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Zend Framework: Zend_Cache_Backend_MongoDb Component Proposal

Table of Contents

1. Overview

Zend_Cache_Backend_MongoDb is an extended Cache Backend supporting tags, automatic_cleaning, expire_read, infinite_lifetime and get_list functionality. By taking advantage of the speed, reliability and distributed features of MongoDb it is possible to employ advanced caching features in complex and fragmented environments.

2. References

• Zend_Cache_Backend_MongoDb
• MongoDb.org
• Mongo docs on php.net
• CappedCollections: Usage and Restrictions

3. Component Requirements, Constraints, and Acceptance Criteria

• This component will employ MongoDb as a storage engine for cached records.
• This component will support access via Zend_Cache_Manager
• This component will allow explicit declaration of the MongoDb object.
• This component will include a factory method.
• This component will support tagging.
• This component will automatic cleaning.
• This component will support infinite lifetime.
• This component will support tag and ID listing.
• This component will not support priority.

4. Dependencies on Other Framework Components

• MongoDb pecl extension
• Zend_Cache_Backend_ExtendedInterface
• Zend_Cache_Backend

5. Theory of Operation

This adapter functions in a similar manner as the sqlite backend; however by employing MongoDb as the storage engine we are no longer restricted to the file sytem and gain the benefits of replication and high availability in clustered/load-balanced environments.

6. Milestones / Tasks

• Milestone 1: [DONE] Develop the cache backend class.
• Milestone 2: [DONE] Develop and pass unit tests.
• Milestone 3: Incorporate feedback and change sets from review.
• Milestone 4: Write Documentation.

7. Class Index

• Zend_Cache_Backend_MongoDb
• MongoDb
• MongoCollection

8. Use Cases

9. Class Skeletons