org.apache.crunch.impl.mr.run.RTNode.java Source code

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Here is the source code for org.apache.crunch.impl.mr.run.RTNode.java

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/**
 * 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.
 */
package org.apache.crunch.impl.mr.run;

import java.io.Serializable;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.crunch.CrunchRuntimeException;
import org.apache.crunch.DoFn;
import org.apache.crunch.Emitter;
import org.apache.crunch.impl.mr.emit.IntermediateEmitter;
import org.apache.crunch.impl.mr.emit.MultipleOutputEmitter;
import org.apache.crunch.impl.mr.emit.OutputEmitter;
import org.apache.crunch.types.Converter;
import org.apache.crunch.types.PType;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.TaskInputOutputContext;

public class RTNode implements Serializable {

    private static final Log LOG = LogFactory.getLog(RTNode.class);

    private final String nodeName;
    private DoFn<Object, Object> fn;
    private PType<Object> outputPType;
    private final List<RTNode> children;
    private final Converter inputConverter;
    private final Converter outputConverter;
    private final String outputName;

    private transient Emitter<Object> emitter;

    public RTNode(DoFn<Object, Object> fn, PType<Object> outputPType, String name, List<RTNode> children,
            Converter inputConverter, Converter outputConverter, String outputName) {
        this.fn = fn;
        this.outputPType = outputPType;
        this.nodeName = name;
        this.children = children;
        this.inputConverter = inputConverter;
        this.outputConverter = outputConverter;
        this.outputName = outputName;
    }

    public void initialize(CrunchTaskContext ctxt) {
        if (emitter != null) {
            // Already initialized
            return;
        }
        fn.setContext(ctxt.getContext());
        fn.initialize();
        for (RTNode child : children) {
            child.initialize(ctxt);
        }

        if (outputConverter != null) {
            if (outputName != null) {
                this.emitter = new MultipleOutputEmitter(outputConverter, ctxt.getMultipleOutputs(), outputName);
            } else {
                this.emitter = new OutputEmitter(outputConverter, ctxt.getContext());
            }
        } else if (!children.isEmpty()) {
            Configuration conf = ctxt.getContext().getConfiguration();
            boolean disableDeepCopy = conf.getBoolean(RuntimeParameters.DISABLE_DEEP_COPY, false);
            this.emitter = new IntermediateEmitter(outputPType, children, conf,
                    disableDeepCopy || fn.disableDeepCopy());
        } else {
            throw new CrunchRuntimeException("Invalid RTNode config: no emitter for: " + nodeName);
        }
    }

    public boolean isLeafNode() {
        return outputConverter != null && children.isEmpty();
    }

    public void process(Object input) {
        try {
            fn.process(input, emitter);
        } catch (CrunchRuntimeException e) {
            if (!e.wasLogged()) {
                LOG.info(String.format("Crunch exception in '%s' for input: %s", nodeName, input.toString()), e);
                e.markLogged();
            }
            throw e;
        }
    }

    public void process(Object key, Object value) {
        process(inputConverter.convertInput(key, value));
    }

    public void processIterable(Object key, Iterable values) {
        process(inputConverter.convertIterableInput(key, values));
    }

    public void cleanup() {
        fn.cleanup(emitter);
        emitter.flush();
        for (RTNode child : children) {
            child.cleanup();
        }
    }

    @Override
    public String toString() {
        return "RTNode [nodeName=" + nodeName + ", fn=" + fn + ", children=" + children + ", inputConverter="
                + inputConverter + ", outputConverter=" + outputConverter + ", outputName=" + outputName + "]";
    }
}