本文整理了Java中io.netty.buffer.ByteBuf.setIndex()方法的一些代码示例，展示了ByteBuf.setIndex()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。ByteBuf.setIndex()方法的具体详情如下：
包路径：io.netty.buffer.ByteBuf
类名称：ByteBuf
方法名：setIndex

ByteBuf.setIndex介绍

[英]Sets the readerIndex and writerIndex of this buffer in one shot. This method is useful when you have to worry about the invocation order of #readerIndex(int) and #writerIndex(int)methods. For example, the following code will fail:

// Create a buffer whose readerIndex, writerIndex and capacity are 
// 0, 0 and 8 respectively. 
ByteBuf buf =  
Unpooled.buffer(8); 
// IndexOutOfBoundsException is thrown because the specified 
// readerIndex (2) cannot be greater than the current writerIndex (0). 
buf.readerIndex(2); 
buf.writerIndex(4);

The following code will also fail:

// Create a buffer whose readerIndex, writerIndex and capacity are 
// 0, 8 and 8 respectively. 
ByteBuf buf =  
Unpooled.wrappedBuffer(new byte[8]); 
// readerIndex becomes 8. 
buf.readLong(); 
// IndexOutOfBoundsException is thrown because the specified 
// writerIndex (4) cannot be less than the current readerIndex (8). 
buf.writerIndex(4); 
buf.readerIndex(2);

By contrast, this method guarantees that it never throws an IndexOutOfBoundsException as long as the specified indexes meet basic constraints, regardless what the current index values of the buffer are:

// No matter what the current state of the buffer is, the following 
// call always succeeds as long as the capacity of the buffer is not 
// less than 4. 
buf.setIndex(2, 4);

[中]一次性设置此缓冲区的readerIndex和writerIndex。当您需要考虑#readerIndex（int）和#writeridex（int）方法的调用顺序时，此方法非常有用。例如，以下代码将失败：

// Create a buffer whose readerIndex, writerIndex and capacity are 
// 0, 0 and 8 respectively. 
ByteBuf buf =  
Unpooled.buffer(8); 
// IndexOutOfBoundsException is thrown because the specified 
// readerIndex (2) cannot be greater than the current writerIndex (0). 
buf.readerIndex(2); 
buf.writerIndex(4);

以下代码也将失败：

// Create a buffer whose readerIndex, writerIndex and capacity are 
// 0, 8 and 8 respectively. 
ByteBuf buf =  
Unpooled.wrappedBuffer(new byte[8]); 
// readerIndex becomes 8. 
buf.readLong(); 
// IndexOutOfBoundsException is thrown because the specified 
// writerIndex (4) cannot be less than the current readerIndex (8). 
buf.writerIndex(4); 
buf.readerIndex(2);

相比之下，此方法保证只要指定的索引满足基本约束，就不会引发IndexOutOfBoundsException，而不管缓冲区的当前索引值是什么：

// No matter what the current state of the buffer is, the following 
// call always succeeds as long as the capacity of the buffer is not 
// less than 4. 
buf.setIndex(2, 4);

代码示例

代码示例来源：origin: apache/incubator-dubbo

@Override
public void setIndex(int readerIndex, int writerIndex) {
  buffer.setIndex(readerIndex, writerIndex);
}

代码示例来源：origin: netty/netty

@Override
public ByteBuf setIndex(int readerIndex, int writerIndex) {
  buf.setIndex(readerIndex, writerIndex);
  return this;
}

代码示例来源：origin: netty/netty

@Override
public ByteBuf setIndex(int readerIndex, int writerIndex) {
  buf.setIndex(readerIndex, writerIndex);
  return this;
}

代码示例来源：origin: redisson/redisson

@Override
public ByteBuf setIndex(int readerIndex, int writerIndex) {
  buf.setIndex(readerIndex, writerIndex);
  return this;
}

代码示例来源：origin: redisson/redisson

@Override
public ByteBuf setIndex(int readerIndex, int writerIndex) {
  buf.setIndex(readerIndex, writerIndex);
  return this;
}

代码示例来源：origin: netty/netty

@Override
public ByteBuf duplicate() {
  return duplicate0().setIndex(readerIndex(), writerIndex());
}

代码示例来源：origin: netty/netty

ByteBuf duplicate() {
  return buf.duplicate().setIndex(idx(offset), idx(endOffset));
}

代码示例来源：origin: redisson/redisson

@Override
public ByteBuf duplicate() {
  return duplicate0().setIndex(readerIndex(), writerIndex());
}

代码示例来源：origin: redisson/redisson

ByteBuf duplicate() {
  return buf.duplicate().setIndex(idx(offset), idx(endOffset));
}

代码示例来源：origin: netty/netty

static ByteBuf copy(AbstractByteBuf buf, long addr, int index, int length) {
  buf.checkIndex(index, length);
  ByteBuf copy = buf.alloc().directBuffer(length, buf.maxCapacity());
  if (length != 0) {
    if (copy.hasMemoryAddress()) {
      PlatformDependent.copyMemory(addr, copy.memoryAddress(), length);
      copy.setIndex(0, length);
    } else {
      copy.writeBytes(buf, index, length);
    }
  }
  return copy;
}

代码示例来源：origin: netty/netty

@Override
public ByteBuf duplicate() {
  return duplicate0().setIndex(idx(readerIndex()), idx(writerIndex()));
}

代码示例来源：origin: netty/netty

@Override
public ByteBuf copy(int index, int length) {
  checkIndex(index, length);
  ByteBuf copy = alloc().directBuffer(length, maxCapacity());
  if (length != 0) {
    if (copy.hasMemoryAddress()) {
      PlatformDependent.copyMemory(addr(index), copy.memoryAddress(), length);
      copy.setIndex(0, length);
    } else {
      copy.writeBytes(this, index, length);
    }
  }
  return copy;
}

代码示例来源：origin: redisson/redisson

static ByteBuf copy(AbstractByteBuf buf, long addr, int index, int length) {
  buf.checkIndex(index, length);
  ByteBuf copy = buf.alloc().directBuffer(length, buf.maxCapacity());
  if (length != 0) {
    if (copy.hasMemoryAddress()) {
      PlatformDependent.copyMemory(addr, copy.memoryAddress(), length);
      copy.setIndex(0, length);
    } else {
      copy.writeBytes(buf, index, length);
    }
  }
  return copy;
}

代码示例来源：origin: netty/netty

@Override
public ByteBuf duplicate() {
  return unwrap().duplicate().setIndex(idx(readerIndex()), idx(writerIndex()));
}

代码示例来源：origin: redisson/redisson

@Override
public ByteBuf duplicate() {
  return duplicate0().setIndex(idx(readerIndex()), idx(writerIndex()));
}

代码示例来源：origin: redisson/redisson

@Override
public ByteBuf copy(int index, int length) {
  checkIndex(index, length);
  ByteBuf copy = alloc().directBuffer(length, maxCapacity());
  if (length != 0) {
    if (copy.hasMemoryAddress()) {
      PlatformDependent.copyMemory(addr(index), copy.memoryAddress(), length);
      copy.setIndex(0, length);
    } else {
      copy.writeBytes(this, index, length);
    }
  }
  return copy;
}

代码示例来源：origin: redisson/redisson

@Override
public ByteBuf duplicate() {
  return unwrap().duplicate().setIndex(idx(readerIndex()), idx(writerIndex()));
}

代码示例来源：origin: eclipse-vertx/vert.x

@Benchmark
 public void netty() {
  GET.setIndex(readerIndex, writeIndex);
  nettyChannel.writeInbound(GET);
  ByteBuf result = (ByteBuf) nettyChannel.outboundMessages().poll();
  consume(result);
 }
}

代码示例来源：origin: eclipse-vertx/vert.x

@Benchmark
public void vertx() {
 GET.setIndex(readerIndex, writeIndex);
 vertxChannel.writeInbound(GET);
 ByteBuf result = (ByteBuf) vertxChannel.outboundMessages().poll();
 consume(result);
}

代码示例来源：origin: eclipse-vertx/vert.x

@Fork(value = 1, jvmArgsAppend = {
  "-Dvertx.threadChecks=false",
  "-Dvertx.disableContextTimings=true",
  "-Dvertx.disableTCCL=true",
  "-Dvertx.disableHttpHeadersValidation=true",
})
@Benchmark
public void vertxOpt() {
 GET.setIndex(readerIndex, writeIndex);
 vertxChannel.writeInbound(GET);
 ByteBuf result = (ByteBuf) vertxChannel.outboundMessages().poll();
 consume(result);
}