Sofa之ConnectionManager

Sofa-rpc版本5.6.1

如下ConnectionManager定義了創建/刪除Connection的方法，默認實現時DefaultConnectionManager

如下List-1和List-2，創建ConnectionPool實際是在ConectionPoolCall(實現了Callable)裏面執行的，之後把ConnectionPool放入connTasks中，這是全局變量，ConnectionPool中再加入Connection

List-1

public void add(Connection connection, String poolKey) {
    ConnectionPool pool = null;
    try {
        // get or create an empty connection pool
        pool = this.getConnectionPoolAndCreateIfAbsent(poolKey, new ConnectionPoolCall());
    } catch (Exception e) {
        // should not reach here.
        logger.error(
            "[NOTIFYME] Exception occurred when getOrCreateIfAbsent an empty ConnectionPool!",
            e);
    }
    if (pool != null) {
        pool.add(connection);
    }
    ...
}

List-2

private ConnectionPool getConnectionPoolAndCreateIfAbsent(String poolKey,
                                                            Callable<ConnectionPool> callable)
                                                                                            throws RemotingException,
                                                                                            InterruptedException {
    RunStateRecordedFutureTask<ConnectionPool> initialTask = null;
    ConnectionPool pool = null;

    int retry = DEFAULT_RETRY_TIMES;

    int timesOfResultNull = 0;
    int timesOfInterrupt = 0;

    for (int i = 0; (i < retry) && (pool == null); ++i) {
        initialTask = this.connTasks.get(poolKey);
        if (null == initialTask) {
            initialTask = new RunStateRecordedFutureTask<ConnectionPool>(callable);
            initialTask = this.connTasks.putIfAbsent(poolKey, initialTask);
            if (null == initialTask) {
                initialTask = this.connTasks.get(poolKey);
                initialTask.run();
            }
        }
    ...
    return pool;
}

create方法如下，內部其實是使用ConnectionFactory進行創建的。

List-3

@Override
public Connection create(String ip, int port, int connectTimeout) throws RemotingException {
    Connection conn = null;
    try {
        conn = this.connectionFactory.createConnection(ip, port, connectTimeout);
    } catch (Exception e) {
        throw new RemotingException("Create connection failed. The address is " + ip + ":"
                                    + port, e);
    }
    return conn;
}

/**
    * @see com.alipay.remoting.ConnectionManager#create(java.lang.String, int)
    */
@Override
public Connection create(String address, int connectTimeout) throws RemotingException {
    Url url = this.addressParser.parse(address);
    url.setConnectTimeout(connectTimeout);
    return create(url);
}