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RapidMQ

RapidMQ is a pure, extremely productive, lightweight and reliable library for managing of the local messages queue in the Go programming language.

Installation

go get github.com/sybrexsys/RapidMQ/queue

Requirements

Need at least go1.4 or newer.

Usage

Queue

Base structure in the base is Queue Queue is created with that function:

func CreateQueue(Name, StoragePath string, Log Logging, Factory WorkerFactory, Options *Options) (*Queue, error)

Parameters	Type	Description
Name	string	Queue name. Used for logging only
StoragePath	string	Path to the disk storages' files
Log	Logging	Interface is used to logging of the queue's events. If equal to nil, logging is ensent. Description bellow
Factory	WorkerFactory	Interface for abstract factory of the workers. Description bellow
Options	*Options	Options of the queue

func (q *Queue) Insert(buf []byte) bool

Appends the message into the queue. In depends of the timeout's option either is trying to write message to the disk or is trying to process this message in the memory and writing to the disk only if timeout is expired shortly. Returns false if aren't processing / writing of the message in the during of the timeout or has some problems with writing to disk

func (q *Queue) Process(worker WorkerID, isOk bool)

That function must be called from the worker of the message. In depends of the isOk parameter either messages are deleting from the queue or are marking as faulty and again processing after some timeout

func (q *Queue) Count() uint64

Returns the count of the messages in the queue

func (q *Queue) Close()

Stops the handler of the messages, saves the messages located in the memory into the disk, closes all opened files.

Message

Description of the structure that will be sent to worker

type Message struct {
	ID      StorageIdx
	Buffer  []byte
}

Member	Type	Description
ID	StorageIdx	ID of the message
Buffer	[]byte	Buffer with content of the message

WorkerFactory

Worker factory is a structure that create workers for processing messages Your factory must support next interface:

type WorkerFactory interface {
	CreateWorker() Worker
	NeedTimeoutProcessing() bool
}

CreateWorker() Worker

Creates new worker for this factory with unique ID

NeedTimeoutProcessing() bool

Returns true if possible used some messages in one action (for example, collect large SQL script from lot of the small messages)

Worker

If you are using of your worker, he must support next interface

type Worker interface {
	ProcessMessage(*Queue, *Message, chan Worker)
	ProcessTimeout(*Queue, chan Worker)
	GetID() WorkerID
	Close()
}

ProcessMessage(*Queue, *Message, chan Worker)

Processes message that is stored in *Message. After it the worker must call function (*Queue).Process with his unique identifier and with result of the processing, also must be pushed himself into chanal Worker

ProcessTimeout(*Queue, chan Worker)

Processing of the event when available messages is absent
After it the worker must call function (*Queue).Process with his unique identifier and with result of the processing, also must send himself into chanal Worker

GetID() WorkerID

Returns unique identifier of the worker

Close()

Close is called when queue is finishing work with worker. Here you can close connection to database or etc.

Logging

If you are using of your logging system, it must support next interface

type Logging interface {
	Trace(msg string, a ...interface{})
	Info(msg string, a ...interface{})
	Warning(msg string, a ...interface{})
	Error(msg string, a ...interface{})
}

Author

Vadim Shakun: vadim.shakun@gmail.com

License

RapidMQ is under the Apache 2.0 license. See the LICENSE file for details.