com.sun.jdi.event.MethodEntryEvent Java Examples

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Example #1
Source File: DebugUtility.java    From java-debug with Eclipse Public License 1.0 6 votes vote down vote up 
/**
 * Suspend the main thread when the program enters the main method of the specified main class.
 * @param debugSession
 *                  the debug session.
 * @param mainClass
 *                  the fully qualified name of the main class.
 * @return
 *        a {@link CompletableFuture} that contains the suspended main thread id.
 */
public static CompletableFuture<Long> stopOnEntry(IDebugSession debugSession, String mainClass) {
    CompletableFuture<Long> future = new CompletableFuture<>();

    EventRequestManager manager = debugSession.getVM().eventRequestManager();
    MethodEntryRequest request = manager.createMethodEntryRequest();
    request.addClassFilter(mainClass);
    request.setSuspendPolicy(EventRequest.SUSPEND_EVENT_THREAD);

    debugSession.getEventHub().events().filter(debugEvent -> {
        return debugEvent.event instanceof MethodEntryEvent && request.equals(debugEvent.event.request());
    }).subscribe(debugEvent -> {
        Method method = ((MethodEntryEvent) debugEvent.event).method();
        if (method.isPublic() && method.isStatic() && method.name().equals("main")
                && method.signature().equals("([Ljava/lang/String;)V")) {
            deleteEventRequestSafely(debugSession.getVM().eventRequestManager(), request);
            debugEvent.shouldResume = false;
            ThreadReference bpThread = ((MethodEntryEvent) debugEvent.event).thread();
            future.complete(bpThread.uniqueID());
        }
    });
    request.enable();

    return future;
}