116 lines
4.4 KiB
Java
116 lines
4.4 KiB
Java
package redstorm.storm.jruby;
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import backtype.storm.task.OutputCollector;
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import backtype.storm.task.TopologyContext;
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import backtype.storm.topology.IRichBolt;
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import backtype.storm.topology.OutputFieldsDeclarer;
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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.Iterator;
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import java.util.Map;
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import org.jruby.Ruby;
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import org.jruby.RubyHash;
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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 JRubyBolt class is a proxy class to the actual bolt implementation in JRuby.
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* this proxy is required to bypass the serialization/deserialization issues of JRuby objects.
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* JRuby classes do not support Java serialization.
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*
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* Note that the JRuby bolt class is instanciated in the prepare method which is called after
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* deserialization at the worker and in the declareOutputFields & getComponentConfiguration
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* methods which are called once before serialization at topology creation.
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*/
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public class JRubyBolt implements IRichBolt {
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private final String _realBoltClassName;
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private final Map<String, String[]> _fields;
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private final String _bootstrap;
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// transient to avoid serialization
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private transient IRubyObject _ruby_bolt;
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private transient Ruby __ruby__;
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/**
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* create a new JRubyBolt
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*
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* @param baseClassPath the topology/project base JRuby class file path
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* @param realBoltClassName the fully qualified JRuby bolt implementation class name
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* @param fields the output fields names
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*/
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public JRubyBolt(String baseClassPath, String realBoltClassName, Map<String, String[]> fields) {
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_realBoltClassName = realBoltClassName;
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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 void prepare(final Map conf, final TopologyContext context, final OutputCollector collector) {
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_ruby_bolt = initialize_ruby_bolt();
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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_collector = JavaUtil.convertJavaToRuby(__ruby__, collector);
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Helpers.invoke(__ruby__.getCurrentContext(), _ruby_bolt, "prepare", ruby_conf, ruby_context, ruby_collector);
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}
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@Override
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public void execute(Tuple input) {
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IRubyObject ruby_input = JavaUtil.convertJavaToRuby(__ruby__, input);
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Helpers.invoke(__ruby__.getCurrentContext(), _ruby_bolt, "execute", ruby_input);
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}
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@Override
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public void cleanup() {
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Helpers.invoke(__ruby__.getCurrentContext(), _ruby_bolt, "cleanup");
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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 bolt instance to call declareOutputFields.
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if (_fields.size() > 0) {
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Iterator iterator = _fields.entrySet().iterator();
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while (iterator.hasNext()) {
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Map.Entry<String, String[]> field = (Map.Entry<String, String[]>)iterator.next();
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declarer.declareStream(field.getKey(), new Fields(field.getValue()));
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iterator.remove();
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}
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} else {
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IRubyObject ruby_bolt = initialize_ruby_bolt();
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IRubyObject ruby_declarer = JavaUtil.convertJavaToRuby(__ruby__, declarer);
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Helpers.invoke(__ruby__.getCurrentContext(), ruby_bolt, "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 bolt instance to call getComponentConfiguration.
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IRubyObject ruby_bolt = initialize_ruby_bolt();
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IRubyObject ruby_result = Helpers.invoke(__ruby__.getCurrentContext(), ruby_bolt, "get_component_configuration");
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return (Map)ruby_result.toJava(Map.class);
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}
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private IRubyObject initialize_ruby_bolt() {
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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(_realBoltClassName);
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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(_realBoltClassName);
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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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