Intro

Lightweight and powerful task load balancing.

like the nginx load balancing 😄

Features

• Support multiple drives for every task.
• Automatically choose a driver to execute task by drivers' weight value.
• Support multiple backup drivers.
• Task lifecycle and hooks system.

Install

composer require toplan/task-balancer:~0.5

Usage

//define a task
Balancer::task('task1', function($task){
    //define a driver for current task like this:
    $task->driver('driver_1 100 backup', function ($driver, $data) {
        //do something here
        ...
        //set whether run success/failure at last
        if ($success) {
            $driver->success();
        } else {
            $driver->failure();
        }
        //return some data you need
        return 'some data you need';
    });

    //or like this:
    $task->driver('driver_2', 90, function ($driver, $data) {
        //...same as above..
    })->data(['this is data 2']);

    //or like this:
    $task->driver('driver_3')
    ->weight(0)->backUp()
    ->data(['this is data 3'])
    ->work(function ($driver, $data) {
        //...same as above..
    });
});

//run the task
$result = Balancer::run('task1');

The $result structure:

[
    'success' => true,
    'time' => [
        'started_at' => timestamp,
        'finished_at' => timestamp
    ],
    'logs' => [
        '0' => [
            'driver' => 'driver_1',
            'success' => false,
            'time' => [
                'started_at' => timestamp,
                'finished_at' => timestamp
            ],
            'result' => 'some data you need'
        ],
        ...
    ]
]

API

Balancer

Balancer::task($name[, $data][, Closure $ready]);

Create a task instance, and return it. The closure $ready immediately called with argument $task.

Balancer::task('taskName', $data, function($task){
    //task's ready work, such as create drivers.
});

$data will store in the task instance.

Balancer::run($name[, array $options])

Run the task by name, and return the result data.

The keys of $options:

• data
• driver

Task

name($name)

set the name of task.

data($data)

Set the data of task.

driver($config[, $weight][, 'backup'], Closure $work)

Create a driver for the task. The closure $work will been called with arguments $driver and $data.

Expected $weight to be a integer, default 1.

$task->driver('driverName 80 backup', function($driver, $data){
    //driver's job content.
});

hasDriver($name)

Whether has the specified driver.

getDriver($name)

Get driver by name.

removeDriver($name)

Remove driver from drivers' pool by name.

Driver

weight($weight)

Set the weight value of driver.

backup($is)

Set whether backup driver.

Expected $is to be boolean, default true.

data($data)

Set the data of driver.

$data will store in driver instance.

work(Closure $work);

Set the job content of driver.

$data equals to $driver->getData()

reset($config[, $weight][, 'backup'], Closure $work)

Reset driver's weight value, job content and reset whether backup.

destroy()

Remove the driver from task which belongs to.

failure()

Set the driver running failure.

success()

Set the driver run successfully.

getDriverData()

Get the data which store in driver instance.

getTaskData()

Get the data which store in task instance.

Lifecycle & Hooks

Support multiple handlers for every hooks!

Hooks

Hook name	handler arguments	influence of the last handler's return value
beforeCreateDriver	$task, $props, $index, &$handlers, $prevReturn	if an array will been merged into original props
afterCreateDriver	$task, $driver, $index, &$handlers, $prevReturn	-
beforeRun	$task, $index, &$handlers, $prevReturn	if false will stop run task and return false
beforeDriverRun	$task, $driver, $index, &$handlers, $prevReturn	if false will stop to use current driver and try to use next backup driver
afterDriverRun	$task, $driverResult, $index, &$handlers, $prevReturn	-
afterRun	$task, $taskResult, $index, &$handlers, $prevReturn	if not boolean will override result value

Usage

• $task->hook($hookName, $handler, $override)

• $task->beforeCreateDriver($handler, $override)

• $task->afterCreateDriver($handler, $override)

• $task->beforeRun($handler, $override)

• $task->beforeDriverRun($handler, $override)

• $task->afterDriverRun($handler, $override)

• $task->afterRun($handler, $override)

$override default false.

//example
$task->beforeRun(function($task, $index, $handlers, $prevReturn){
    //what is $prevReturn?
    echo $prevReturn == null; //true
    //what is $index?
    echo $index == 0; //true
    //what is $handlers?
    echo count($handlers); //2
    //do something..
    return 'beforeRun_1';
}, false);

$task->beforeRun(function($task, $index, $handlers, $prevReturn){
    //what is $prevReturn?
    echo $prevReturn == 'beforeRun_1'; //true
    //what is $index?
    echo $index == 1; //true
    //what is $handlers?
    echo count($handlers); //2
    //do other something..
}, false);

Dependents

• phpsms

License

MIT