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在Netty中存在四种创建连接的方式：

1. newConnection：每次都是新链接
2. elastic：弹性连接池

   static ConnectionProvider elastic(String name, @Nullable Duration maxIdleTime, @Nullable Duration maxLifeTime) {		return builder(name).maxConnections(Integer.MAX_VALUE)		                    .pendingAcquireTimeout(Duration.ofMillis(0))		                    .pendingAcquireMaxCount(-1)		                    .maxIdleTime(maxIdleTime)		                    .maxLifeTime(maxLifeTime)		                    .build();	}

    

3. fixed：固定连接池

   static ConnectionProvider fixed(String name, int maxConnections, long acquireTimeout, @Nullable Duration maxIdleTime, @Nullable Duration maxLifeTime) {		if (maxConnections == -1) {			return elastic(name, maxIdleTime, maxLifeTime);		}		if (acquireTimeout < 0) {			throw new IllegalArgumentException("Acquire Timeout value must be positive");		}		return builder(name).maxConnections(maxConnections)		                    .pendingAcquireMaxCount(-1) // keep the backwards compatibility		                    .pendingAcquireTimeout(Duration.ofMillis(acquireTimeout))		                    .maxIdleTime(maxIdleTime)		                    .maxLifeTime(maxLifeTime)		                    .build();	}

    

4. builder：自定义连接池，通过bulider模式设置参数

   builder(name).maxConnections(maxConnections)		                    .pendingAcquireMaxCount(-1) // keep the backwards compatibility		                    .pendingAcquireTimeout(Duration.ofMillis(acquireTimeout))		                    .maxIdleTime(maxIdleTime)		                    .maxLifeTime(maxLifeTime)		                    .build();

    

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