org.apache.tajo.tuple.BaseTupleBuilder.java Source code

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Here is the source code for org.apache.tajo.tuple.BaseTupleBuilder.java

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/***
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

package org.apache.tajo.tuple;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.tajo.catalog.Schema;
import org.apache.tajo.catalog.SchemaUtil;
import org.apache.tajo.storage.Tuple;
import org.apache.tajo.tuple.offheap.HeapTuple;
import org.apache.tajo.tuple.offheap.OffHeapRowWriter;
import org.apache.tajo.tuple.offheap.ZeroCopyTuple;
import org.apache.tajo.unit.StorageUnit;
import org.apache.tajo.util.Deallocatable;
import org.apache.tajo.util.FileUtil;
import org.apache.tajo.util.UnsafeUtil;
import sun.misc.Unsafe;
import sun.nio.ch.DirectBuffer;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

public class BaseTupleBuilder extends OffHeapRowWriter implements TupleBuilder, Deallocatable {
    private static final Log LOG = LogFactory.getLog(BaseTupleBuilder.class);

    private static final Unsafe UNSAFE = UnsafeUtil.unsafe;

    // buffer
    private ByteBuffer buffer;
    private long address;

    public BaseTupleBuilder(Schema schema) {
        super(SchemaUtil.toDataTypes(schema));
        buffer = ByteBuffer.allocateDirect(64 * StorageUnit.KB).order(ByteOrder.nativeOrder());
        address = UnsafeUtil.getAddress(buffer);
    }

    @Override
    public long address() {
        return address;
    }

    public void ensureSize(int size) {
        if (buffer.remaining() - size < 0) { // check the remain size
            // enlarge new buffer and copy writing data
            int newBlockSize = UnsafeUtil.alignedSize(buffer.capacity() * 2);
            ByteBuffer newByteBuf = ByteBuffer.allocateDirect(newBlockSize);
            long newAddress = ((DirectBuffer) newByteBuf).address();
            UNSAFE.copyMemory(this.address, newAddress, buffer.limit());
            LOG.debug("Increase the buffer size to " + FileUtil.humanReadableByteCount(newBlockSize, false));

            // release existing buffer and replace variables
            UnsafeUtil.free(buffer);
            buffer = newByteBuf;
            address = newAddress;
        }
    }

    @Override
    public int position() {
        return 0;
    }

    @Override
    public void forward(int length) {
    }

    @Override
    public void endRow() {
        super.endRow();
        buffer.position(0).limit(offset());
    }

    @Override
    public Tuple build() {
        return buildToHeapTuple();
    }

    public HeapTuple buildToHeapTuple() {
        byte[] bytes = new byte[buffer.limit()];
        UNSAFE.copyMemory(null, address, bytes, UnsafeUtil.ARRAY_BOOLEAN_BASE_OFFSET, buffer.limit());
        return new HeapTuple(bytes, dataTypes());
    }

    public ZeroCopyTuple buildToZeroCopyTuple() {
        ZeroCopyTuple zcTuple = new ZeroCopyTuple();
        zcTuple.set(buffer, 0, buffer.limit(), dataTypes());
        return zcTuple;
    }

    public void release() {
        UnsafeUtil.free(buffer);
        buffer = null;
        address = 0;
    }
}