gearman中任务的优先级和返回状态实例分析

doLow:最低优先
doNomal:正常优先级
doHigh:最优先执行

doLowBackground
doBackground
doHighBackground

addTaskLow
addTask
addTaskHigh

addTaskLowBackground 
addTaskBackground 
addTaskHighBackground

<?php
$client = new GearmanClient();
$client->addServer('127.0.0.1', 4730);
$client->setCompleteCallback(function($task) {
  echo $task->data(), PHP_EOL;
});
//分别添加不同优先级的Task
$client->addTaskLow('sum', json_encode(array(100, 100)));
$client->addTask('sum', json_encode(array(200, 200)));
$client->addTaskHigh('sum', json_encode(array(300, 300)));

$client->runTasks();

<?php
$worker = new GearmanWorker();
$worker->addServer('127.0.0.1', 4730);
$worker->addFunction('sum', function($job) {
  $data = json_decode($job->workload(), true);
  $ret = $data[0] + $data[1];
  echo $ret, PHP_EOL;
  sleep(1);
  return $ret;
});
while($worker->work());

<?php
$client = new GearmanClient();
$client->addServer('127.0.0.1', 4730);
//任务排队时的回调
$client->setCreatedCallback('reverse_create');
//有任务数据包时的回调
$client->setDataCallback('reverse_data');
//收集任务状态的回调
$client->setStatusCallback('reverse_status');
//任务完成时的回调
$client->setCompleteCallback('reverse_complete');
//任务失败时的回调
$client->setFailCallback('reverse_fail');
//分别添加不同优先级的Task
$client->addTaskLow('reverse', '1234567');
$client->addTask('reverse', 'hello');
$client->addTaskHigh('reverse', 'world');

$client->runTasks();

function reverse_create($task) {
  echo '任务创建(', $task->jobHandle() , '): ', PHP_EOL;
}
function reverse_data($task) {
  echo '接收数据(', $task->jobHandle() , '): ', $task->data(), PHP_EOL;
}
function reverse_status($task) {
  //taskNumerator()获取任务完成情况的分子
  //taskDenominator()获取任务完成情况的分母
  echo '完成情况(', $task->jobHandle() , '): ', $task->taskNumerator(), '/', $task->taskDenominator(), PHP_EOL;
}
function reverse_complete($task) {
  echo '任务完成(', $task->jobHandle() , '): ', $task->data(), PHP_EOL;
}
function reverse_fail($task) {
  echo '任务失败(', $task->jobHandle() , '): ', PHP_EOL;
}

<?php
$worker = new GearmanWorker();
$worker->addServer('127.0.0.1', 4730);
$worker->addFunction('reverse', function($job) {
  //workload()返回接收的数据
  $data = $job->workload();
  //workloadSize()返回接收数据的字节大小
  $dataSize = $job->workloadSize();
  echo "worker: {$data} ({$dataSize}) \n";

  $tmp = 0;
  $mid = $dataSize / 2;
  for($ix = 0; $ix < $mid; ++$ix) {
    $tmp = $data[$ix];
    $data[$ix] = $data[$dataSize - $ix - 1];
    $data[$dataSize - $ix - 1] = $tmp;

    //这里发送状态，会被client设置的回调reverse_status()接收到
    //状态完成情况的分子与分母
    $job->sendStatus($ix + 1, $mid + 1);
    //发送数据，被reverse_data()接收到
    $job->sendData($data);
    sleep(1);
  }
  return $data;
});
while($worker->work());