netty中EmbeddedChannel如何使用
这篇文章给大家介绍netty中EmbeddedChannel如何使用,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
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一种特殊的Channel实现----EmbeddedChannel,它是Netty专门为改进针对ChannelHandler的单元测试而提供的。
名称 | 职责 |
---|---|
writeInbound | 将入站消息写到EmbeddedChannel中。如果可以通过readInbound方法从EmbeddedChannel中读取数据,则返回true |
readInbound | 从EmbeddedChannel中读取入站消息。任何返回东西都经过整个ChannelPipeline。如果没有任何可供读取的,则返回null |
writeOutbound | 将出站消息写到EmbeddedChannel中,如果现在可以通过readOutbound从EmbeddedChannel中读取到东西,则返回true |
readOutbound | 从EmbeddedChannel中读取出站消息。任何返回东西都经过整个ChannelPipeline。如果没有任何可供读取的,则返回null |
finish | 将EmbeddedChannel标记为完成,如果有可读取的入站或出站数据,则返回true。这个方法还将会调用EmbeddedChannel上的close方法 |
测试入站消息
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
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(); } }
测试出站消息
public class AbsIntegerEncoder extends MessageToMessageEncoder{ @Override protected void encode(ChannelHandlerContext channelHandlerContext, ByteBuf in, List
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()); } }
测试异常处理
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
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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