113 lines
4.6 KiB
Java
113 lines
4.6 KiB
Java
package redstorm.storm.jruby;
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import backtype.storm.spout.SpoutOutputCollector;
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import backtype.storm.task.TopologyContext;
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import backtype.storm.topology.base.BaseTransactionalSpout;
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import backtype.storm.topology.OutputFieldsDeclarer;
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import backtype.storm.transactional.ITransactionalSpout;
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import backtype.storm.tuple.Tuple;
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import backtype.storm.tuple.Fields;
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import java.util.Map;
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import org.jruby.Ruby;
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import org.jruby.RubyObject;
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import org.jruby.runtime.Helpers;
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import org.jruby.runtime.builtin.IRubyObject;
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import org.jruby.javasupport.JavaUtil;
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import org.jruby.RubyModule;
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import org.jruby.exceptions.RaiseException;
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/**
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* the JRubySpout class is a simple proxy class to the actual spout implementation in JRuby.
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* this proxy is required to bypass the serialization/deserialization process when dispatching
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* the spout to the workers. JRuby does not yet support serialization from Java
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* (Java serialization call on a JRuby class).
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*
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* Note that the JRuby spout proxy class is instanciated in the open method which is called after
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* deserialization at the worker and in both the declareOutputFields and isDistributed methods which
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* are called once before serialization at topology creation.
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*/
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public class JRubyTransactionalSpout extends BaseTransactionalSpout {
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private final String _realSpoutClassName;
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private final String[] _fields;
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private final String _bootstrap;
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// transient to avoid serialization
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protected transient IRubyObject _ruby_spout;
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protected transient Ruby __ruby__;
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/**
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* create a new JRubySpout
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*
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* @param baseClassPath the topology/project base JRuby class file path
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* @param realSpoutClassName the fully qualified JRuby spout implementation class name
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* @param fields the output fields names
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*/
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public JRubyTransactionalSpout(String baseClassPath, String realSpoutClassName, String[] fields) {
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_realSpoutClassName = realSpoutClassName;
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_fields = fields;
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_bootstrap = "require '" + baseClassPath + "'";
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}
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@Override
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public ITransactionalSpout.Coordinator getCoordinator(Map conf, TopologyContext context) {
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if (_ruby_spout == null) {
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IRubyObject _ruby_spout = initialize_ruby_spout();
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}
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IRubyObject ruby_conf = JavaUtil.convertJavaToRuby(__ruby__, conf);
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IRubyObject ruby_context = JavaUtil.convertJavaToRuby(__ruby__, context);
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IRubyObject ruby_result = Helpers.invoke(__ruby__.getCurrentContext(), _ruby_spout, "get_coordinator", ruby_conf, ruby_context);
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return (ITransactionalSpout.Coordinator)ruby_result.toJava(ITransactionalSpout.Coordinator.class);
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}
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@Override
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public ITransactionalSpout.Emitter getEmitter(Map conf, TopologyContext context) {
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if (_ruby_spout == null) {
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IRubyObject _ruby_spout = initialize_ruby_spout();
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}
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IRubyObject ruby_conf = JavaUtil.convertJavaToRuby(__ruby__, conf);
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IRubyObject ruby_context = JavaUtil.convertJavaToRuby(__ruby__, context);
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IRubyObject ruby_result = Helpers.invoke(__ruby__.getCurrentContext(), _ruby_spout, "get_emitter", ruby_conf, ruby_context);
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return (ITransactionalSpout.Emitter)ruby_result.toJava(ITransactionalSpout.Emitter.class);
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}
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@Override
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public void declareOutputFields(OutputFieldsDeclarer declarer) {
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// declareOutputFields is executed in the topology creation time, before serialisation.
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// just create tmp spout instance to call declareOutputFields.
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if (_fields.length > 0) {
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declarer.declare(new Fields(_fields));
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} else {
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IRubyObject ruby_spout = initialize_ruby_spout();
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IRubyObject ruby_declarer = JavaUtil.convertJavaToRuby(__ruby__, declarer);
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Helpers.invoke(__ruby__.getCurrentContext(), ruby_spout, "declare_output_fields", ruby_declarer);
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}
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}
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@Override
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public Map<String, Object> getComponentConfiguration() {
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// getComponentConfiguration is executed in the topology creation time, before serialisation.
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// just create tmp spout instance to call getComponentConfiguration.
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IRubyObject ruby_spout = initialize_ruby_spout();
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IRubyObject ruby_result = Helpers.invoke(__ruby__.getCurrentContext(), ruby_spout, "get_component_configuration");
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return (Map)ruby_result.toJava(Map.class);
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}
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protected IRubyObject initialize_ruby_spout() {
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__ruby__ = Ruby.getGlobalRuntime();
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RubyModule ruby_class;
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try {
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ruby_class = __ruby__.getClassFromPath(_realSpoutClassName);
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}
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catch (RaiseException e) {
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// after deserialization we need to recreate ruby environment
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__ruby__.evalScriptlet(_bootstrap);
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ruby_class = __ruby__.getClassFromPath(_realSpoutClassName);
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}
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return Helpers.invoke(__ruby__.getCurrentContext(), ruby_class, "new");
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}
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}
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