StormComponentFactory.java

package com.yahoo.labs.samoa.topology.impl;

/*
 * #%L
 * SAMOA
 * %%
 * Copyright (C) 2013 Yahoo! Inc.
 * %%
 * Licensed 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.
 * #L%
 */

import java.util.HashMap;
import java.util.Map;

import com.yahoo.labs.samoa.core.EntranceProcessor;
import com.yahoo.labs.samoa.core.Processor;
import com.yahoo.labs.samoa.topology.ComponentFactory;
import com.yahoo.labs.samoa.topology.EntranceProcessingItem;
import com.yahoo.labs.samoa.topology.IProcessingItem;
import com.yahoo.labs.samoa.topology.ProcessingItem;
import com.yahoo.labs.samoa.topology.Stream;
import com.yahoo.labs.samoa.topology.Topology;

/**
 * Component factory implementation for samoa-storm
 */
public final class StormComponentFactory implements ComponentFactory {

    private final Map<String, Integer> processorList;

    public StormComponentFactory() {
        processorList = new HashMap<>();
    }

    @Override
    public ProcessingItem createPi(Processor processor) {
        return new StormProcessingItem(processor, this.getComponentName(processor.getClass()), 1);
    }

    @Override
    public EntranceProcessingItem createEntrancePi(EntranceProcessor processor) {
        return new StormEntranceProcessingItem(processor, this.getComponentName(processor.getClass()));
    }

    @Override
    public Stream createStream(IProcessingItem sourcePi) {
        StormTopologyNode stormCompatiblePi = (StormTopologyNode) sourcePi;
        return stormCompatiblePi.createStream();
    }

    @Override
    public Topology createTopology(String topoName) {
        return new StormTopology(topoName);
    }

    private String getComponentName(Class<? extends Processor> clazz) {
        StringBuilder componentName = new StringBuilder(clazz.getCanonicalName());
        String key = componentName.toString();
        Integer index;

        if (!processorList.containsKey(key)) {
            index = 1;
        } else {
            index = processorList.get(key) + 1;
        }

        processorList.put(key, index);

        componentName.append('_');
        componentName.append(index);

        return componentName.toString();
    }

    @Override
    public ProcessingItem createPi(Processor processor, int parallelism) {
        return new StormProcessingItem(processor, this.getComponentName(processor.getClass()), parallelism);
    }
}