从Netty Handler内部访问Netty服务器的实例(Accessing an instance of Netty server from inside a Netty Handler)

 我正在为多人游戏编写Netty服务器，我不确定是否需要以某种方式同步服务器中但由ChannelHandler访问的变量。 
 
 在服务器级别，我使用ArrayList来存储服务器将要服务的不同匹配。 
 
 每个匹配将引用2个通道（我为每个匹配存储ChannelHandlerContetx）。 
 
 当我创建从SimpleChannelInboundHandler扩展的ChannelHandler时，我将服务器的实例传递给构造函数，并将服务器作为实例变量存储在处理程序中。 
 
 当触发channelActive时，ChannerlHandler将在“等待”状态下搜索ArrayList（它位于服务器实例中）中的匹配项。 如果找到一个绑定它并改变匹配状态。 如果不是，则创建新的匹配，然后通道绑定到它，使其处于等待状态。 
 
 我知道频道是线程安全的。 但是这里不同的通道正在访问同一服务器的ArrayList实例。 
 
 在这种情况下，我应该注意同步对ArrayList的访问吗？ 
 
 注意如果它添加到我的问题：因为我将在后端有一个数据库，我在创建处理程序时在.addLast（）方法中传递一个DefaultEventExecutor。 

I am writting a Netty Server for a multiplayer game and I am not sure if I need to synchronize in some way a variable that lives in the server but is accessed by the ChannelHandler.
 
At the server level I am using an ArrayList to store the different matches the server will be serving.
 
Each match will be referencing 2 channels (I store for the match the ChannelHandlerContetx for each one).
 
When I create the ChannelHandler that extends from SimpleChannelInboundHandler I pass an instance of the server to the constructor and I store the server as an instance variable in the handler.
 
When channelActive is fired, the ChannerlHandler will search for a match in the ArrayList (that lives in the server instance) in "Waiting" state. If it finds one it bounds to it and changes the match status. If not a new Match is created and then the channel bounds to it leaving it in Waiting status.
 
I know that channels are Thread Safe. But here the different channels are accessing the same server's ArrayList instance.
 
In this case should I take care of synchronizing the access to the ArrayList?
 
Note in case it adds to my question: As I am going to have a database on the backend, I am passing a DefaultEventExecutor in the .addLast() method when the handler is being created.

原文：https://stackoverflow.com/questions/23840097