edu.mit.streamjit.impl.concurrent.ConcurrentDrainer.java Source code

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Here is the source code for edu.mit.streamjit.impl.concurrent.ConcurrentDrainer.java

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/*
 * Copyright (c) 2013-2014 Massachusetts Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package edu.mit.streamjit.impl.concurrent;

import java.util.Map;
import java.util.Set;

import static com.google.common.base.Preconditions.*;
import com.google.common.collect.ImmutableMap;

import edu.mit.streamjit.impl.blob.Blob;
import edu.mit.streamjit.impl.blob.Blob.Token;
import edu.mit.streamjit.impl.common.AbstractDrainer;
import edu.mit.streamjit.impl.common.BlobThread;
import edu.mit.streamjit.impl.distributed.common.Utils;

/**
 * Drainer for {@link ConcurrentStreamCompiler}. Traverse through
 * {@link BlobNode}s of the {@link BlobGraph} and performs the draining.
 * 
 * @author Sumanan sumanan@mit.edu
 * @since Jul 30, 2013
 */
public final class ConcurrentDrainer extends AbstractDrainer {

    /**
     * Each blob in the stream graph and it's blobID.
     */
    ImmutableMap<Token, Blob> blobMap;

    /**
     * Set of threads that each blob is having.
     */
    ImmutableMap<Blob, Set<BlobThread>> threadMap;

    public ConcurrentDrainer(BlobGraph blobGraph, Map<Blob, Set<BlobThread>> threadMap) {
        setBlobGraph(blobGraph);
        blobMap = buildBlobMap(threadMap.keySet());
        this.threadMap = ImmutableMap.copyOf(threadMap);
    }

    @Override
    protected void drainingDone(boolean isFinal) {
        System.out.println("Draining Finished");
    }

    @Override
    protected void drain(Token blobID, boolean isFinal) {
        Blob blob = blobMap.get(blobID);
        checkNotNull(blob);

        Runnable callback = new DrainerCallBack(this, blobID);
        blob.drain(callback);
    }

    @Override
    protected void drainingDone(Token blobID, boolean isFinal) {
        Blob blob = blobMap.get(blobID);
        Set<BlobThread> blobThreads = threadMap.get(blob);
        checkNotNull(blobThreads);
        for (BlobThread thread : blobThreads)
            thread.requestStop();
    }

    private ImmutableMap<Token, Blob> buildBlobMap(Set<Blob> blobSet) {
        ImmutableMap.Builder<Token, Blob> builder = new ImmutableMap.Builder<>();
        for (Blob b : blobSet) {
            Token t = Utils.getBlobID(b);
            if (t == null)
                throw new AssertionError("Blob with no identifier");

            builder.put(t, b);
        }
        ImmutableMap<Token, Blob> blobMap = builder.build();

        if (!blobMap.keySet().equals(blobGraph.getBlobIds()))
            throw new AssertionError("Not all blob nodes have matching blobs");

        return blobMap;
    }

    private class DrainerCallBack implements Runnable {
        AbstractDrainer drainer;
        Token blobID;

        private DrainerCallBack(AbstractDrainer drainer, Token blobID) {
            this.drainer = drainer;
            this.blobID = blobID;
        }

        @Override
        public void run() {
            drainer.drained(blobID);
        }
    }

    @Override
    protected void prepareDraining(boolean isFinal) {
        // TODO Auto-generated method stub
    }
}