昨天 AWS 的 RDS 出现故障——我们的数据库也是如此。
发生这种情况时，C3P0 将尝试获取数据库连接并挂起。我显然希望我的应用程序在这些情况下返回错误页面，而不是永远等待响应。
代码如下所示：
ComboPooledDataSource db = new ComboPooledDataSource();
...
Connection conn = db.getConnection();
如何设置从 c3p0 的连接池获取连接的超时时间？
我认为 checkoutTimeout() 会是它——但它不是。它是“客户端调用 getConnection() 将等待连接签入或在池耗尽时获取连接的毫秒数。” 由于池未用完（它只是不可用），这不适用。
我还认为 setAcquireRetryAttempts 和 setAcquireIncrement 会起作用——但它们不起作用，因为连接不会失败，只是没有响应。
当我拉出整个堆栈时，这就是它停止的地方：
SocketInputStream.socketRead0(FileDescriptor, byte[], int, int, int) line: not available [native method]
SocketInputStream.read(byte[], int, int) line: 129
ReadAheadInputStream.fill(int) line: 113
ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(byte[], int, int) line: 160
ReadAheadInputStream.read(byte[], int, int) line: 188
MysqlIO.readFully(InputStream, byte[], int, int) line: 2428
MysqlIO.reuseAndReadPacket(Buffer, int) line: 2882
MysqlIO.reuseAndReadPacket(Buffer) line: 2871
MysqlIO.checkErrorPacket(int) line: 3414
MysqlIO.sendCommand(int, String, Buffer, boolean, String) line: 1936
MysqlIO.sqlQueryDirect(StatementImpl, String, String, Buffer, int, int, int, boolean, String, Field[]) line: 2060
JDBC4Connection(ConnectionImpl).execSQL(StatementImpl, String, int, Buffer, int, int, boolean, String, Field[], boolean) line: 2542
JDBC4PreparedStatement(PreparedStatement).executeInternal(int, Buffer, boolean, boolean, Field[], boolean) line: 1734
JDBC4PreparedStatement(PreparedStatement).executeQuery() line: 1885
NewProxyPreparedStatement.executeQuery() line: 76
C3P0PooledConnectionPoolManager.initializeAutomaticTestTable(String, DbAuth) line: 799
C3P0PooledConnectionPoolManager.createPooledConnectionPool(DbAuth) line: 696
C3P0PooledConnectionPoolManager.getPool(DbAuth) line: 257
C3P0PooledConnectionPoolManager.getPool() line: 271
ComboPooledDataSource(AbstractPoolBackedDataSource).getNumThreadsAwaitingCheckoutDefaultUser() line: 203
NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]
NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25
Method.invoke(Object, Object...) line: 597
BeansUtils.extractAccessiblePropertiesToMap(Map, Object, Collection) line: 359
BeansUtils.appendPropNamesAndValues(StringBuffer, Object, Collection) line: 324
ComboPooledDataSource.toString() line: 539
ComboPooledDataSource(AbstractPoolBackedDataSource).getPoolManager() line: 462
ComboPooledDataSource(AbstractPoolBackedDataSource).getConnection() line: 128
当我用谷歌搜索“socketRead0 timeout”和“socketRead0 hang”时——我看到了很多问题，但没有真正的解决方案。
有没有办法在这里强制超时？
谢谢！