alluxio.worker.block.io.MockBlockReader.java Source code

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Here is the source code for alluxio.worker.block.io.MockBlockReader.java

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.worker.block.io;

import io.netty.buffer.ByteBuf;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;

/**
 * A simple {@link BlockReader} to use for testing purposes.
 */
public final class MockBlockReader implements BlockReader {
    private final byte[] mBytes;

    /**
     * Constructs a mock block reader which will read the given data.
     *
     * @param bytes the bytes to read from
     */
    public MockBlockReader(byte[] bytes) {
        mBytes = bytes;
    }

    @Override
    public void close() throws IOException {
        // no-op
    }

    @Override
    public ByteBuffer read(long offset, long length) throws IOException {
        return ByteBuffer.wrap(mBytes, (int) offset, (int) length);
    }

    @Override
    public int transferTo(ByteBuf buf) throws IOException {
        int remaining = buf.readableBytes();
        return buf.writeBytes(mBytes).readableBytes() - remaining;
    }

    public boolean isClosed() {
        return false;
    }

    @Override
    public long getLength() {
        return mBytes.length;
    }

    @Override
    public ReadableByteChannel getChannel() {
        return Channels.newChannel(new ByteArrayInputStream(mBytes));
    }
}