SerializedMessageIndex.php
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SerializedMessageIndex.php
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	<?php
	declare( strict_types = 1 );

	namespace MediaWiki\Extension\Translate\MessageLoading;

	use MediaWiki\Extension\Translate\Utilities\Utilities;

	/**
	* Storage on serialized file.
	*
	* This serializes the whole array. Because this format can preserve
	* the values which are stored as references inside the array, this is
	* the most space efficient storage method and fastest when you want
	* the full index.
	*
	* Unfortunately when the size of index grows to about 50000 items, even
	* though it is only 3,5M on disk, it takes 35M when loaded into memory
	* and the loading can take more than 0,5 seconds. Because usually we
	* need to look up only few keys, it is better to use another backend
	* which provides random access - this backend doesn't support that.
	*/
	class SerializedMessageIndex extends MessageIndexStore {
	private ?array $index = null;
	private const FILENAME = 'translate_messageindex.ser';

	public function retrieve( bool $readLatest = false ): array {
	if ( $this->index !== null ) {
	return $this->index;
	}

	$file = Utilities::cacheFile( self::FILENAME );
	if ( file_exists( $file ) ) {
	$this->index = unserialize( file_get_contents( $file ) );
	} else {
	$this->index = [];
	}

	return $this->index;
	}

	public function store( array $array, array $diff ): void {
	$file = Utilities::cacheFile( self::FILENAME );
	file_put_contents( $file, serialize( $array ) );
	$this->index = $array;
	}
	}