Eclipse插件:启动后立即运行代码

Question

我想在插件启动后立即显示一条消息.如果我将我的代码放在Activator.start()方法的末尾,我会收到一个错误(可能是因为尚未加载所需的资源).

错误看起来像这样:

!MESSAGE While loading class "de.stefansurkamp.package.ClassIWantToLoad", thread "Thread[main,6,main]" timed out waiting (5006ms) for thread "Thread[Worker-2,5,main]" to finish starting bundle "MyPlugin_1.0.0.qualifier [302]". To avoid deadlock, thread "Thread[main,6,main]" is proceeding but "de.stefansurkamp.package.ClassIWantToLoad" may not be fully initialized.
!STACK 0
org.osgi.framework.BundleException: State change in progress for bundle "reference:file:/C:/Users/Stefan/workspace/MyPlugin/" by thread "Worker-2".
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.beginStateChange(AbstractBundle.java:1088)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:298)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:478)
    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:263)
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:109)
    [...]
Caused by: org.eclipse.osgi.framework.internal.core.AbstractBundle$BundleStatusException
    ... 53 more
Root exception:
org.eclipse.osgi.framework.internal.core.AbstractBundle$BundleStatusException
    [...]

如果需要,我可以提供完整的堆栈跟踪.

那么有没有任何方法在start()完成后立即运行？

编辑:使用作业和org.eclipse.ui.startup

根据greg的建议,我在一个由org.eclipse.ui.startup扩展点加载的类中创建了一个Job .

这是我的earlyStartup()方法的样子:

@Override
public void earlyStartup() {        
    Job clearPrefsJob = new Job("clearPrefsJob") {

        @Override
        protected IStatus run(IProgressMonitor monitor) {
            try {
                DataStorage dataStorage = new DataStorage();
                dataStorage.clearPrefs();
                System.out.println("Everything gone.");
            }
            catch (StorageException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
        }

    };

    clearPrefsJob.addJobChangeListener(new IJobChangeListener() {
        (All of the IchangeEvents here)
    });

    clearPrefsJob.setPriority(Job.BUILD);
    clearPrefsJob.schedule();

我的控制台打印Everything gone.和我正在完成作业的调试消息(由作业更改侦听器).

但就在那之后我收到一条错误消息:

!ENTRY org.eclipse.core.jobs 4 2 2014-07-29 11:53:12.481
!MESSAGE An internal error occurred during: "clearPrefsJob".
!STACK 0
java.lang.NullPointerException
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:69)

此外,我的测试环境显示以下错误消息:

'clearPrefsJob' has encountered a problem.
   An internal error occured during: "clearPrefsJob".
   java.lang.NullPointerException

我不知道代码的这一部分中的NullPointerException应该来自哪里,因为在使用作业之前一切正常.

解:

看起来问题正在使用return null.使用return Status.OK_STATUS(或类似)时一切都很顺利.

Answer 1

您可以在方法中创建一个Job(org.eclipse.core.runtime.jobs.Job)start并安排它运行.

如果您的代码需要与UI交互使用UIJob.

或者,您可以使用org.eclipse.ui.startup扩展点在Eclipse启动时尽早运行类(但这对于您想要执行的操作可能为时过早,因此可能仍需要Job).

您也可以为您的班级使用OSGi服务.