Subscribing topic take too long. Then my code cannot run correctly.

I'm using subscribing topic. But it will not catch the event because of too slow to subscribe.

I have two code to subscribing VCS_CONFIGURATION_MANAGER.

One is  a ProjectComponent which subscribe when project opened.

One is a toolWindow which subscribe when toolwindow opened.

ProjectComponent code is like this.

private volatile boolean vcsInitialized;

@Override
public void projectOpened() {
    vcsInitialized = false;
    System.out.println("projectOpened() -> "+myProject.getName());
    myProject.getMessageBus().connect().subscribe(ProjectLevelVcsManager.VCS_CONFIGURATION_CHANGED, new VcsListener() {
        @Override
        public void directoryMappingChanged() {
            vcsInitialized = true;
            System.out.println("DirectoryMappingChanged:"+myProject.getName());
        }
    });
}

This is watching VCS_CONFIGURATION_CHANGED.

The toolwindow code is like this.

if(<<ProjectComponentClass>>.getInstance(project).isVcsInitialized()) {
    System.out.println("if isVcsInitialized");
    doSomething();
} else {
    System.out.println("else isVcsInitialized");
    project.getMessageBus().connect().subscribe(ProjectLevelVcsManager.VCS_CONFIGURATION_CHANGED, new VcsListener() {
        @Override
        public void directoryMappingChanged() {
            System.out.println("toolWindow:directoryMappingChanged");
            doSomething();
        }
    });
    System.out.println("finish subscribe");
}

This means Toolwindow code check the ProjectComponent instance's vcsInitialized bool value.

If VCS is not initialzied, listen the VCS_CONFIGURATION_CHANGED.

But this code output like this.

projectOpened() -> intellij-plugin
else isVcsInitialized
finish subscribe
DirectoryMappingChanged:intellij-plugin

The code should outpout  

toolWindow:directoryMappingChanged

(This is in VcsListener#directoryMappingChanged()).

But no output come and code does not run.

This means that when the code is subscribing the topic by

project.getMessageBus().connect().subscribe()

the event of VCS_CONFIGURATION_CHANGED is happened.

So the code cannot run.

How should I do with this??