examples/storm-starter/multilang/resources/asyncSplitsentence.js

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Example for async bolt. Receives sentence and breaks it into words.
 *
 */


var storm = require('./storm');
var BasicBolt = storm.BasicBolt;

function SplitSentenceBolt() {
    BasicBolt.call(this);
};

SplitSentenceBolt.prototype = Object.create(BasicBolt.prototype);
SplitSentenceBolt.prototype.constructor = SplitSentenceBolt;

SplitSentenceBolt.prototype.process = function(tup, done) {
    var self = this;

    // Here setTimeout is not really needed, we use it to demonstrate asynchronous code in the process method:
    setTimeout(function() {
        var words = tup.values[0].split(" ");
        words.forEach(function(word) {
            self.emit({tuple: [word], anchorTupleId: tup.id}, function(taskIds) {
                self.log(word + ' sent to task ids - ' + taskIds);
            });
        });
        done();
    }, 5000)
}

new SplitSentenceBolt().run();