Java 连接池和线程中断()
我使用它来处理多线程环境中的数据库连接池。这个问题可能与其他池LIB有关,但这就是我的问题 最近,我需要直接或间接地使用c3p0在这样的线程上实现离子处理,并注意到如果Java 连接池和线程中断(),java,connection-pooling,c3p0,interrupt-handling,interrupted-exception,Java,Connection Pooling,C3p0,Interrupt Handling,Interrupted Exception,我使用它来处理多线程环境中的数据库连接池。这个问题可能与其他池LIB有关,但这就是我的问题 最近,我需要直接或间接地使用c3p0在这样的线程上实现离子处理,并注意到如果interrupt()在c3p0Datasource.getConnection()试图从池中获取连接时被正确调用,它会抛出InterruptedException 显然,这是因为wait() 酷。问题是如何正确地处理这一问题——两种情况都是a)您希望在线程终止之前继续事务,以及b)您希望中止 我尝试了一个似乎效果不错的解决方案(
interrupt()
在c3p0Datasource.getConnection()
试图从池中获取连接时被正确调用,它会抛出InterruptedException
显然,这是因为wait()
酷。问题是如何正确地处理这一问题——两种情况都是a)您希望在线程终止之前继续事务,以及b)您希望中止
我尝试了一个似乎效果不错的解决方案(发布为答案)——事实上,我认为这个主题已经结束了。请随意插手,否则,谢谢 我做了一个简单的测试,在1秒内启动了大量的连接
请求,每次确保池瓶颈时执行一个SELECT,然后调用中断()
我发现连接
对象在中断异常
被捕获后状态良好,即使堆栈跟踪显示我在等待可用(…)
时c3p0崩溃。就在这一秒,我正在检查它们的源代码,当然,它们处理中断异常。他们甚至发出了适当的警告:
WARNING: com.mchange.v2.resourcepool.BasicResourcePool@5bcf4b61 -- an attempt to checkout a resource was interrupted, and the pool is still live: some other thread must have either interrupted the Thread attempting checkout!
告诉我们它仍然是活的,尽管在很多单词fuzz之间。解决了
这是测试
ComboPooledDataSource ds = new ComboPooledDataSource();
// testing with various pool sizes - same effect
ds.setMinPoolSize(1);
ds.setMaxPoolSize(5);
ds.setInitialPoolSize(2);
Thread connectingThread = new Thread() {
public void run() {
Connection cnxn = null;
while (true) {
try {
cnxn = ds.getConnection();
System.out.println("Got connection.);
executeQuery(cnxn);
} catch (SQLException e) {
System.out.println("Got exception.");
e.printStackTrace();
// SOLUTION:
Throwable cause = e.getCause();
if (cause instanceof InterruptedException) {
System.out.println("Caught InterruptedException! Cnxn is " + cnxn);
// note that cnxn is a com.mchange.v2.c3p0.impl.NewProxyConnection
// also note that it's perfectly healthy.
//
// You may either want to:
// a) use the cnxn to submit your the query
executeQuery(cnxn);
cnxn.close()
// b) handle a proper shutdown
cnxn.close();
}
break;
}
}
};
};
connectingThread.start();
try {
Thread.sleep(1000);
} catch (InterruptedException e) { e.printStackTrace(); }
connectingThread.interrupt();
ComboPooledDataSource ds = new ComboPooledDataSource();
// testing with various pool sizes - same effect
ds.setMinPoolSize(1);
ds.setMaxPoolSize(5);
ds.setInitialPoolSize(2);
Thread connectingThread = new Thread() {
public void run() {
Connection cnxn = null;
while (true) {
try {
cnxn = ds.getConnection();
System.out.println("Got connection.);
executeQuery(cnxn);
} catch (SQLException e) {
System.out.println("Got exception.");
e.printStackTrace();
// SOLUTION:
Throwable cause = e.getCause();
if (cause instanceof InterruptedException) {
System.out.println("Caught InterruptedException! Cnxn is " + cnxn);
// note that cnxn is a com.mchange.v2.c3p0.impl.NewProxyConnection
// also note that it's perfectly healthy.
//
// You may either want to:
// a) use the cnxn to submit your the query
executeQuery(cnxn);
cnxn.close()
// b) handle a proper shutdown
cnxn.close();
}
break;
}
}
};
};
connectingThread.start();
try {
Thread.sleep(1000);
} catch (InterruptedException e) { e.printStackTrace(); }
connectingThread.interrupt();