org.neo4j.bolt.v1.transport.socket.Chunker.java Source code

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Here is the source code for org.neo4j.bolt.v1.transport.socket.Chunker.java

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/*
 * Copyright (c) 2002-2016 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.bolt.v1.transport.socket;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.UnpooledByteBufAllocator;
import io.netty.channel.Channel;
import io.netty.channel.ChannelPromise;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

import java.io.IOException;
import java.nio.ByteBuffer;

import org.neo4j.bolt.v1.transport.ChunkedOutput;

import static org.mockito.Matchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

/** Helper to chunk up serialized data for testing */
public class Chunker {
    public static byte[] chunk(int maxChunkSize, byte[][] messages) throws IOException {
        final ByteBuffer outputBuffer = ByteBuffer.allocate(1024 * 8);

        Channel ch = mock(Channel.class);
        when(ch.alloc()).thenReturn(UnpooledByteBufAllocator.DEFAULT);
        when(ch.writeAndFlush(any(), any(ChannelPromise.class))).then(new Answer<Object>() {
            @Override
            public Object answer(InvocationOnMock inv) throws Throwable {
                ByteBuf buf = (ByteBuf) inv.getArguments()[0];
                outputBuffer.limit(outputBuffer.position() + buf.readableBytes());
                buf.readBytes(outputBuffer);
                buf.release();
                return null;
            }
        });

        ChunkedOutput out = new ChunkedOutput(ch, maxChunkSize + 2 /* for chunk header */ );

        for (byte[] message : messages) {
            out.writeBytes(message, 0, message.length);
            out.onMessageComplete();
        }
        out.flush();
        out.close();

        byte[] bytes = new byte[outputBuffer.limit()];
        outputBuffer.position(0);
        outputBuffer.get(bytes);
        return bytes;
    }
}