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netty使用EmbeddedChannel對channel

一種特殊的Channel實(shí)現(xiàn)----EmbeddedChannel，它是Netty專門為改進(jìn)針對ChannelHandler的單元測試而提供的。

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名稱職責(zé)
writeInbound 將入站消息寫到EmbeddedChannel中。如果可以通過readInbound方法從EmbeddedChannel中讀取數(shù)據(jù)，則返回true
readInbound 從EmbeddedChannel中讀取入站消息。任何返回東西都經(jīng)過整個(gè)ChannelPipeline。如果沒有任何可供讀取的，則返回null
writeOutbound 將出站消息寫到EmbeddedChannel中，如果現(xiàn)在可以通過readOutbound從EmbeddedChannel中讀取到東西，則返回true
readOutbound 從EmbeddedChannel中讀取出站消息。任何返回東西都經(jīng)過整個(gè)ChannelPipeline。如果沒有任何可供讀取的，則返回null
finish 將EmbeddedChannel標(biāo)記為完成，如果有可讀取的入站或出站數(shù)據(jù)，則返回true。這個(gè)方法還將會調(diào)用EmbeddedChannel上的close方法

測試入站消息

public class FixedLengthFrameDecoder extends ByteToMessageDecoder {
    private final int frameLength;

    public FixedLengthFrameDecoder(int frameLength) {
        if (frameLength <= 0) {
            throw new IllegalArgumentException("frameLength must be positive integer: " + frameLength);
        }
        this.frameLength = frameLength;
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List out) throws Exception {
        while (in.readableBytes() >= frameLength) {
            ByteBuf buf = in.readBytes(frameLength);
            out.add(buf);
        }
    }
}

public class FixedLengthFrameDecoderTest {
    @Test
    public void testFramesDecoded() {
        ByteBuf buf = Unpooled.buffer();
        for (int i = 0; i < 9; i++) {
            buf.writeByte(i);
        }
        ByteBuf input = buf.duplicate();
        EmbeddedChannel channel = new EmbeddedChannel(new FixedLengthFrameDecoder(3));
        Assert.assertTrue(channel.writeInbound(input.retain()));
        Assert.assertTrue(channel.finish());

        ByteBuf read = channel.readInbound();
        Assert.assertEquals(buf.readSlice(3), read);
        read.release();

        read = channel.readInbound();
        Assert.assertEquals(buf.readSlice(3), read);
        read.release();

        read = channel.readInbound();
        Assert.assertEquals(buf.readSlice(3), read);
        read.release();

        Assert.assertNull(channel.readInbound());
        buf.release();
    }

    @Test
    public void testFramesDecoded2() {
        ByteBuf buf = Unpooled.buffer();
        for (int i = 0; i < 9; i++) {
            buf.writeByte(i);
        }
        ByteBuf input = buf.duplicate();
        EmbeddedChannel channel = new EmbeddedChannel(new FixedLengthFrameDecoder(3));
        Assert.assertFalse(channel.writeInbound(input.readBytes(2)));
        Assert.assertTrue(channel.writeInbound(input.readBytes(7)));
        Assert.assertTrue(channel.finish());
        ByteBuf read = channel.readInbound();
        Assert.assertEquals(buf.readSlice(3), read);
        read.release();

        read = channel.readInbound();
        Assert.assertEquals(buf.readSlice(3), read);
        read.release();

        read = channel.readInbound();
        Assert.assertEquals(buf.readSlice(3), read);
        read.release();

        Assert.assertNull(channel.readInbound());
        buf.release();
    }
}


測試出站消息
public class AbsIntegerEncoder extends MessageToMessageEncoder {
    @Override
    protected void encode(ChannelHandlerContext channelHandlerContext, ByteBuf in, List out) throws Exception {
        while (in.readableBytes() >= 4) {
            int value = Math.abs(in.readInt());
            out.add(value);
        }
    }
}

public class AbsIntegerEncoderTest {
    @Test
    public void testEncoded() {
        ByteBuf buf = Unpooled.buffer();
        for (int i = 0; i < 10; i++) {
            buf.writeInt(i * -1);
        }
        EmbeddedChannel channel = new EmbeddedChannel(new AbsIntegerEncoder());
        Assert.assertTrue(channel.writeOutbound(buf));
        Assert.assertTrue(channel.finish());

        for (int i = 0; i < 10; i++) {
            Assert.assertEquals(Integer.valueOf(i), channel.readOutbound());
        }
        Assert.assertNull(channel.readOutbound());
    }
}


測試異常處理
public class FrameChunkDecoder extends ByteToMessageDecoder {
    private final int maxFrameSize;

    public FrameChunkDecoder(int maxFrameSize) {
        this.maxFrameSize = maxFrameSize;
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List out) throws Exception {
        int readableBytes = in.readableBytes();
        if (readableBytes > maxFrameSize) {
            in.clear();
            throw new TooLongFrameException();
        }
        ByteBuf buf = in.readBytes(readableBytes);
        out.add(buf);
    }
}

public class FrameChunkDecoderTest {
    @Test
    public void testFramesDecoded() {
        ByteBuf buf = Unpooled.buffer();
        for (int i = 0; i < 9; i++) {
            buf.writeByte(i);
        }
        ByteBuf input = buf.duplicate();
        EmbeddedChannel channel = new EmbeddedChannel(new FrameChunkDecoder(3));
        Assert.assertTrue(channel.writeInbound(input.readBytes(2)));
        try {
            channel.writeInbound(input.readBytes(4));
            Assert.fail();
        } catch (TooLongFrameException e) {

        }
        Assert.assertTrue(channel.writeInbound(input.readBytes(3)));
        Assert.assertTrue(channel.finish());

        ByteBuf read = channel.readInbound();
        Assert.assertEquals(buf.readSlice(2), read);
        read.release();

        read = channel.readInbound();
        Assert.assertEquals(buf.skipBytes(4).readSlice(3), read);
        read.release();
        buf.release();
    }
}
            
            
                        

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