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PHPProcessManager <PHP>

A PHP Process manager.

Maintains:

  • A single “primary” PHP instance that’s never killed – it contains the reference filesystem used by all other PHP instances.
  • A pool of disposable PHP instances that are spawned to handle a single request and reaped immediately after.

When a new request comes in, PHPProcessManager yields the idle instance to handle it, and immediately starts initializing a new idle instance. In other words, for n concurrent requests, there are at most n+1 PHP instances running at the same time.

A slight nuance is that the first idle instance is not initialized until the first concurrent request comes in. This is because many use-cases won’t involve parallel requests and, for those, we can avoid eagerly spinning up a second PHP instance.

This strategy is inspired by Cowboy, an Erlang HTTP server. Handling a single extra request can happen immediately, while handling multiple extra requests requires extra time to spin up a few PHP instances. This is a more resource-friendly tradeoff than keeping 5 idle instances at all times.

Implements

  • AsyncDisposable

Index

Constructors

Methods

Constructors

constructor

Methods

[asyncDispose]

  • [asyncDispose](): Promise<void>

  • Returns Promise<void>

acquirePHPInstance

  • Get a PHP instance.

    It could be either the primary PHP instance, an idle disposable PHP instance, or a newly spawned PHP instance – depending on the resource availability.

    @throws

    when the maximum number of PHP instances is reached and the waiting timeout is exceeded.

    Returns Promise<SpawnedPHP<PHP>>

getPrimaryPhp

  • getPrimaryPhp(): Promise<PHP>

  • Get the primary PHP instance.

    If the primary PHP instance is not set, it will be spawned using the provided phpFactory.

    @throws

    when called twice before the first call is resolved.

    Returns Promise<PHP>