| /* |
| * 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.algebricks.runtime.operators.std; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputOneFramePushRuntime; |
| import edu.uci.ics.hyracks.algebricks.runtime.operators.base.AbstractOneInputOneOutputRuntimeFactory; |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| |
| public class StreamProjectRuntimeFactory extends AbstractOneInputOneOutputRuntimeFactory { |
| |
| private static final long serialVersionUID = 1L; |
| private final boolean flushFramesRapidly; |
| |
| public StreamProjectRuntimeFactory(int[] projectionList, boolean flushFramesRapidly) { |
| super(projectionList); |
| this.flushFramesRapidly = flushFramesRapidly; |
| } |
| |
| public StreamProjectRuntimeFactory(int[] projectionList) { |
| super(projectionList); |
| this.flushFramesRapidly = false; |
| } |
| |
| @Override |
| public String toString() { |
| return "stream-project " + Arrays.toString(projectionList); |
| } |
| |
| @Override |
| public AbstractOneInputOneOutputOneFramePushRuntime createOneOutputPushRuntime(final IHyracksTaskContext ctx) |
| throws AlgebricksException { |
| |
| return new AbstractOneInputOneOutputOneFramePushRuntime() { |
| |
| private boolean first = true; |
| |
| @Override |
| public void open() throws HyracksDataException { |
| if (first) { |
| first = false; |
| initAccessAppend(ctx); |
| } |
| writer.open(); |
| } |
| |
| @Override |
| public void nextFrame(ByteBuffer buffer) throws HyracksDataException { |
| tAccess.reset(buffer); |
| int nTuple = tAccess.getTupleCount(); |
| |
| int t = 0; |
| for (; t < nTuple - 1; t++) { |
| appendProjectionToFrame(t, projectionList); |
| } |
| if (flushFramesRapidly) { |
| // Whenever all the tuples in the incoming frame have been consumed, the project operator |
| // will push its frame to the next operator; i.e., it won't wait until the frame gets full. |
| appendProjectionToFrame(t, projectionList, true); |
| } else { |
| appendProjectionToFrame(t, projectionList); |
| } |
| |
| } |
| |
| }; |
| } |
| |
| } |