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Go Patterns
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Creational Patterns
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Abstract Factory
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Factory Method
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Object Pool
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Singleton
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Structural Patterns
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Bridge
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Composite
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<a href="../structural/decorator.html">
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Decorator
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Facade
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Flyweight
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Proxy
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Behavioral Patterns
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Chain of Responsibility
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Command
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<span>
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Mediator
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Memento
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Observer
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<span>
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Registry
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</a>
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<li class="chapter " data-level="1.1.3.7" data-path="../behavioral/state.md">
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<span>
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State
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</a>
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</li>
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<li class="chapter " data-level="1.1.3.8" data-path="../behavioral/strategy.html">
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<a href="../behavioral/strategy.html">
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Strategy
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</a>
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</li>
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<li class="chapter " data-level="1.1.3.9" data-path="../behavioral/template.md">
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<span>
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Template
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</a>
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</li>
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<li class="chapter " data-level="1.1.3.10" data-path="../behavioral/visitor.md">
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<span>
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Visitor
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.1.4" data-path="../">
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<a href="../#synchronization-patterns">
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Synchronization Patterns
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.1.4.1" data-path="../synchronization/condition_variable.md">
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<span>
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Condition Variable
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</a>
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</li>
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<li class="chapter " data-level="1.1.4.2" data-path="../synchronization/mutex.md">
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<span>
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Lock/Mutex
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</a>
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</li>
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<li class="chapter " data-level="1.1.4.3" data-path="../synchronization/monitor.md">
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<span>
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Monitor
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</a>
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</li>
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<li class="chapter " data-level="1.1.4.4" data-path="../synchronization/read_write_lock.md">
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<span>
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Read-Write Lock
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</a>
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</li>
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<li class="chapter " data-level="1.1.4.5" data-path="../synchronization/semaphore.html">
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<a href="../synchronization/semaphore.html">
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Semaphore
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.1.5" data-path="../">
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<a href="../#concurrency-patterns">
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Concurrency Patterns
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.1.5.1" data-path="../concurrency/barrier.md">
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<span>
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N-Barrier
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.2" data-path="../concurrency/bounded_parallelism.html">
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<a href="../concurrency/bounded_parallelism.html">
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Bounded Parallelism
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.3" data-path="../concurrency/broadcast.md">
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<span>
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Broadcast
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.4" data-path="../concurrency/coroutine.md">
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<span>
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Coroutines
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.5" data-path="../concurrency/generator.html">
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<a href="../concurrency/generator.html">
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Generators
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.6" data-path="../concurrency/reactor.md">
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<span>
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Reactor
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.7" data-path="../concurrency/parallelism.html">
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<a href="../concurrency/parallelism.html">
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Parallelism
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</a>
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</li>
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<li class="chapter " data-level="1.1.5.8" data-path="../concurrency/producer_consumer.md">
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<span>
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Producer Consumer
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.1.6" data-path="../">
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<a href="../#messaging-patterns">
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Messaging Patterns
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.1.6.1" data-path="fan_in.html">
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<a href="fan_in.html">
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Fan-In
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</a>
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</li>
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<li class="chapter " data-level="1.1.6.2" data-path="fan_out.html">
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<a href="fan_out.html">
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Fan-Out
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</a>
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</li>
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<li class="chapter " data-level="1.1.6.3" data-path="futures_promises.md">
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<span>
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Futures & Promises
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</a>
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</li>
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<li class="chapter active" data-level="1.1.6.4" data-path="publish_subscribe.html">
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<a href="publish_subscribe.html">
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Publish/Subscribe
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</a>
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</li>
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<li class="chapter " data-level="1.1.6.5" data-path="push_pull.md">
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<span>
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Push & Pull
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="1.1.7" data-path="../">
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<a href="../#stability-patterns">
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Stability Patterns
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</a>
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<ul class="articles">
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<li class="chapter " data-level="1.1.7.1" data-path="../stability/bulkhead.md">
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<span>
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Bulkheads
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</a>
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</li>
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<li class="chapter " data-level="1.1.7.2" data-path="../stability/circuit-breaker.html">
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<a href="../stability/circuit-breaker.html">
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Circuit-Breaker
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</a>
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</li>
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<li class="chapter " data-level="1.1.7.3" data-path="../stability/deadline.md">
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<span>
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Deadline
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</a>
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</li>
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<li class="chapter " data-level="1.1.7.4" data-path="../stability/fail_fast.md">
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<span>
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Fail-Fast
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</a>
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</li>
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<li class="chapter " data-level="1.1.7.5" data-path="../stability/handshaking.md">
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<span>
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Handshaking
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</a>
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</li>
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Steady-State
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Profiling Patterns
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Timing Functions
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Idioms
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Anti-Patterns
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Publish/Subscribe</a>
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</h1>
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</div>
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<div class="page-wrapper" tabindex="-1" role="main">
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<div class="page-inner">
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<section class="normal markdown-section">
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<h1 id="publish--subscribe-messaging-pattern">Publish & Subscribe Messaging Pattern</h1>
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<p>Publish-Subscribe is a messaging pattern used to communicate messages between
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different components without these components knowing anything about each other's identity.</p>
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<p>It is similar to the Observer behavioral design pattern.
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The fundamental design principals of both Observer and Publish-Subscribe is the decoupling of
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those interested in being informed about <code>Event Messages</code> from the informer (Observers or Publishers).
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Meaning that you don't have to program the messages to be sent directly to specific receivers.</p>
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<p>To accomplish this, an intermediary, called a "message broker" or "event bus",
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receives published messages, and then routes them on to subscribers.</p>
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<p>There are three components <strong>messages</strong>, <strong>topics</strong>, <strong>users</strong>.</p>
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<pre><code class="lang-go"><span class="hljs-keyword">type</span> Message <span class="hljs-keyword">struct</span> {
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<span class="hljs-comment">// Contents</span>
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}
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<span class="hljs-keyword">type</span> Subscription <span class="hljs-keyword">struct</span> {
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ch <span class="hljs-keyword">chan</span><- Message
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Inbox <span class="hljs-keyword">chan</span> Message
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}
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<span class="hljs-keyword">func</span> (s *Subscription) Publish(msg Message) error {
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<span class="hljs-keyword">if</span> _, ok := <-s.ch; !ok {
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<span class="hljs-keyword">return</span> errors.New(<span class="hljs-string">"Topic has been closed"</span>)
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}
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s.ch <- msg
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<span class="hljs-keyword">return</span> <span class="hljs-literal">nil</span>
|
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}
|
|
</code></pre>
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<pre><code class="lang-go"><span class="hljs-keyword">type</span> Topic <span class="hljs-keyword">struct</span> {
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Subscribers []Session
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MessageHistory []Message
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}
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<span class="hljs-keyword">func</span> (t *Topic) Subscribe(uid <span class="hljs-keyword">uint64</span>) (Subscription, error) {
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<span class="hljs-comment">// Get session and create one if it's the first</span>
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<span class="hljs-comment">// Add session to the Topic & MessageHistory</span>
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<span class="hljs-comment">// Create a subscription</span>
|
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}
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<span class="hljs-keyword">func</span> (t *Topic) Unsubscribe(Subscription) error {
|
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<span class="hljs-comment">// Implementation</span>
|
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}
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<span class="hljs-keyword">func</span> (t *Topic) Delete() error {
|
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<span class="hljs-comment">// Implementation</span>
|
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}
|
|
</code></pre>
|
|
<pre><code class="lang-go"><span class="hljs-keyword">type</span> User <span class="hljs-keyword">struct</span> {
|
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ID <span class="hljs-keyword">uint64</span>
|
|
Name <span class="hljs-keyword">string</span>
|
|
}
|
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|
|
<span class="hljs-keyword">type</span> Session <span class="hljs-keyword">struct</span> {
|
|
User User
|
|
Timestamp time.Time
|
|
}
|
|
</code></pre>
|
|
<h1 id="improvements">Improvements</h1>
|
|
<p>Events can be published in a parallel fashion by utilizing stackless goroutines.</p>
|
|
<p>Performance can be improved by dealing with straggler subscribers
|
|
by using a buffered inbox and you stop sending events once the inbox is full.</p>
|
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</section>
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