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/* -*- c++ -*- */
#ifndef JAWS_CONCURRENCY_H
#define JAWS_CONCURRENCY_H
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Task.h"
#include "JAWS_IO.h"
class JAWS_Concurrency_Base : public ACE_Task<ACE_SYNCH>
// = TITLE
// Base class for different concurrency models
//
// = DESCRIPTION
// Provides a default implementaion of the virtual put() method
// which calls putq(), but can be overloaded to do something
// synchronously, such as call put_next().
{
public:
JAWS_Concurrency_Base (void);
virtual int put (ACE_Message_Block *mb, ACE_Time_Value *tv = 0);
virtual int svc (void);
};
class JAWS_Dispatch_Policy
// = TITLE
// Policy mechanism for choosing different concurrency models.
//
// = DESCRIPTION
// Given some (unspecified) state, decides what the concurrency
// model should be. (For now, we always return the same model.)
{
public:
JAWS_Dispatch_Policy (void);
virtual ~JAWS_Dispatch_Policy (void);
virtual JAWS_Concurrency_Base * update (void *state = 0) = 0;
};
class JAWS_Dispatcher
// = TITLE
// The class that is responsible to delivering events to the
// appropriate concurrency mechanism.
//
// = DESCRIPTION
// JAWS_IO_Handler calls into the dispatcher so that the completed
// IO can find a thread to take care of it.
{
public:
JAWS_Dispatcher (JAWS_Dispatch_Policy *policy);
int dispatch (JAWS_IO_Handler *ioh);
private:
JAWS_Dispatch_Policy *policy_;
};
class JAWS_Thread_Pool_Task : public JAWS_Concurrency_Base
// = TITLE
// Used to implement Thread Pool Concurrency Strategy
//
// = DESCRIPTION
// This task is created to hold a pool of threads that receive
// requests through the message queue.
{
public:
JAWS_Thread_Pool_Task (long flags = THR_NEW_LWP,
int nthreads = 5,
int maxthreads = 20);
private:
int nthreads_;
int maxthreads_;
};
class JAWS_Thread_Per_Task : public JAWS_Concurrency_Base
// = TITLE
// Used to implement Thread Per Request Concurrency Strategy
//
// = DESCRIPTION
// As each new message arrives from the queue, a new thread is
// spawned to handle it. This is done by overloading put to call
// activate.
{
public:
JAWS_Thread_Per_Task (long flags = THR_NEW_LWP, int maxthreads = 20);
virtual int put (ACE_Message_Block *mb, ACE_Time_Value *tv = 0);
private:
long flags_;
int maxthreads_;
};
#endif /* !defined (JAWS_CONCURRENCY_H) */
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