hyracks-storage-am-common/src/main/java/edu/uci/ics/hyracks/storage/am/common/dataflow/TreeIndexInsertUpdateDeleteOperatorNodePushable.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.storage.am.common.dataflow;

import java.nio.ByteBuffer;

import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
import edu.uci.ics.hyracks.api.dataflow.value.IRecordDescriptorProvider;
import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor;
import edu.uci.ics.hyracks.dataflow.common.comm.util.FrameUtils;
import edu.uci.ics.hyracks.dataflow.std.base.AbstractUnaryInputUnaryOutputOperatorNodePushable;
import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndex;
import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrame;
import edu.uci.ics.hyracks.storage.am.common.ophelpers.IndexOp;
import edu.uci.ics.hyracks.storage.am.common.ophelpers.IndexOpContext;

public class TreeIndexInsertUpdateDeleteOperatorNodePushable extends
		AbstractUnaryInputUnaryOutputOperatorNodePushable {
	private final TreeIndexOpHelper treeIndexOpHelper;
	private FrameTupleAccessor accessor;
	private final IRecordDescriptorProvider recordDescProvider;
	private final IndexOp op;
	private final PermutingFrameTupleReference tuple = new PermutingFrameTupleReference();
	private ByteBuffer writeBuffer;
	private IndexOpContext opCtx;

	public TreeIndexInsertUpdateDeleteOperatorNodePushable(
			AbstractTreeIndexOperatorDescriptor opDesc,
			IHyracksTaskContext ctx, int partition, int[] fieldPermutation,
			IRecordDescriptorProvider recordDescProvider, IndexOp op) {
		treeIndexOpHelper = opDesc.getTreeIndexOpHelperFactory()
				.createTreeIndexOpHelper(opDesc, ctx, partition,
						IndexHelperOpenMode.OPEN);
		this.recordDescProvider = recordDescProvider;
		this.op = op;
		tuple.setFieldPermutation(fieldPermutation);
	}

	@Override
	public void open() throws HyracksDataException {
		AbstractTreeIndexOperatorDescriptor opDesc = (AbstractTreeIndexOperatorDescriptor) treeIndexOpHelper
				.getOperatorDescriptor();
		RecordDescriptor inputRecDesc = recordDescProvider
				.getInputRecordDescriptor(opDesc.getOperatorId(), 0);
		accessor = new FrameTupleAccessor(treeIndexOpHelper
				.getHyracksTaskContext().getFrameSize(), inputRecDesc);
		writeBuffer = treeIndexOpHelper.getHyracksTaskContext().allocateFrame();
		writer.open();
		try {
			treeIndexOpHelper.init();
			treeIndexOpHelper.getTreeIndex().open(
					treeIndexOpHelper.getIndexFileId());
			opCtx = treeIndexOpHelper.getTreeIndex().createOpContext(op,
					treeIndexOpHelper.getLeafFrame(),
					treeIndexOpHelper.getInteriorFrame(),
					new LIFOMetaDataFrame());
		} catch (Exception e) {
			// cleanup in case of failure
			treeIndexOpHelper.deinit();
			throw new HyracksDataException(e);
		}
	}

	@Override
	public void nextFrame(ByteBuffer buffer) throws HyracksDataException {
		final ITreeIndex treeIndex = treeIndexOpHelper.getTreeIndex();
		accessor.reset(buffer);

		int tupleCount = accessor.getTupleCount();
		for (int i = 0; i < tupleCount; i++) {
			tuple.reset(accessor, i);
			try {
				switch (op) {

				case INSERT: {
					treeIndex.insert(tuple, opCtx);
				}
					break;

				case DELETE: {
					treeIndex.delete(tuple, opCtx);
				}
					break;

				default: {
					throw new HyracksDataException("Unsupported operation "
							+ op + " in tree index InsertUpdateDelete operator");
				}

				}

			} catch (Exception e) {
				e.printStackTrace();
				throw new HyracksDataException(e);
			}
		}

		// pass a copy of the frame to next op
		System.arraycopy(buffer.array(), 0, writeBuffer.array(), 0,
				buffer.capacity());
		FrameUtils.flushFrame(writeBuffer, writer);
	}

	@Override
	public void close() throws HyracksDataException {
		try {
			writer.close();
		} finally {
			treeIndexOpHelper.deinit();
		}
	}

	@Override
	public void fail() throws HyracksDataException {
		writer.fail();
	}
}