如何从命令行停止OSGI应用程序 [英] How to stop an OSGI Application from command line
问题描述
我有一个运行的osgi(equinox容器)应用程序。它将通过bash脚本启动。 查看felix gogo shell
I do have a running osgi (equinox container) application. It will been started via a bash script. See felix gogo shell
java -jar ... _osgi.jar -console 1234 &
这一切都很好,我也可以通过
This all works pretty well and I also can stop it via
telnet localhost 1234
<osgi>stop 0
但我正在寻找的是如何将其嵌入到bash脚本中以停止osgi应用程序。
But what I am looking for is how can I embed this into a bash script to stop the osgi application.
我已经尝试过这个
echo stop 0 | telnet localhost 1234
但这不起作用。所以如果有人知道如何把它放在一个bash脚本中,请告诉我。
but this doesn't work. So if someone has idea how to put this in a bash script, please let me know.
推荐答案
Telnet到Gogo shell似乎像一个非常脆弱的解决方案。为什么不编写应用程序来支持标准POSIX信号处理?然后你可以用 kill -s TERM< pid>
来杀死它。
Telneting into the Gogo shell seems like an awfully fragile solution. Why not write your application to support standard POSIX signal handling? Then you could simply kill it with kill -s TERM <pid>
.
例如以下的捆绑激活器安装一个干净关闭框架的关闭钩子,等效于 stop 0
:
For example the following bundle activator installs a shutdown hook that cleanly shuts down the framework, equivalently to stop 0
:
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.launch.Framework;
public class ShutdownHookActivator implements BundleActivator {
@Override
public void start(final BundleContext context) {
Thread hook = new Thread() {
@Override
public void run() {
System.out.println("Shutdown hook invoked, stopping OSGi Framework.");
try {
Framework systemBundle = context.getBundle(0).adapt(Framework.class);
systemBundle.stop();
System.out.println("Waiting up to 2s for OSGi shutdown to complete...");
systemBundle.waitForStop(2000);
} catch (Exception e) {
System.err.println("Failed to cleanly shutdown OSGi Framework: " + e.getMessage());
e.printStackTrace();
}
}
};
System.out.println("Installing shutdown hook.");
Runtime.getRuntime().addShutdownHook(hook);
}
@Override
public void stop(BundleContext context) throws Exception {
}
}
注意:如果您控制启动OSGi框架的启动程序代码,您应该在那里安装关闭钩子而不是单独捆绑。
NB: if you are in control of the launcher code that starts the OSGi Framework, you should probably install the shutdown hook there rather from a separate bundle.
在bash中, $!
变量计算结果为上次执行的后台命令的PID。您可以将其保存到您自己的变量中以供日后参考,例如:
In bash, the $!
variable evaluates to the PID of the last executed background command. You can save this into your own variable for later reference, e.g.:
# Launch app:
java -jar ... &
MY_PID=$!
# Later when you want to stop your app:
kill $MY_PID
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