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Installation

composer require omnilog/psr6-dynamo-db-bundle

Configuration

Create the file config/packages/dynamo_db_cache.yaml and put at least the table name there:

Everything else has default values, though you probably want to also configure the dynamo db client.

Configuration options:

• replace_default_adapter - set to true to replace the default AdapterInterface and CacheInterface implementation with the adapter from this bundle (default: false)
• table - the table which will be used for storing the cache (required)
• client_service - The service that will be used as DynamoDB client, if not set this bundle will try to create one (more details in client_config option below) but the use is limited
• client_config - If no client_service is configured, it will be created from the values of this config. It contains two subkeys:
  • region - the AWS region (default: us-east-1)
  • version - the service version (default: latest)
  • no other options are available, if you need to configure more, please create and assign custom client_service
• encoder - contains the settings for encoders:
  • service - the service which will be used as the encoder
  • can be one of built-in services (omnilog.dynamo_cache.encoder.serialize, omnilog.dynamo_cache.encoder.json)
  • can be a custom service implementing the \Omnilog\DynamoDbCache\Encoder\CacheItemEncoderInterface interface
  • default value: omnilog.dynamo_cache.encoder.serialize
  • json_options - settings for the json encoder, ignored if another encoder is used
  • encode_flags - the same flags you would pass to json_encode()
  • decode_flags - the same flags you would pass to json_decode()
  • depth - the depth argument for both json_encode() and json_decode()
• primary_key_field - the name of the field that will be used as the primary key (default: id)
• ttl_field - the name of the field that will be used as the ttl field (default: ttl)
• value_field - the name of the field that will be used as the value field (default: value)
• key_prefix - the prefix used in front of the item keys (default: null which means none)

Autogenerated default config (via bin/console config:dump omnilog_dynamo_db_cache):

Usage

You can use one of the two available services:

• Omnilog\DynamoDbCache\DynamoDbCache - this one doesn't implement the Symfony AdapterInterface nor CacheInterface
• Omnilog\DynamoDbCacheBundle\Cache\DynamoDbCacheAdapter - this one implements the Symfony AdapterInterface and CacheInterface

If you set the replace_default_adapter to true you can also use these interfaces as services:

• Symfony\Component\Cache\Adapter\AdapterInterface - the Symfony interface for PSR-6 cache
• Symfony\Contracts\Cache\CacheInterface - the Symfony interface for simple cache
• Psr\Cache\CacheItemPoolInterface - the PSR-6 interface
• Psr\SimpleCache\CacheInterface - the PSR-16 interface

Example

While using the replace_default_adapter option:

Or using the PSR interfaces:

Converters

This bundle supports all instances of \Psr\Cache\CacheItemInterface with the use of converters which convert the object to \Omnilog\DynamoDbCache\DynamoCacheItem. Note that some information may be lost in the conversion, notably expiration date.

This bundle has a handler for the default Symfony \Symfony\Component\Cache\CacheItem where it retains also the information about expiration date.

If you use any other CacheItemInterface implementation, you may need to write your custom handler:

Your converter is now automatically registered in the converter system and will be used whenever you try to save an instance of MyCacheItem.

If you don't use autoconfiguration, tag your service with omnilog.dynamo_cache.converter

The default converter which will be used as last option can convert all CacheItemInterface objects but has no way to get the expiration date since the interface doesn't provide such information.