hyracks-core/src/main/java/edu/uci/ics/hyracks/runtime/OperatorRunnable.java

/*
 * Copyright 2009-2010 by The Regents of the University of California
 * 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 from
 * 
 *     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 edu.uci.ics.hyracks.runtime;

import java.nio.ByteBuffer;

import edu.uci.ics.hyracks.api.comm.IFrameReader;
import edu.uci.ics.hyracks.api.comm.IFrameWriter;
import edu.uci.ics.hyracks.api.dataflow.IOperatorNodePushable;
import edu.uci.ics.hyracks.context.HyracksContext;

public class OperatorRunnable implements Runnable {
    private IOperatorNodePushable opNode;
    private IFrameReader reader;
    private ByteBuffer buffer;

    public OperatorRunnable(HyracksContext ctx, IOperatorNodePushable opNode) {
        this.opNode = opNode;
        buffer = ctx.getResourceManager().allocateFrame();
    }

    public void setFrameWriter(int index, IFrameWriter writer) {
        opNode.setFrameWriter(index, writer);
    }

    public void setFrameReader(IFrameReader reader) {
        this.reader = reader;
    }

    @Override
    public void run() {
        try {
            opNode.open();
            if (reader != null) {
                reader.open();
                while (reader.nextFrame(buffer)) {
                    buffer.flip();
                    opNode.nextFrame(buffer);
                    buffer.compact();
                }
                reader.close();
            }
            opNode.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}