java - Vertx 连接超时未捕获 JDBCClient (.getConnection)

Question

我无法处理 JDBCClient 中连接失败的情况，例如:没有主机可路由、连接超时等。因为方法 .getConnection() 不返回 failedFuture 但它在监视器中显示原因，然后它将保持沉默。我认为当连接超时或其他原因时，它应该发送失败 future 而不是打印错误日志。

我的示例代码是。

JDBCClient client = ...;
client.getConnection(conn -> {
    if (conn.succeeded()) {
        ....
    } else {
        // This is never executed (connection time out and etc.)
        handler.handle(Future.failedFuture(conn.cause()));
    }
});

我在日志中收到此错误:

An attempt by a client to checkout a Connection has timed out.
java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
    at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:118) 
    at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:77) 
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:690) 
    at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:140) 
    at JDBCClient.lambda$getConnection$1(JDBCClient.java:132) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) ~[?:1.8.0_144]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) ~[?:1.8.0_144]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@16404129 -- timeout at awaitAvailable()
    at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1467) 
    at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:644) 
    at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:554) 
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:758) 
    at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:685) 
    ... 5 more

请有人帮助我。

谢谢。

Answer 1

你可以尝试做这样的事情:

  public Future<SQLConnection> tryConnect() {
    JDBCClient client = JDBCClient.createNonShared(vertx, config());
    Future<SQLConnection> future = Future.future();
    client.getConnection(it -> {
      if (it.succeeded()) {
        future.complete(it.result());
      } else {
        future.fail(it.cause());
      }
    });
    return future;
  }

只需手动创建 future，然后在回调中解决或拒绝它。这实际上是此类情况的常见方法。