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

創(chuàng)新互聯(lián)建站擁有網站維護技術和項目管理團隊，建立的售前、實施和售后服務體系，為客戶提供定制化的成都網站設計、成都網站制作、網站維護、成都移動云計算中心解決方案。為客戶網站安全和日常運維提供整體管家式外包優(yōu)質服務。我們的網站維護服務覆蓋集團企業(yè)、上市公司、外企網站、商城開發(fā)、政府網站等各類型客戶群體，為全球上千余家企業(yè)提供全方位網站維護、服務器維護解決方案。

名稱	職責
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。任何返回東西都經過整個ChannelPipeline。如果沒有任何可供讀取的，則返回null
finish	將EmbeddedChannel標記為完成，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<Object> 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<ByteBuf> {
    @Override
    protected void encode(ChannelHandlerContext channelHandlerContext, ByteBuf in, List<Object> 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<Object> 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();
    }
}

新聞名稱：netty使用EmbeddedChannel對channel
URL分享：http://chinadenli.net/article28/pipgcp.html

成都網站建設公司_創(chuàng)新互聯(lián)，為您提供網站內鏈、Google、網站收錄、網站建設、企業(yè)建站、關鍵詞優(yōu)化

廣告

聲明：本網站發(fā)布的內容（圖片、視頻和文字）以用戶投稿、用戶轉載內容為主，如果涉及侵權請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內容未經允許不得轉載，或轉載時需注明來源： 創(chuàng)新互聯(lián)