netty5/codec/src/test/java/io/netty/handler/codec/ByteToMessageDecoderTest.java

/*
 * Copyright 2013 The Netty Project
 *
 * The Netty Project 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 io.netty.handler.codec;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.embedded.EmbeddedChannel;
import org.junit.Assert;
import org.junit.Test;

import java.util.List;

public class ByteToMessageDecoderTest {

    @Test
    public void testRemoveItself() {
        EmbeddedChannel channel = new EmbeddedChannel(new ByteToMessageDecoder() {
            private boolean removed;

            @Override
            protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
                Assert.assertFalse(removed);
                in.readByte();
                ctx.pipeline().remove(this);
                removed = true;
            }
        });

        ByteBuf buf = Unpooled.wrappedBuffer(new byte[] {'a', 'b', 'c'});
        channel.writeInbound(buf.copy());
        ByteBuf b = (ByteBuf) channel.readInbound();
        Assert.assertEquals(b, buf.skipBytes(1));
        b.release();
        buf.release();
    }

    @Test
    public void testRemoveItselfWriteBuffer() {
        final ByteBuf buf = Unpooled.buffer().writeBytes(new byte[]{'a', 'b', 'c'});
        EmbeddedChannel channel = new EmbeddedChannel(new ByteToMessageDecoder() {
            private boolean removed;

            @Override
            protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
                Assert.assertFalse(removed);
                in.readByte();
                ctx.pipeline().remove(this);

                // This should not let it keep call decode
                buf.writeByte('d');
                removed = true;
            }
        });

        channel.writeInbound(buf.copy());
        ByteBuf b = (ByteBuf) channel.readInbound();
        Assert.assertEquals(b, Unpooled.wrappedBuffer(new byte[] { 'b', 'c'}));
        buf.release();
        b.release();
    }
}