gearman/libgearman/actions.cc

/*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 * 
 *  Gearmand client and server library.
 *
 *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *
 *      * Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *      * Redistributions in binary form must reproduce the above
 *  copyright notice, this list of conditions and the following disclaimer
 *  in the documentation and/or other materials provided with the
 *  distribution.
 *
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 *  promote products derived from this software without specific prior
 *  written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */

#include <libgearman/common.h>

#include <libgearman/unique.h>
#include <libgearman/result.hpp>
#include <memory>

struct gearman_result_st;

static gearman_return_t _client_pause_data(gearman_task_st *task)
{
  if (task->options.is_paused)
  {
    task->options.is_paused= false;
    return GEARMAN_SUCCESS;
  }

  if (gearman_task_data_size(task))
  {
    if (not task->result_ptr)
    {
      task->result_ptr= new (std::nothrow) gearman_result_st(gearman_task_data_size(task));
    }
    else
    {
      task->result_ptr->clear();
    }
    assert_msg(task->result_ptr, "programmer error, result_ptr has not been allocated for task");

    gearman_string_append(gearman_task_mutable_result(task)->string(), static_cast<const char*>(gearman_task_data(task)), gearman_task_data_size(task));
  }

  if (task->recv->command == GEARMAN_COMMAND_WORK_DATA)
  { }
  else if (task->recv->command == GEARMAN_COMMAND_WORK_WARNING)
  { }
  else if (task->recv->command == GEARMAN_COMMAND_WORK_EXCEPTION)
  { }
  else // GEARMAN_COMMAND_WORK_COMPLETE
  {
    return GEARMAN_SUCCESS;
  }

  task->options.is_paused= true;

  return GEARMAN_PAUSE;
}

static gearman_return_t _client_pause_complete(gearman_task_st *task)
{
  return _client_pause_data(task);
}


static gearman_return_t _client_pause_status(gearman_task_st *task)
{
  assert_msg(task->recv->command == GEARMAN_COMMAND_WORK_STATUS or
             task->recv->command == GEARMAN_COMMAND_STATUS_RES, "status has been called out of order for task, or was registered to run on non-status callback, see gearman_actions_t(3)");
  if (task->options.is_paused)
  {
    task->options.is_paused= false;
    return GEARMAN_SUCCESS;
  }
  task->options.is_paused= true;

  return GEARMAN_PAUSE;
}

static gearman_return_t _client_pause_fail(gearman_task_st *task)
{
  assert_msg(task->recv->command == GEARMAN_COMMAND_WORK_FAIL, 
             "fail callback has been called out of order for task, or was registered to run on non-fail callback, see gearman_actions_t(3)");
  if (task->options.is_paused)
  {
    task->options.is_paused= false;
    return GEARMAN_SUCCESS;
  }
  task->options.is_paused= true;

  return GEARMAN_PAUSE;
}

static gearman_return_t _client_do_data(gearman_task_st *task)
{
  if (gearman_task_data_size(task))
  {
    if (not task->result_ptr)
    {
      task->result_ptr= new (std::nothrow) gearman_result_st(gearman_task_data_size(task));
      if (not task->result_ptr)
      {
        return GEARMAN_MEMORY_ALLOCATION_FAILURE;
      }
    }

    gearman_string_append(gearman_task_mutable_result(task)->string(), static_cast<const char*>(gearman_task_data(task)), gearman_task_data_size(task));
  }

  return GEARMAN_SUCCESS;
}

static gearman_return_t _client_do_complete(gearman_task_st *task)
{
  if (gearman_task_data_size(task))
  {
    if (not task->result_ptr)
    {
      task->result_ptr= new (std::nothrow) gearman_result_st(gearman_task_data_size(task));
      if (not task->result_ptr)
      {
        return GEARMAN_MEMORY_ALLOCATION_FAILURE;
      }
    }

    gearman_string_append(gearman_task_mutable_result(task)->string(), static_cast<const char*>(gearman_task_data(task)), gearman_task_data_size(task));
  }

  task->result_rc= GEARMAN_SUCCESS;

  return GEARMAN_SUCCESS;
}

const gearman_actions_t &gearman_actions_default(void)
{
  static gearman_actions_t default_actions= { 0, 0, 0, 0, 0, 0, 0, 0 };

  return default_actions;
}


const gearman_actions_t &gearman_actions_do_default(void)
{
  static gearman_actions_t default_actions= { 0, 0, _client_do_data, 0, 0, _client_do_complete, 0, 0 };

  return default_actions;
}

const gearman_actions_t &gearman_actions_execute_defaults(void)
{
  static gearman_actions_t default_actions= { 0, 0, _client_do_data, 0, 0, _client_do_complete, 0, 0 };

  return default_actions;
}

const gearman_actions_t &gearman_actions_pause(void)
{
  static gearman_actions_t default_actions= { 0, 0, 
    _client_pause_data,  // gearman_data_fn
    _client_pause_data,  // gearman_warning_fn
    _client_pause_status,  // gearman_universal_status_fn
    _client_pause_complete, // gearman_complete_fn 
    _client_pause_data, // gearman_exception_fn
    _client_pause_fail }; // gearman_fail_fn

  return default_actions;
}