宜人贷蜂巢API网关技能解密之Netty行使实践

DefaultEventExecutorChooserFactory按照线程数建设详细的EventExecutorChooser，线程数假如便是2^n，可行使按位与更换取模运算，节减cpu的计较资源，见源码：

@SuppressWarnings("unchecked")  
@Override  
public EventExecutorChooser newChooser(EventExecutor[] executors) {  
    if (isPowerOfTwo(executors.length)) {  
        return new PowerOfTowEventExecutorChooser(executors);  
    } else {  
        return new GenericEventExecutorChooser(executors);  
    }  
}   
    private static final class PowerOfTowEventExecutorChooser implements EventExecutorChooser {  
        private final AtomicInteger idx = new AtomicInteger();  
        private final EventExecutor[] executors;   
 
        PowerOfTowEventExecutorChooser(EventExecutor[] executors) {  
            this.executors = executors;  
        }   
 
        @Override  
        public EventExecutor next() {  
            return executors[idx.getAndIncrement() & executors.length - 1];  
        }  
    }   
 
    private static final class GenericEventExecutorChooser implements EventExecutorChooser {  
        private final AtomicInteger idx = new AtomicInteger();  
        private final EventExecutor[] executors;   
 
        GenericEventExecutorChooser(EventExecutor[] executors) {  
            this.executors = executors;  
        }   
 
        @Override  
        public EventExecutor next() {  
            return executors[Math.abs(idx.getAndIncrement() % executors.length)];  
        }  
    } 

newChild(executor, args)的建设细节，见下：

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