异常

++++ exception thrown while trying to get object from cache for key: s2i1-E%2573gyod66%2B1%25%25al%25%25yDue%25ila4xQp3ns%25irrloPteLvPsel372D3lu_2D%2B_af675c67093ec75db15b6d740733bd87_775183877_1837512; host:10.4.37.175:11241 -- null
java.nio.channels.ClosedByInterruptException
at java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:184)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:272)
at sun.nio.ch.SocketAdaptor$SocketInputStream.read(SocketAdaptor.java:195)
at sun.nio.ch.ChannelInputStream.read(ChannelInputStream.java:86)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
at java.io.DataInputStream.read(DataInputStream.java:132)
at com.ycache.danga.MemCached.SockIOPool$SockIO.readLine(SockIOPool.java:2023)
at com.ycache.danga.MemCached.MemCachedClient.get(MemCachedClient.java:1565)
at com.ycache.danga.MemCached.MemCachedClient.get(MemCachedClient.java:1489)

原因：
调用方使用了 Thread. Interrupt 方法 或者 Future.cancel方法。
解决办法：
1. 调用ycache的线程中，去掉Future.cancel 或者 Thread. Interrupt 方法使用
2. 通过抛出异常的方法

过程分析

1. 当调用方使用ycache的MemCachedClient.get方法时，就会调用SocketChannelImpl.read 方法，在读取运行 begin方法，执行后使用 end方法

   public int read(ByteBuffer dst) throws IOException {
   
               try {
                   begin();
                   bytesRead = in.read(buf, 0, bytesToRead);
               } finally {
                   end(bytesRead > 0);
               }
               if (bytesRead < 0)
                   break;
               else
                   totalRead += bytesRead;
               dst.put(buf, 0, bytesRead);
           }
           if ((bytesRead < 0) && (totalRead == 0))
               return -1;
   
           return totalRead;
       }
   }
   

2. begin()会创建Interruptible 的interruptor 对象，同时将此对象赋值给了当前 Thread的 blocker对象 interruptor = new Interruptible() {
   public void interrupt() {
   synchronized (closeLock) {
   if (!open)
   return;
   interrupted = true;
   open = false;
   try {
   AbstractInterruptibleChannel.this.implCloseChannel(); // 关掉ChanelSocket
   } catch (IOException x) { }
   }
   }};

3. 当 in.read 在执行且尚未执行完，此时调用方代码 执行了Thread. Interrupt 或者 Future.cancel 时，就会调用当前线程的blocker的interrupt方法，将interrupted 设置为true，同时关掉socket

public void interrupt() {
if (this != Thread.currentThread())
    checkAccess();

synchronized (blockerLock) {
    Interruptible b = blocker;
    if (b != null) {
interrupt0();// Just to set the interrupt flag
b.interrupt();
return;
    }
}
interrupt0();
}

1. end(false)，当没有读取到数据或者读取超时时，就会发生ClosedByInterruptException，代码如下

protected final void end(boolean completed)
    throws AsynchronousCloseException
    {
    blockedOn(null);
    if (completed) {
        interrupted = false;
        return;
    }
    if (interrupted) throw new ClosedByInterruptException();
    if (!open) throw new AsynchronousCloseException();
    }