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/* -*- C++ -*- */
//=============================================================================
/**
* @file Command_Processor.h
*
* $Id$
*
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//=============================================================================
#ifndef _COMMAND_PROCESSOR_H
#define _COMMAND_PROCESSOR_H
#if !defined (ACE_LACKS_PRAGMA_ONCE)
#pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Containers.h"
#include "Options.h"
// Forward decl.
class URL;
/**
* @class Command
*
* @brief Abstract base class for a command.
*
* Each command is executed by a <Command_Processor>.
*/
class Command
{
public:
/// Virtual destructor.
virtual ~Command (void);
/// This is the entry point to execute the command.
virtual int execute (void) = 0;
virtual int destroy (void) = 0;
};
/**
* @class URL_Command
*
* @brief Defines an API for executing a command on a URL.
*
* Each command is executed by a <Command_Processor>.
*/
class URL_Command : public Command
{
public:
/// Constructor.
URL_Command (URL *);
/// Execute the URL command.
virtual int execute (void);
/// Commit suicide.
int destroy (void);
private:
/// Pointer to the URL.
URL *url_;
};
/**
* @class Command_Processor
*
* @brief Execute commands that are passed to it.
*
* This class implements the Command Processor pattern.
*/
class Command_Processor
{
public:
Command_Processor (void);
/// Insert a new <Command> into the <Command_Processor>'s queue.
int insert (Command *);
/// Execute all the <Commands> in the queue.
int execute (void);
/// Destroy the <Command_Processor>.
int destroy (void);
protected:
/// Ensure dynamic allocation.
~Command_Processor (void);
private:
// @@ You fill in here...
ACE_Unbounded_Queue<Command *> url_queue_;
};
#endif /* _COMMAND_PROCESSOR_H */
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