int pipeFds[2];
std::string lockFile;
};
}} // namespace qpid::broker
#endif /*!_broker_Daemon_h*/
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