這篇文章給大家介紹netty中EmbeddedChannel如何使用,內(nèi)容非常詳細(xì),感興趣的小伙伴們可以參考借鑒,希望對大家能有所幫助。
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一種特殊的Channel實現(xiàn)----EmbeddedChannel,它是Netty專門為改進(jìn)針對ChannelHandler的單元測試而提供的。
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。這個方法還將會調(diào)用EmbeddedChannel上的close方法 |
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(); } }
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()); } }
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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