Channel concept & implementation— el Project (2)

AbstractChannelHandlerContext.java

public abstract class AbstractChannelHandlerContext implements ChannelHandlerContext {
  AbstractChannelHandlerContext(
      String name,
      ChannelPipeline pipeline,
      EventLoop eventLoop,
      Class<? extends ChannelHandler> handlerClass) {
    this.name = ObjectUtil.checkNotNull(name, "name");
    this.pipeline = pipeline;
    this.executionFlag = ChannelHandlerFlag.flag(handlerClass);
    this.eventLoop = eventLoop;
  }
  ...
}

final class ChannelHandlerFlag {
  static final int FLAG_INBOUND = 0;
  static final int FLAG_OUTBOUND = 1;
  static final int FLAG_INOUTBOUND = 2;

  static int flag(Class<? extends ChannelHandler> clazz) {
    if (ChannelInboundHandler.class.isAssignableFrom(clazz)
        && ChannelOutboundHandler.class.isAssignableFrom(clazz)) {
      return FLAG_INOUTBOUND;
    }
    if (ChannelInboundHandler.class.isAssignableFrom(clazz)) {
      return FLAG_INBOUND;
    }
    return FLAG_OUTBOUND;
  }
}