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Go Patterns
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Creational Patterns
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Abstract Factory
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Builder
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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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<a href="../#behavioral-patterns">
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Behavioral Patterns
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<li class="chapter " data-level="1.1.3.1" data-path="chain_of_responsibility.md">
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Chain of Responsibility
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</a>
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Command
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<span>
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Mediator
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Memento
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</a>
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Observer
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<li class="chapter " data-level="1.1.3.6" data-path="registry.md">
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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="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="strategy.html">
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<a href="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="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="visitor.md">
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<span>
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Visitor
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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="../messaging/fan_in.html">
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<a href="../messaging/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="../messaging/fan_out.html">
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<a href="../messaging/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="../messaging/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 " data-level="1.1.6.4" data-path="../messaging/publish_subscribe.html">
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<a href="../messaging/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="../messaging/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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<li class="chapter " data-level="1.1.7.6" data-path="../stability/steady_state.md">
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<span>
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Steady-State
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Profiling Patterns
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Timing Functions
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</a>
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Idioms
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Functional Options
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Anti-Patterns
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<ul class="articles">
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<span>
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Cascading Failures
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<li class="chapter " data-level="1.2" data-path="../CONTRIBUTING.html">
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Contributing
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Published with GitBook
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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=".." >Observer</a>
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</h1>
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</div>
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<section class="normal markdown-section">
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<h1 id="observer-pattern">Observer Pattern</h1>
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<p>The <a href="https://en.wikipedia.org/wiki/Observer_pattern" target="_blank">observer pattern</a> allows a type instance to "publish" events to other type instances ("observers") who wish to be updated when a particular event occurs.</p>
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<h2 id="implementation">Implementation</h2>
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<p>In long-running applications—such as webservers—instances can keep a collection of observers that will receive notification of triggered events.</p>
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<p>Implementations vary, but interfaces can be used to make standard observers and notifiers:</p>
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<pre><code class="lang-go"><span class="hljs-keyword">type</span> (
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<span class="hljs-comment">// Event defines an indication of a point-in-time occurrence.</span>
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Event <span class="hljs-keyword">struct</span> {
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<span class="hljs-comment">// Data in this case is a simple int, but the actual</span>
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<span class="hljs-comment">// implementation would depend on the application.</span>
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Data <span class="hljs-keyword">int64</span>
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}
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<span class="hljs-comment">// Observer defines a standard interface for instances that wish to list for</span>
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<span class="hljs-comment">// the occurrence of a specific event.</span>
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Observer <span class="hljs-keyword">interface</span> {
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<span class="hljs-comment">// OnNotify allows an event to be "published" to interface implementations.</span>
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<span class="hljs-comment">// In the "real world", error handling would likely be implemented.</span>
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OnNotify(Event)
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}
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<span class="hljs-comment">// Notifier is the instance being observed. Publisher is perhaps another decent</span>
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<span class="hljs-comment">// name, but naming things is hard.</span>
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Notifier <span class="hljs-keyword">interface</span> {
|
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<span class="hljs-comment">// Register allows an instance to register itself to listen/observe</span>
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<span class="hljs-comment">// events.</span>
|
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Register(Observer)
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<span class="hljs-comment">// Deregister allows an instance to remove itself from the collection</span>
|
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<span class="hljs-comment">// of observers/listeners.</span>
|
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Deregister(Observer)
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<span class="hljs-comment">// Notify publishes new events to listeners. The method is not</span>
|
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<span class="hljs-comment">// absolutely necessary, as each implementation could define this itself</span>
|
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<span class="hljs-comment">// without losing functionality.</span>
|
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Notify(Event)
|
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}
|
|
)
|
|
</code></pre>
|
|
<h2 id="usage">Usage</h2>
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|
<p>For usage, see <a href="observer/main.go">observer/main.go</a> or <a href="https://play.golang.org/p/cr8jEmDmw0" target="_blank">view in the Playground</a>.</p>
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