SOA with PHP and Symfony

• Service-oriented architecture
• Communication over protocol (typically
network)
• Reusable components
• Services are a „black box” for a clients
• Each component is independent and self-
contained

• E-learning platform for primary school
• Addition to books
• Teaching by playing
– Gamification
– Team working
– Personalization (dynamic avatars)
– Virtual currency

• Producer send message to RabbitMQ server
• Consumer can pick up selected messages
• Consumers are run in CLI
• Consumers can be run in different modes
• We are running consumers in endless loop

Problem: We have fixed date when project will
go live but team wants to work in Agile
methodology.
Solution: Spend few days/weeks for analysing
requirements and plan all sprints to the
deadline.

Problem: Data consistency between all
independent and self-contained components
Solution:
- Advanced Message Queuing Protocol. We have used RabbitMQ
- Communication with components using their external interface
- Using cron jobs for clearing data at nights
- Ignore this, it's not always important and critical for your application
Improve/explore : ESB - Enterprise Service Bus

Problem: How to generate reports based on two
or more self-contained components?
Solution: RabbitMQ

Problem: How to test all components? What about
integration tests of our orchestration level?
Solution:
• PHPUnit in components (mock external components)
• Automated tests written by our testers in SOAP UI
Improve:
• More tests 
• Behat
• PHPSpec

Problem: Performance of the whole application
doesn’t satisfy us
Solution:
• Disable unused components like: Session, Security
• Disable Doctrine logging
• Proper configuration of Symfony logger
• Always use Composer class loading optimization
• Too many listeners on HTTP requests
• Use APC, Xcache or any other PHP accelerator
• Use ApcClassLoader or XcacheClassLoader
• HTTP cache (Varnish)

Problem: Processing of messages was very slow
and memory leaks in consumers.
Solution: Clean up after yourself
• Use unset() method
• Doctrine methods: free(), detach(), clear()

Problem: MySQL errors:
• 2013: Lost connection to MySQL server
• 2006: MySQL server has gone away
• 2003: Can't connect to MySQL server
Solution: Catch all those exceptions and try to
reconnect to the database server. We have set
up also some timeout between all retries.

Problem: Can I trust consumer scripts? What with
situation when consumer will have problem with
connection with database etc. Exception is thrown
and message can be lost.
Solution:
• Creat failover files
• Catch all exceptions
• Log message into that file.
• Create mechanism for processing failed messages

Problem: We are using Memcached but QPS
(Query Per Second) of the MySQL server doesn't
satisfy us
Solution: Configure read/write split in your
database and prepare separate connections in
your application

Problem: Performance of the database layer still doesn’t
satisfy us
Solution: Monitor database queries during development
How:
• Use Symfony profiler
• Log all database queries to the temporary file on your
dev environment. Then use „tail –f” command to
monitor all queries during requests
• Use EXPLAIN on more complicated queries

Problem: Doctrine performance is unsatisfactory.
Moreover Doctrine create many unnecessary queries.
Solution:
• Use DQL instead Doctrine findAll() method
• Use native query for more complicated queries
• Avoid entity mapping when it’s not necessary
(hydration mode)
• Use „extra lazy” fetching strategy for associations
• For big collections fetch only necessary fields

Problem: How to monitor application? How detect
problems before they will become a serious?
Solution: Monitoring software
• New Relic
• Nagios
Improve: Logstash + Kibana + Elasticsearch

• Symfony 2.3
• PHPUnit
• SoapUI
• RabbitMQ
• MySQL (Percona)
• Elasticsearch
• Jenkins
• Memcached
• Nagios
• New Relic

• First project on new framework
• First use of Doctrine

• Run all Symfony2 console commands with --env=prod parameter
• Write your own wrappers to all main external libraries
• Use Vagrant or Docker
• Run load tests on filled database
• Automate your processes (ie. Ant + Jenkins)
• Add created_date and modified_date to all tables (use MySQL triggers)

SOA with PHP and Symfony

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