Examples with StreamState org.apache.storm.streams.StreamState used on opensource projects

Example 1 with StreamState

use of org.apache.storm.streams.StreamState in project storm by apache.

the class StateQueryExample method main.

public static void main(String[] args) throws Exception {
    StreamBuilder builder = new StreamBuilder();
    StreamState<String, Long> ss = builder.newStream(new TestWordSpout(), new ValueMapper<String>(0), 2).mapToPair(w -> Pair.of(w, 1)).updateStateByKey(0L, (count, val) -> count + 1);
    /*
         * A stream of words emitted by the QuerySpout is used as
         * the keys to query the state.
         */
    builder.newStream(new QuerySpout(), new ValueMapper<String>(0)).stateQuery(ss).print();
    Config config = new Config();
    // use redis based state store for persistence
    config.put(Config.TOPOLOGY_STATE_PROVIDER, "org.apache.storm.redis.state.RedisKeyValueStateProvider");
    if (args.length > 0) {
        config.setNumWorkers(1);
        StormSubmitter.submitTopologyWithProgressBar(args[0], config, builder.build());
    } else {
        try (LocalCluster cluster = new LocalCluster();
            LocalCluster.LocalTopology topo = cluster.submitTopology("test", config, builder.build())) {
            Utils.sleep(60_000);
        }
    }
}