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.TH "GEARMAN_EXECUTE" "3" "Jan 29, 2019" "1.1.18+ds" "Gearmand"
.SH NAME
gearman_execute \- Gearmand Documentation, http://gearman.info/
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.SH SYNOPSIS
.sp
#include <libgearman/gearman.h>
.INDENT 0.0
.TP
.B gearman_task_st *gearman_execute(gearman_client_st\fI\ *client\fP, const char\fI\ *function_name\fP, size_t\fI\ function_name_length\fP, const char\fI\ *unique\fP, size_t\fI\ unique_length\fP, gearman_work_t\fI\ *workload\fP, gearman_argument_t\fI\ *arguments\fP, void\fI\ *context\fP)
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.TP
.B gearman_task_st *gearman_execute_by_partition(gearman_client_st\fI\ *client\fP, const char\fI\ *partition_function\fP, const size_t\fI\ partition_function_length\fP, const char\fI\ *function_name\fP, const size_t\fI\ function_name_length\fP, const char\fI\ *unique_str\fP, const size_t\fI\ unique_length\fP, gearman_work_t\fI\ *workload\fP, gearman_argument_t\fI\ *arguments\fP, void\fI\ *context\fP)
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.sp
Link with \-lgearman
.SH DESCRIPTION
.sp
\fI\%gearman_execute()\fP is used to create a new \fBgearman_task_st\fP that is executed against the function that is found via the function_name argument.
.sp
\fBgearman_work_t\fP can be used to describe the work that will be
executed, it is built with \fBgearman_argument_make()\fP\&.  The argument
unique_str is optional, but if supplied it is used for coalescence by
\fBgearmand\fP\&.
.sp
\fBgearman_argument_t\fP is the work that the client will send
the to the server
.sp
If \fI\%gearman_execute()\fP is given a \fBgearman_work_t\fP that has been built with a reducer, it takes the \fBgearman_argument_t\fP and executs it against a function as it normally would, but it tells the function to then process the results through a reducer function that the \fBgearman_work_t\fP was created with.
.sp
What is happening is that the function is mappping/splitting work up into units, and then sending each of them to the reducer function. Once all work is completed, the mapper function will aggregate the work via an aggregator function, \fBgearman_aggregator_fn\fP, and return a result.
.sp
If any of the units of work error, the job will be aborted. The resulting value will be stored in the \fBgearman_task_st\fP\&.
.sp
The result can be obtained from the task by calling
\fBgearman_task_result()\fP to gain the \fBgearman_result_st\fP\&.
.SH RETURN VALUE
.sp
\fI\%gearman_execute()\fP returns a c:type:\fIgearman_task_st\fP\&.
.SH EXAMPLE
.INDENT 0.0
.INDENT 3.5
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.nf
.ft C
/*
  Example code to show how to send a string to a function called "reverse" and print the results.
*/

/*
# Gearman server and library
# Copyright (C) 2012 Data Differential, http://datadifferential.com/
# All rights reserved.
#
# Use and distribution licensed under the BSD license.  See
# the COPYING file in this directory for full text.
*/

#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <libgearman/gearman.h>

int main(void)
{
  gearman_client_st *client= gearman_client_create(NULL);

  gearman_return_t ret= gearman_client_add_server(client, "localhost", 0);
  if (gearman_failed(ret))
  {
    return EXIT_FAILURE;
  }

  gearman_argument_t value= gearman_argument_make(0, 0, "Reverse Me", strlen("Reverse Me"));

  gearman_task_st *task= gearman_execute(client, 
                                         "reverse", strlen("reverse"),  // function
                                         NULL, 0,  // no unique value provided
                                         NULL, 
                                         &value, 0);

  if (task == NULL) // If gearman_execute() can return NULL on error
  {
    fprintf(stderr, "Error: %s\en", gearman_client_error(client));
    gearman_client_free(client);
    return EXIT_FAILURE;
  }

  // Make sure the task was run successfully
  if (gearman_success(gearman_task_return(task)))
  {
    // Make use of value
    gearman_result_st *result= gearman_task_result(task);
    printf("%.*s\en", (int)gearman_result_size(result), gearman_result_value(result));
  }

  gearman_client_free(client);

  return EXIT_SUCCESS;
}

.ft P
.fi
.UNINDENT
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.SH HOME
.sp
To find out more information please check:
\fI\%http://gearman.info/\fP
.SH SEE ALSO
.sp
\fBgearmand(8)\fP \fBlibgearman(3)\fP
.SH AUTHOR
Data Differential http://www.datadifferential.com/
.SH COPYRIGHT
2011-2019, Data Differential, http://www.datadifferential.com/
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