storm-client/src/jvm/org/apache/storm/streams/ProcessorNode.java

/**
 * 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.storm.streams;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.apache.storm.streams.processors.BatchProcessor;
import org.apache.storm.streams.processors.Processor;
import org.apache.storm.streams.processors.ProcessorContext;
import org.apache.storm.tuple.Fields;

/**
 * Node that wraps a processor in the stream.
 */
public class ProcessorNode extends Node {
    private final Processor<?> processor;
    private final boolean isBatch;
    private final boolean preservesKey;
    // Windowed parent streams
    private Set<String> windowedParentStreams = Collections.emptySet();

    public ProcessorNode(Processor<?> processor, String outputStream, Fields outputFields, boolean preservesKey) {
        super(outputStream, outputFields);
        this.isBatch = processor instanceof BatchProcessor;
        this.processor = processor;
        this.preservesKey = preservesKey;
    }

    public ProcessorNode(Processor<?> processor, String outputStream, Fields outputFields) {
        this(processor, outputStream, outputFields, false);
    }

    public Processor<?> getProcessor() {
        return processor;
    }

    public boolean isBatch() {
        return isBatch;
    }

    public Set<String> getWindowedParentStreams() {
        return Collections.unmodifiableSet(windowedParentStreams);
    }

    void setWindowedParentStreams(Set<String> windowedParentStreams) {
        this.windowedParentStreams = new HashSet<>(windowedParentStreams);
    }

    void initProcessorContext(ProcessorContext context) {
        processor.init(context);
    }

    public boolean isPreservesKey() {
        return preservesKey;
    }

    @Override
    public String toString() {
        return "ProcessorNode{"
                + "processor=" + processor
                + ", isBatch=" + isBatch
                + ", preservesKey=" + preservesKey
                + ", windowedParentStreams=" + windowedParentStreams
                + "} "
                + super.toString();
    }
}