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2c903383b5
* Upgrade levelqueue to version 0.2.0 This adds functionality for Unique Queues * Add UniqueQueue interface and functions to create them * Add UniqueQueue implementations * Move TestPullRequests over to use UniqueQueue * Reduce code duplication * Add bytefifos * Ensure invalid types are logged * Fix close race in PersistableChannelQueue Shutdown
60 lines
1.4 KiB
Markdown
60 lines
1.4 KiB
Markdown
# levelqueue
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Level queue is a simple queue golang library base on go-leveldb.
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[](https://drone.gitea.com/lunny/levelqueue) [](http://gocover.io/gitea.com/lunny/levelqueue)
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[](https://goreportcard.com/report/gitea.com/lunny/levelqueue)
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## Installation
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```
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go get gitea.com/lunny/levelqueue
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```
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## Usage
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```Go
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queue, err := levelqueue.Open("./queue")
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err = queue.RPush([]byte("test"))
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// pop an element from left of the queue
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data, err = queue.LPop()
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// if handle success, element will be pop, otherwise it will be keep
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queue.LHandle(func(dt []byte) error{
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return nil
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})
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```
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You can now create a Set from a leveldb:
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```Go
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set, err := levelqueue.OpenSet("./set")
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added, err:= set.Add([]byte("member1"))
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has, err := set.Has([]byte("member1"))
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members, err := set.Members()
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removed, err := set.Remove([]byte("member1"))
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```
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And you can create a UniqueQueue from a leveldb:
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```Go
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queue, err := levelqueue.OpenUnique("./queue")
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err := queue.RPush([]byte("member1"))
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err = queue.LPush([]byte("member1"))
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// Will return ErrAlreadyInQueue
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// and so on.
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```
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## Creating Queues, UniqueQueues and Sets from already open DB
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If you have an already open DB you can create these from this using the
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`NewQueue`, `NewUniqueQueue` and `NewSet` functions. |