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Storm RabbitMQ\n\n[![Build Status](https://travis-ci.org/burov4j/storm-rabbitmq.svg)](https://travis-ci.org/burov4j/storm-rabbitmq)\n[![codecov](https://codecov.io/gh/burov4j/storm-rabbitmq/branch/master/graph/badge.svg)](https://codecov.io/gh/burov4j/storm-rabbitmq)\n[![Maven Version](https://maven-badges.herokuapp.com/maven-central/ru.burov4j.storm/storm-rabbitmq/badge.svg)](http://search.maven.org/#search|gav|1|g:\"ru.burov4j.storm\"%20AND%20a:\"storm-rabbitmq\")\n\nProvides implementations of [IRichSpout](https://storm.apache.org/releases/1.2.2/javadocs/org/apache/storm/topology/IRichSpout.html) and [IRichBolt](https://storm.apache.org/releases/1.2.2/javadocs/org/apache/storm/topology/IRichBolt.html) for [RabbitMQ](https://www.rabbitmq.com/).\n\n## Maven\n\n```xml\n\u003cdependency\u003e\n    \u003cgroupId\u003eru.burov4j.storm\u003c/groupId\u003e\n    \u003cartifactId\u003estorm-rabbitmq\u003c/artifactId\u003e\n    \u003cversion\u003e1.0.1\u003c/version\u003e\n\u003c/dependency\u003e\n```\n\n## Gradle\n\n```groovy\ncompile 'ru.burov4j.storm:storm-rabbitmq:1.0.1'\n```\n\n## RabbitMQ Connection\n\nYou can set RabbitMQ connection properties using RabbitMqConfigBuilder:\n\n```java\nRabbitMqConfig rabbitMqConfig = new RabbitMqConfigBuilder()\n                .setAddresses(\"localhost:5672\")\n                .setUsername(\"guest\")\n                .setPassword(\"guest\")\n                .setRequestedHeartbeat(60)\n                .setVirtualHost(\"/\")\n                .build();\n\nTopologyBuilder builder = new TopologyBuilder();\nbuilder.setSpout(\"rabbitmq-spout\", new RabbitMqSpout(rabbitMqConfig, scheme))\n       .addConfiguration(RabbitMqSpout.KEY_QUEUE_NAME, \"myQueue\");\n```\n\nThe same with Storm's API:\n\n```java\nTopologyBuilder builder = new TopologyBuilder();\nbuilder.setSpout(\"rabbitmq-spout\", new RabbitMqSpout(scheme))\n       .addConfiguration(RabbitMqSpout.KEY_QUEUE_NAME, \"myQueue\")\n       .addConfiguration(RabbitMqConfig.KEY_ADDRESSES, \"localhost:5672\")\n       .addConfiguration(RabbitMqConfig.KEY_USERNAME, \"guest\")\n       .addConfiguration(RabbitMqConfig.KEY_PASSWORD, \"guest\")\n       .addConfiguration(RabbitMqConfig.KEY_REQUESTED_HEARTBEAT, 60)\n       .addConfiguration(RabbitMqConfig.KEY_VIRTUAL_HOST, \"/\");\n```\n\nIt is not required to set all of properties: for example, you can set only RabbitMQ address.\nIn the case another properties will set as defaults:\n\n```java\nRabbitMqConfig rabbitMqConfig = new RabbitMqConfigBuilder()\n                .setAddresses(\"localhost:5672\")\n                .build();\n\nTopologyBuilder builder = new TopologyBuilder();\nbuilder.setSpout(\"rabbitmq-spout\", new RabbitMqSpout(rabbitMqConfig, scheme))\n       .addConfiguration(RabbitMqSpout.KEY_QUEUE_NAME, \"myQueue\");\n```\n\n## RabbitMQ Spout\n\nRabbitMqSpout deserializes input messages and then sends it in your Storm's topology.\nFor using the class you should implement RabbitMqMessageScheme interface:\n\n```java\nclass MyRabbitMqMessageScheme implements RabbitMqMessageScheme {\n\n    @Override\n    public void prepare(Map config, TopologyContext context) {\n        // your implementation here\n    }\n\n    @Override\n    public StreamedTuple convertToStreamedTuple(Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws ConvertionException {\n        // your implementation here\n    }\n\n    @Override\n    public Map\u003cString, Fields\u003e getStreamsOutputFields() {\n        // your implementation here\n    }\n\n    @Override\n    public void cleanup() {\n        // your implementation here\n    }\n}\n```\n\nIf you want to use only one output stream you can extends SingleStreamRabbitMqMessageScheme:\n\n```java\nclass MyRabbitMqMessageScheme extends SingleStreamRabbitMqMessageScheme {\n\n    @Override\n    public void prepare(Map config, TopologyContext context) {\n        // your implementation here\n    }\n                \n    @Override\n    public List\u003cObject\u003e convertToTuple(Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws ConvertionException {\n        // your implementation here\n    }\n    \n    @Override\n    public Fields getOutputFields() {\n        // your implementation here\n    }\n    \n    @Override\n    public void cleanup() {\n        // your implementation here\n    }\n}\n```\n\nThe next step is to pass your custom scheme to RabbitMqSpout:\n\n```java\nMyRabbitMqMessageScheme scheme = new MyRabbitMqMessageScheme();\nRabbitMqSpout rabbitMqSpout = new RabbitMqSpout(scheme);\n```\n\nYou can also set some properties for RabbitMqSpout:\n\n```java\nbuilder.setSpout(\"rabbitmq-spout\", rabbitMqSpout)\n       .addConfiguration(RabbitMqSpout.KEY_QUEUE_NAME, \"myQueue\") // required\n       .addConfiguration(RabbitMqSpout.KEY_AUTO_ACK, false)\n       .addConfiguration(RabbitMqSpout.KEY_PREFETCH_COUNT, 64)\n       .addConfiguration(RabbitMqSpout.KEY_REQUEUE_ON_FAIL, false);\n```\n\nNote that the property RabbitMqSpout.KEY_QUEUE_NAME is required.\n\nTo do some preparation logic you can implement RabbitMqInitializer interface:\n\n```java\nclass MyRabbitMqInitializer implements RabbitMqInitializer {\n    \n    @Override\n    public void initialize(Channel channel) throws IOException {\n        // your implementation here\n    }\n}\n```\n\nand then put it in your spout:\n\n```java\nRabbitMqInitializer myRabbitMqInitializer = new MyRabbitMqInitializer();\nrabbitMqSpout.setInitializer(myRabbitMqInitializer);\n```\n\n## RabbitMQ Bolt\n\nIf you want to send messages from your Storm's topology to RabbitMQ, you can use RabbitMqBolt.\nIn the case you should implement TupleToRabbitMqMessageConverter interface:\n\n```java\nclass MyTupleToRabbitMqMessageConverter implements TupleToRabbitMqMessageConverter {\n\n    @Override\n    public void prepare(Map config, TopologyContext context) {\n        // your implementation here\n    }\n\n    @Override\n    public String getExchange(Tuple tuple) throws ConvertionException {\n        // your implementation here\n    }\n\n    @Override\n    public String getRoutingKey(Tuple tuple) throws ConvertionException {\n        // your implementation here\n    }\n\n    @Override\n    public AMQP.BasicProperties getProperties(Tuple tuple) throws ConvertionException {\n        // your implementation here\n    }\n\n    @Override\n    public byte[] getMessageBody(Tuple tuple) throws ConvertionException {\n        // your implementation here\n    }\n\n    @Override\n    public void cleanup() {\n        // your implementation here\n    }\n}\n```\n\nThe next step is to pass your custom converter to RabbitMqBolt:\n\n```java\nMyTupleToRabbitMqMessageConverter converter = new MyTupleToRabbitMqMessageConverter();\nRabbitMqBolt rabbitMqBolt = new RabbitMqBolt(converter);\n```\n\nYou can also set some properties for RabbitMqBolt:\n\n```java\nbuilder.setBolt(\"rabbitmq-bolt\", rabbitMqBolt)\n       .addConfiguration(RabbitMqBolt.KEY_MANDATORY, false)\n       .addConfiguration(RabbitMqBolt.KEY_IMMEDIATE, false);\n```\n\nYou can read more information about RabbitMQ properties here: https://www.rabbitmq.com/amqp-0-9-1-reference.html\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fburov4j%2Fstorm-rabbitmq","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fburov4j%2Fstorm-rabbitmq","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fburov4j%2Fstorm-rabbitmq/lists"}