三、RabbitMQ-客户端源码之ChannelManager

关于ChannelManager，官方注解：Manages a set of channels, indexed by channel number (1… _channelMax)。

ChannelManager类的代码量不是很多，主要用来管理Channel的，channelNumber=0的除外，应为channelNumber=0是留给Connection的特殊的channelNumber。

下面是ChannelManager的成员变量：

/** Monitor for _channelMap and channelNumberAllocator */
private final Object monitor = new Object();
    /** Mapping from 1.._channelMax to {@link ChannelN} instance */
    private final Map
   
     
      
     _channelMap = new HashMap
    
      
       
     ();
    private final IntAllocator channelNumberAllocator;
private final ConsumerWorkService workService;
private final Set
     
       
        
       shutdownSet = new HashSet
      
        
         
       ();
/** Maximum channel number available on this connection. */
private final int _channelMax;
private final ThreadFactory threadFactory;

这上面的成员变量下面会有涉及。

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对于ChannelManager的使用，是AMQConnection中的成员变量：

/** Object that manages a set of channels */
private volatile ChannelManager _channelManager;