Go Patterns

A curated collection of idiomatic design & application patterns for Go language.

Creational Patterns:

Pattern	Description
TODO: Abstract Factory	Provides an interface for creating families of releated objects
TODO: Builder	Builds a complex object using simple objects
TODO: Factory Method	Defers instantiation of an object to a specialized function for creating instances
Object Pool	Instantiates and maintains a group of objects instances of the same type
Singleton	Restricts instantiation of a type to one object

Structural Patterns:

Pattern	Description
TODO: Adapter	Adapts otherwise incompatible interfaces to work together by adapting one to the other
TODO: Bridge	Decouples an interface from its implementation so that the two can vary independently
TODO: Composite	Encapsulates and provides access to a number of different objects
Decorator	Adds behavior to an object, statically or dynamically
TODO: Facade	Uses one type as an API to a number of others
TODO: Flyweight	Reuses existing instances of objects with similar/identical state to minimize resource usage
TODO: Model View Controller	Divides an app into three interconnected parts to separate internal representation from presentation to user
TODO: Proxy	Provides a surrogate for an object to control it's actions

Behavioral Patterns:

Pattern	Description
TODO: Chain of Responsibility	Avoids coupling a sender to receiver by giving more than object a chance to handle the request
TODO: Command	Bundles a command and arguments to call later
TODO: Mediator	Connects objects and acts as a proxy
TODO: Memento	Generate an opaque token that can be used to go back to a previous state
Observer	Provide a callback for notification of events/changes to data
TODO: Registry	Keep track of all subclasses of a given class
TODO: State	Encapsulates varying behavior for the same object based on its internal state
Strategy	Enables an algorithm's behavior to be selected at runtime
TODO: Template	Defines a skeleton class which defers some methods to subclasses
TODO: Visitor	Separates an algorithm from an object on which it operates

Synchronization Patterns:

Pattern	Description
TODO: Condition Variable	Provides a mechanism for threads to temporarily give up access in order to wait for some condition
TODO: Lock/Mutex	Enforces mutual exclusion limit on a resource to gain exclusive access
TODO: Monitor	Combination of mutex and condition variable patterns
TODO: Read-Write Lock	Allows parallel read access, but only exclusive access on write operations to a resource
Semaphore	Allows controlling access to a common resource

Concurrency Patterns:

Pattern	Description
TODO: N-Barrier	Prevents a process from proceeding until all N processes reach to the barrier
Bounded Parallelism	Completes large number of independent tasks with resource limits
TODO: Broadcast	Transfers a message to all recipients simultaneously
TODO: Coroutines	Subroutines that allow suspending and resuming execution at certain locations
TODO: Generators	Yields a sequence of values one at a time
TODO: Reactor	Demultiplexes service requests delivered concurrently to a service handler and dispatches them syncronously to the associated request handlers
Parallelism	Completes large number of independent tasks
TODO: Producer Consumer	Separates tasks from task executions
TODO: Scheduler	Orchestrates steps to be performed as part of a task

Messaging Patterns:

Pattern	Description
Fan-In	Funnels tasks to a work sink (e.g. server)
Fan-Out	Distributes tasks among workers (e.g. producer)
TODO: Futures & Promises	Acts as a place-holder of a result that is initially unknown for synchronization purposes
Publish/Subscribe	Passes information to a collection of recipients who subscribed to a topic
TODO: Push & Pull	Distributes messages to multiple workers, arranged in a pipeline

Stability Patterns:

Pattern	Description
TODO: Bulkheads	Enforces a principle of failure containment (i.e. prevents cascading failures)
Circuit-Breaker	Stops the flow of the requests when requests are likely to fail
TODO: Deadline	Allows clients to stop waiting for a response once the probability of response becomes low (e.g. after waiting 10 seconds for a page refresh)
TODO: Fail-Fast	Checks the availability of required resources at the start of a request and fails if the requirements are not satisfied
TODO: Handshaking	Asks a component if it can take any more load, if it can't the request is declined
TODO: Steady-State	For every service that accumulates a resource, some other service must recycle that resource

Profiling Patterns:

Pattern	Description
TODO: Timing Functions	Wraps a function and logs the execution

Idioms:

Pattern	Description
Functional Options	Allows creating clean APIs with sane defaults and idiomatic overrides

Anti-Patterns:

Pattern	Description
TODO: Cascading Failures	A failure in a system of interconnected parts in which the failure of a part causes a domino effect

Other Patterns:

Pattern	Description

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