README

A better way to create and manage complex batch job queues in Laravel:

Relay::chain([new Job1, new Job2])
    ->batch([new Job3_1, new Job3_2])
    ->chain([new Job4, new Job5])
    ->through([new Middleware])
    ->dispatch();

Main features

• Relay doesn't create/modify DB tables
• Clean looking complex batches
• Ability to set middleware for multiple jobs
• Search for specific batch via metadata
• Monitor batch progress
• Search for failed jobs

Installation

composer require agatanga/relay

Usage Examples

Flatten nested callbacks

Here is a flattened batches written with Relay:

use Agatanga\Relay\Facades\Relay;

Relay::chain('Downloading', [
        new DownloadSources($project),
        new DetectSettings($project),
    ])
    ->then('Updating project data', [
        new ReadStringFiles($project),
        new ReadSourceFiles($project),
    ])
    ->then('Updating project data', [
        new FixFalseUnusedStrings($project),
    ])
    ->finally('Cleaning up', [
        new IgnoreKnownStrings($project),
        new RemoveSources($project),
    ])
    ->through(new Middleware($project))
    ->dispatch();

Bus::batch([
    [
        new DownloadSources($project)->through(new Middleware($project)),
        new DetectSettings($project)->through(new Middleware($project)),
    ],
])->then(function (Batch $batch) use ($project) {
    Bus::batch([
        new ReadStringFiles($project)->through(new Middleware($project)),
        new ReadSourceFiles($project)->through(new Middleware($project)),
    ])->then(function (Batch $batch) use ($project) {
        Bus::batch([
            new FixFalseUnusedStrings($project)->through(new Middleware($project)),
        ])->finally(function (Batch $batch) use ($project) {
            Bus::batch([
                new IgnoreKnownStrings($project)->through(new Middleware($project)),
                new RemoveSources($project)->through(new Middleware($project)),
            ])->name('Cleaning up')->dispatch();
        })->name('Updating project data')->dispatch();
    })->name('Updating project data')->dispatch();
})->name('Downloading')->dispatch();

Middleware

Relay allows you to set middleware for multiple jobs:

Relay::chain([new Job1, new Job2])
    ->batch([new Job3_1, new Job3_2])
    ->chain([new Job4, new Job5], [new Middleware1])
    ->chain([new Job6, new Job7])
    ->through([new Middleware2]) // middleware for Job1-3, Job6-7
    ->dispatch();

Metadata

Before we start, you may want to know that Relay doesn't modify job_batches table to store metadata. All data is stored inside the name column and limited to 255 chars. Here is how the name of the batch may look like with the metadata:

Cleaning up|[project:58][project.update:58][3/3]

Now, let's see how to use meta method to store additional information:

use Agatanga\Relay\Facades\Relay;

Relay::chain([
        new DownloadSources($project),
        new DetectSettings($project),
    ])
    ->then([
        new ReadStringFiles($project),
        new ReadSourceFiles($project),
    ])
    ->finally([
        new IgnoreKnownStrings($project),
        new RemoveSources($project),
    ])
    ->name('Update Project (:current of :total)')
    ->meta('project.update', $project->id)
    ->meta('causer', auth()->user()->id)
    ->dispatch();

Then search for the batch and retrieve metadata value or name of the batch:

use Agatanga\Relay\Facades\Relay;

Relay::whereMeta('causer', $userId)->all();
Relay::whereMeta('project', $id)->first()->meta('causer');
Relay::whereMeta('project.update', $id)->first()->name; // returns clean name

Progress

Let's assume that the search query from the section above returned the first batch (then and finally callbacks are not yet started). Relay takes this into account and will return the progress within 0-33% range.

use Agatanga\Relay\Facades\Relay;

Relay::whereMeta('project.update', $id)->first()->progress; // only the last callback can return 100%

Failed Jobs

When batch job fails, Laravel adds a failed job record to the failed_jobs table.

Relay allows you to retrieve these failed jobs:

use Agatanga\Relay\Facades\Relay;

Relay::whereMeta('project.update', $id)->first()->failedJobs();

// or get the exception string of the last failed job

$batch = Relay::whereMeta('project.update', $id)->first();

if ($batch->failed) {
    echo $batch->exception;
}