README

This package provides an interface for defining cache strategies that help determine which database queries should be cached.

Features

• Simple interface for implementing custom cache strategies
• Built-in NoCacheStrategy implementation for basic usage
• Symfony DependencyInjection integration with autoconfiguration support
• No external dependencies other than Symfony DependencyInjection
• Compatible with PHP 8.1 and above

Installation

You can install this package using Composer:

composer require tourze/cache-strategy

Requirements

• PHP 8.1 or higher
• Symfony DependencyInjection 6.4 or higher

Quick Start

The core of this package is the CacheStrategy interface which provides a method to determine whether a query should be cached:

<?php

use Tourze\CacheStrategy\CacheStrategy;

// Using the included NoCacheStrategy which caches all queries
$strategy = new \Tourze\CacheStrategy\NoCacheStrategy();

// Query and parameters
$query = "SELECT * FROM users WHERE status = ?";
$params = ['active'];

// Determine if the query should be cached
if ($strategy->shouldCache($query, $params)) {
    // Cache the query result
}

Usage

CacheStrategy Interface

The CacheStrategy interface has a single method:

public function shouldCache(string $query, array $params): bool;

This method takes a query string and parameter array, returning a boolean indicating whether the query should be cached.

Predefined Strategies

The package includes one predefined strategy:

• NoCacheStrategy: A simple strategy that always returns true, indicating all queries should be cached.

Custom Strategies

You can create your own cache strategies by implementing the CacheStrategy interface:

<?php

namespace App\Cache;

use Tourze\CacheStrategy\CacheStrategy;

class SelectQueryStrategy implements CacheStrategy
{
    public function shouldCache(string $query, array $params): bool
    {
        // Only cache SELECT queries
        return str_starts_with(strtoupper(trim($query)), 'SELECT');
    }
}

Symfony Integration

The CacheStrategy interface is marked with Symfony's AutoconfigureTag attribute, making it automatically configured as a service with the tag doctrine.cache.entity_cache_strategy:

#[AutoconfigureTag(CacheStrategy::SERVICE_TAG)]
interface CacheStrategy
{
    const SERVICE_TAG = 'doctrine.cache.entity_cache_strategy';
    // ...
}

This allows you to use dependency injection to collect all cache strategy services in your application.

Best Practices

• Create specific cache strategies for different types of queries
• Consider performance implications when implementing complex cache strategies
• Use different strategies for read and write operations
• Test your strategies with real-world query patterns

Testing

The package includes unit tests. To run the tests:

./vendor/bin/phpunit packages/cache-strategy/tests

License

This package is licensed under the MIT License - see the LICENSE file for details.