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