org.apache.drill.exec.cache.CachedVectorContainer.java Source code

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Here is the source code for org.apache.drill.exec.cache.CachedVectorContainer.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.drill.exec.cache;

import java.io.ByteArrayInputStream;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.drill.exec.memory.BufferAllocator;
import org.apache.drill.exec.record.VectorAccessible;
import org.apache.drill.exec.record.VectorContainer;
import org.apache.drill.exec.record.WritableBatch;

public class CachedVectorContainer extends LoopedAbstractDrillSerializable {
    static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(CachedVectorContainer.class);

    private byte[] data;
    private final BufferAllocator allocator;
    private VectorContainer container;

    public CachedVectorContainer(WritableBatch batch, BufferAllocator allocator) throws IOException {
        VectorAccessibleSerializable va = new VectorAccessibleSerializable(batch, allocator);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        va.writeToStream(baos);
        this.allocator = allocator;
        this.data = baos.toByteArray();
        va.clear();
    }

    public CachedVectorContainer(BufferAllocator allocator) {
        this.allocator = allocator;
    }

    public CachedVectorContainer(byte[] data, BufferAllocator allocator) {
        this.data = data;
        this.allocator = allocator;
    }

    private void construct() {
        try {
            VectorAccessibleSerializable va = new VectorAccessibleSerializable(allocator);
            va.readFromStream(new ByteArrayInputStream(data));
            this.container = va.get();
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }

    }

    @Override
    public void read(DataInput input) throws IOException {
        int len = input.readInt();
        this.data = new byte[len];
        input.readFully(data);
    }

    @Override
    public void write(DataOutput output) throws IOException {
        output.writeInt(data.length);
        output.write(data);
    }

    public VectorAccessible get() {
        if (container == null) {
            construct();
        }
        return container;
    }

    public void clear() {
        if (container != null) {
            container.clear();
        }
        container = null;
    }

    public byte[] getData() {
        return data;
    }

}