JarCastingvertx-redisques
A highly scalable redis-persistent queuing system for vert.x.
Getting Started
Install
- Clone this repository or unzip archive
- Install and start Redis
Build
You need Java 8 and Maven.
cd vertx-redisques
mvn clean install
Dynamic Queues
They are stored as redis lists, thus created only when needed and removed when empty. There is nothing left even if you just used thousands of queues with thousands of messages.
Smart Consuming
It is guaranteed that a queue is consumed by the same RedisQuesVerticle instance (a consumer). If no consumer is registered for a queue, one is assigned (this uses redis setnx to ensure only one is assigned). When idle for a given time, a consumer is removed. This prevents subscription leaks and makes recovering automatic when a consumer dies.
Safe Distribution
There is no single point of control/failure. Just create many instances of RedisQues, they will work together. If an instance dies, its queues will be assigned to other instances.
Configuration
The following configuration values are available:
| Property | Default value | Description |
|---|---|---|
| address | redisques | The eventbus address the redisques module is listening to |
| configuration-updated-address | redisques-configuration-updated | The eventbus address the redisques module publishes the configuration updates to |
| redis-prefix | redisques: | Prefix for redis keys holding queues and consumers |
| processor-address | redisques-processor | Address of message processors |
| refresh-period | 10 | The frequency [s] of consumers refreshing their subscriptions to consume |
| processorDelayMax | 0 | The maximum delay [ms] to wait between queue items before notify the consumer |
| redisHost | localhost | The host where redis is running on |
| redisPort | 6379 | The port where redis is running on |
| redisEncoding | UTF-8 | The encoding to use in redis |
| checkInterval | 60 | The interval [s] to check timestamps of not-active / empty queues by executing check queue operation. checkInterval value must be greater 0, otherwise the default is used. |
| httpRequestHandlerEnabled | false | Enable / disable the HTTP API |
| httpRequestHandlerPrefix | /queuing | The url prefix for all HTTP API endpoints |
| httpRequestHandlerPort | 7070 | The port of the HTTP API |
| httpRequestHandlerUserHeader | x-rp-usr | The name of the header property where the user information is provided. Used for the HTTP API |
Configuration util
The configurations have to be passed as JsonObject to the module. For a simplified configuration the RedisquesConfigurationBuilder can be used.
Example:
RedisquesConfiguration config = RedisquesConfiguration.with()
.redisHost("anotherhost")
.redisPort(1234)
.build();
JsonObject json = config.asJsonObject();
Properties not overridden will not be changed. Thus remaining default.
To use default values only, the RedisquesConfiguration constructor without parameters can be used:
JsonObject json = new RedisquesConfiguration().asJsonObject();
RedisQues APIs
Redisques API for Vert.x - Eventbus
Evenbus Settings:
address = redisque
RedisquesAPI util
For a simplified working with the Redisques module, see the RedisquesAPI class:
org.swisspush.redisques.util.RedisquesAPI
This class provides utility methods for a simple configuration of the queue operations. See Queue operations chapter below for details.
Queue operations
The following operations are available in the Redisques module.
getConfiguration
Request Data
{
"operation": "getConfiguration"
}
Response Data
{
"status": "ok" / "error",
"value": <obj RESULT>
}
setConfiguration
Request Data
{
"operation": "setConfiguration",
"payload": {
"<str propertyName>": <str propertyValue>,
"<str property2Name>": <str property2Value>,
"<str property3Name>": <str property3Value>
}
}
Response Data
{
"status": "ok" / "error",
"message": <string error message when status=error>
}
enqueue
Request Data
{
"operation": "enqueue",
"payload": {
"queuename": <str QUEUENAME>
},
"message": {
"method": "POST",
"uri": <st REQUEST URI>,
"payload": null
}
}
Response Data
{
"status": "ok" / "error",
"message": "enqueued" / <str RESULT>
}
lockedEnqueue
Request Data
{
"operation": "lockedEnqueue",
"payload": {
"queuename": <str QUEUENAME>,
"requestedBy": <str user who created the lock>
},
"message": {
"method": "POST",
"uri": <st REQUEST URI>,
"payload": null
}
}
Response Data
{
"status": "ok" / "error",
"message": "enqueued" / <str RESULT>
}
getQueues
Request Data
{
"operation": "getQueues"
}
Response Data
{
"status": "ok" / "error",
"value": <objArr RESULT>
}
getQueuesCount
Request Data
{
"operation": "getQueuesCount",
"payload": {
"filter": <str regex pattern to filter queues to count (optional)>
}
}
Response Data
{
"status": "ok" / "error",
"value": <long RESULT>
}
getQueueItemsCount
Request Data
{
"operation": "getQueueItemsCount",
"payload": {
"queuename": <str QUEUENAME>
}
}
Response Data
{
"status": "ok" / "error",
"value": <long RESULT>
}
check
Request Data
{
"operation": "check"
}
Response Data
{}
reset
Request Data
{
"operation": "reset"
}
Response Data
{}
stop
Request Data
{
"operation": "stop"
}
Response Data
{
"status": "ok" / "error"
}
getQueueItems
Request Data
{
"operation": "getQueueItems",
"payload": {
"queuename": <str QUEUENAME>,
"limit": <str LIMIT>
}
}
Response Data
{
"status": "ok" / "error",
"value": <objArr RESULT>,
"info": <nbrArray with result array (value property) size and total queue item count (can be greater than limit)>
}
addQueueItem
Request Data
{
"operation": "addQueueItem",
"payload": {
"queuename": <str QUEUENAME>,
"buffer": <str BUFFERDATA>
}
}
Response Data
{
"status": "ok" / "error"
}
getQueueItem
Request Data
{
"operation": "getQueueItem",
"payload": {
"queuename": <str QUEUENAME>,
"index": <int INDEX>
}
}
Response Data
{
"status": "ok" / "error",
"value": <obj RESULT>
}
replaceQueueItem
Request Data
{
"operation": "replaceQueueItem",
"payload": {
"queuename": <str QUEUENAME>,
"buffer": <str BUFFERDATA>,
"index": <int INDEX>
}
}
Response Data
{
"status": "ok" / "error"
}
deleteQueueItem
Request Data
{
"operation": "deleteQueueItem",
"payload": {
"queuename": <str QUEUENAME>,
"index": <int INDEX>
}
}
Response Data
{
"status": "ok" / "error"
}
deleteAllQueueItems
Request Data
{
"operation": "deleteAllQueueItems",
"payload": {
"queuename": <str QUEUENAME>,
"unlock": true/false
}
}
Response Data
{
"status": "ok" / "error",
"value": <long 1 when the queue was deleted, long 0 when no queue was found>
}
bulkDeleteQueues
Request Data
{
"operation": "bulkDeleteQueues",
"payload": {
"queues": <JsonArray queues to delete>
}
}
Response Data
{
"status": "ok" / "error",
"value": <Long Amount of deleted queues>
}
getAllLocks
Request Data
{
"operation": "getAllLocks",
"payload": {
"filter": <str regex pattern to filter locks (optional)>
}
}
Response Data
{
"status": "ok" / "error",
"value": <obj RESULT>
}
putLock
Request Data
{
"operation": "putLock",
"payload": {
"queuename": <str QUEUENAME>,
"requestedBy": <str user who created the lock>
}
}
Response Data
{
"status": "ok" / "error"
}
bulkPutLocks
Request Data
{
"operation": "bulkPutLocks",
"payload": {
"locks": <JsonArray locks to add>,
"requestedBy": <str user who created the locks>
}
}
Response Data
{
"status": "ok" / "error"
}
getLock
Request Data
{
"operation": "getLock",
"payload": {
"queuename": <str QUEUENAME>
}
}
Response Data
{
"status": "ok" / "error",
"value": <obj RESULT>
}
deleteLock
Request Data
{
"operation": "deleteLock",
"payload": {
"queuename": <str QUEUENAME>
}
}
Response Data
{
"status": "ok" / "error"
}
bulkDeleteLocks
Request Data
{
"operation": "bulkDeleteLocks",
"payload": {
"locks": <JsonArray locks to delete>
}
}
Response Data
{
"status": "ok" / "error",
"value": <Long Amount of deleted locks>
}
deleteAllLocks
Request Data
{
"operation": "deleteAllLocks"
}
Response Data
{
"status": "ok" / "error",
"value": <Long Amount of deleted locks>
}
RedisQues HTTP API
RedisQues provides a HTTP API to modify queues, queue items and get information about queue counts and queue item counts.
Configuration
To enable the HTTP API, the httpRequestHandlerEnabled configuration property has to be set to TRUE.
For additional configuration options relating the HTTP API, see the Configuration section.
API Endpoints
The following request examples will use a configured prefix of /queuing
List endpoints
To list the available endpoints use
GET /queuing
The result will be a json object with the available endpoints like the example below
{
"queuing": [
"locks/",
"queues/",
"monitor/",
"configuration/"
]
}
Get configuration
The configuration information contains the currently active configuration values. To get the configuration use
GET /queuing/configuration
The result will be a json object with the configuration values like the example below
{
"redisHost": "localhost",
"checkInterval": 10,
"address": "redisques",
"configuration-updated-address": "redisques-configuration-updated",
"httpRequestHandlerEnabled": true,
"redis-prefix": "redisques:",
"processorTimeout": 240000,
"processorDelayMax": 0,
"refresh-period": 10,
"httpRequestHandlerPrefix": "/queuing",
"redisEncoding": "UTF-8",
"httpRequestHandlerPort": 7070,
"httpRequestHandlerUserHeader": "x-rp-usr",
"redisPort": 6379,
"processor-address": "redisques-processor"
}
Set configuration
To set the configuration use
POST /queuing/configuration
having the payload in the request body. The current implementation supports the following configuration values only:
{
"processorDelayMax": 0 // number value in milliseconds
}
The following conditions will cause a 400 Bad Request response with a corresponding error message:
- Body is not a valid json object
- Body contains not supported configuration values
- Body does not contain the processorDelayMax property
Get monitor information
The monitor information contains the active queues and their queue items count. To get the monitor information use
GET /queuing/monitor
Available url parameters are:
- limit: The maximum amount of queues to list
- emptyQueues=true: Also show empty queues
The result will be a json object with the monitor information like the example below
{
"queues": [
{
"name": "queue_1",
"size": 3
},
{
"name": "queue_2",
"size": 2
}
]
}
Enqueue
To enqueue a new queue use
PUT /queuing/enqueue/myNewQueue
having the payload in the request body. When the request body is not a valid json object, a statusCode 400 with the error message 'Bad Request' will be returned.
Available url parameters are:
- locked=true: Lock the queue before enqueuing to prevent processing
When the locked=true url parameter is set, the configured httpRequestHandlerUserHeader property will be used to define the user which requested the lock. If no header is provided, "Unknown" will be used instead.
List or count queues
To list the active queues use
GET /queuing/queues
Available url parameters are:
- filter=: Filter the queues to list or count
The result will be a json object with a list of active queues like the example below
{
"queues": [
"queue_1",
"queue_2",
"queue_3"
]
}
Attention: The result will also contain empty queues when requested before the internal cleanup has passed. Use the monitor endpoint when non-empty queues should be listed only.
To get the count of active queues only, use
GET /queuing/queues?count=true
The result will be a json object with the count of active queues like the example below
{
"count": 3
}
Attention: The count will also contain empty queues when requested before the internal cleanup has passed. Use the monitor endpoint when non-empty queues should be counted only.
List or count queue items
To list the queue items of a single queue use
GET /queuing/queues/myQueue
Add the limit url parameter to define the maximum amount of queue items to retrieve
The result will be a json object with a list of queue items like the example below
{
"myQueue": [
"queueItem1",
"queueItem2",
"queueItem3",
"queueItem4"
]
}
To get the count of queue items only, use
GET /queuing/queues/myQueue?count=true
The result will be a json object with the count of queue items like the example below
{
"count": 4
}
Delete all queue items
To delete all queue items of a single queue use
DELETE /queuing/queues/myQueue
The result will be a statusCode 200 OK when the queue could be successfully deleted or a 404 Not Found when the queue did not exist. Any error will result in a statusCode 500 Internal Server Error.
Available url parameters are:
- unlock=true: Unlock the queue after deleting all queue items
Bulk delete queues
To delete a custom subset of existing queues use
POST /queuing/queues?bulkDelete=true
The payload must contain an array with the queues to delete.
Example:
{
"queues": [
"queue1",
"queue2"
]
}
The result will be a json object containing the number of deleted queues like the example below
{
"deleted": 2
}
Get single queue item
To get a single queue item use
GET /queuing/queues/myQueue/0
The result will be a json object representing the queue item at the given index (0 in the example above). When no queue item at the given index exists, a statusCode 404 with the error message 'Not Found' will be returned.
Replace single queue item
To replace a single queue item use
PUT /queuing/queues/myQueue/0
having the payload in the request body. The queue must be locked to perform this operation, otherwise a statusCode 409 with the error message 'Queue must be locked to perform this operation' will be returned. When no queue item at the given index exists, a statusCode 404 with the error message 'Not Found' will be returned.
Delete single queue item
To delete a single queue item use
DELETE /queuing/queues/myQueue/0
The queue must be locked to perform this operation, otherwise a statusCode 409 with the error message 'Queue must be locked to perform this operation' will be returned. When no queue item at the given index exists, a statusCode 404 with the error message 'Not Found' will be returned.
Add queue item
To add a queue item (to the end of the queue) use
POST /queuing/queues/myQueue/
having the payload in the request body. When the request body is not a valid json object, a statusCode 400 with the error message 'Bad Request' will be returned.
Get all locks
To list all existing locks use
GET /queuing/locks/
Available url parameters are:
- filter=: Filter the locks to return
The result will be a json object with a list of all locks like the example below
{
"locks": [
"queue1",
"queue2"
]
}
Add lock
To add a lock use
PUT /queuing/locks/myQueue
having an empty json object {} in the body. The configured httpRequestHandlerUserHeader property will be used to define the user which requested the lock. If no header is provided, "Unknown" will be used instead.
Bulk add locks
To add multiple locks use
POST /queuing/locks
The payload must contain an array with the locks to add.
Example:
{
"locks": [
"queue1",
"queue2"
]
}
Get single lock
To get a single lock use
GET /queuing/locks/queue1
The result will be a json object with the lock information like the example below
{
"requestedBy": "someuser",
"timestamp": 1478100330698
}
Delete single lock
To delete a single lock use
DELETE /queuing/locks/queue1
Bulk delete locks
To delete a custom subset of existing locks use
POST /queuing/locks?bulkDelete=true
The payload must contain an array with the locks to delete.
Example:
{
"locks": [
"queue1",
"queue2"
]
}
The result will be a json object containing the number of deleted locks like the example below
{
"deleted": 2
}
Delete all locks
To delete all existing locks use
DELETE /queuing/locks
The result will be a json object containing the number of deleted locks like the example below
{
"deleted": 22
}
Dependencies
Redisques versions greater than 01.00.17 depend on Vert.x v3.2.0 and therefore require Java 8.
