Question

我使用LongUIOperation自定义实现，但有时候，使用

Executions.deactivate(getNativeDesktop());

我在屏幕上收到消息框并且：

dic 11,2017 11:09:42 AM org.zkoss.zk.ui.impl.UiEngineImpl handleError GRAVE：java.lang.NullPointerException at org.apache.catalina.connector.Request.notifyAttributeAssigned（Request.java:1528）在 org.apache.catalina.connector.Request.setAttribute（Request.java:1514）在 org.apache.catalina.connector.RequestFacade.setAttribute（RequestFacade.java:540）在 org.zkoss.zk.ui.http.ExecutionImpl.setAttribute（ExecutionImpl.java:497）在org.zkoss.zk.ui.impl.Utils.getComponentInfos（Utils.java:120）at org.zkoss.zk.ui.impl.Utils.setComponentInfo（Utils.java:129）at org.zkoss.zk.ui.impl.AbstractUiFactory.newComponent（AbstractUiFactory.java:137）在 org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0（UiEngineImpl.java:919）在 org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild（UiEngineImpl.java:889）在 org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0（UiEngineImpl.java:776）在org.zkoss.zk.ui.impl.UiEngineImpl.access $ 800（UiEngineImpl.java:128）在 org.zkoss.zk.ui.impl.UiEngineImpl $ TemplateImpl.create（UiEngineImpl.java:2318）在 org.zkoss.bind.impl.BindListitemRenderer.render（BindListitemRenderer.java:79）在org.zkoss.zul.Listbox $ Renderer.render（Listbox.java:2769）at at org.zkoss.zul.Listbox.doInitRenderer（Listbox.java:2584）at org.zkoss.zul.Listbox.onInitRender（Listbox.java:2537）at sun.reflect.GeneratedMethodAccessor2366.invoke（未知来源）at sun.reflect.DelegatingMethodAccessorImpl.invoke（未知来源）at java.lang.reflect.Method.invoke（未知来源）at org.zkoss.zk.ui.AbstractComponent.service（AbstractComponent.java:3146）在 org.zkoss.zk.ui.AbstractComponent.service（AbstractComponent.java:3077）在 org.zkoss.zk.ui.impl.EventProcessor.process（EventProcessor.java:138）在 org.zkoss.zk.ui.impl.UiEngineImpl.processEvent（UiEngineImpl.java:1846）在org.zkoss.zk.ui.impl.UiEngineImpl.process（UiEngineImpl.java:1618）在org.zkoss.zk.ui.impl.UiEngineImpl.endUpdate（UiEngineImpl.java:1222）在 org.zkoss.zkex.ui.comet.CometServerPush.deactivate（CometServerPush.java:522）在 org.zkoss.zk.ui.impl.DesktopImpl.deactivateServerPush（DesktopImpl.java:1596）在org.zkoss.zk.ui.Executions.deactivate（Executions.java:1011）at at com.ims.web.ui.GenericViewModel.deactivateNativeDesktop（GenericViewModel.java:193）在 com.ims.web.zk.ui.DesktopVMLongUIOperation.run（DesktopVMLongUIOperation.java:186）在java.lang.Thread.run（未知来源）

用例示例：

@Command    
@Override
public void editBaseItem() throws Exception {
    super.editBaseItem();
    if(selectedBaseItem.getOid() == null){
        initNewItem();
    }
    final String sessionID = getSessionID();
    final StaffDailyAvailabilityVM instanceVM = this;
    new DesktopVMLongUIOperation(this,win,Labels.getLabel("def.msg.refreshdata","Refresh data...")) {
        @Override
        protected void execute() throws InterruptedException {
            try {
                StaffDailyAvailabilityManager.evaluateStaffDailyAvailabilitySynch(selectedBaseItem, sessionID);
            } catch (Exception e) {
                logger.error(e,e);
            }
        }

        protected void onCleanup() {
            try {
                //refresh clock time list
                selectedBaseItem.getLastStaffDailyTimestampDTO();
                if(selectedBaseItem.isErrorDetected()){
                    selectedBaseItem.setCertified(false);
                }
                BindUtils.postNotifyChange(null, null, instanceVM.getSelectedBaseItem(),"lastStaffDailyTimestampDTO");
                BindUtils.postNotifyChange(null, null, instanceVM, "selectedBaseItem");
            } catch (Exception e) {
                logger.error(e,e);
            }
        };

    }.start();
}

这里是代码：

公共抽象类DesktopVMLongUIOperation实现Runnable { protected static final Logger logger = Logger.getLogger（DesktopVMLongUIOperation.class）; 私有线程线程; private AtomicBoolean canceled = new AtomicBoolean（false）; 私人窗口胜利; private GenericViewModel genericViewModel;

public DesktopVMLongUIOperation(GenericViewModel genericViewModel){
    this(genericViewModel,null,"");
}

public DesktopVMLongUIOperation(GenericViewModel genericViewModel, Window win, String busyMsg){
    this.win = win;
    this.genericViewModel = genericViewModel;
    try {
        this.genericViewModel.enableServerPush(null);
        if(win != null){
            Clients.showBusy(win,busyMsg);
        }
    } catch (Exception e) {
        logger.error(e,e);
    }
}

/**
 * asynchronous callback for your long operation code
 * @throws InterruptedException
 */
protected abstract void execute() throws InterruptedException;

/**
 * optional callback method when the task has completed successfully
 */
protected void onFinish() {};
/**
 * optional callback method when the task has been cancelled or was interrupted otherwise
 */
protected void onCancel() {};
/**
 * optional callback method when the task has completed with an uncaught RuntimeException
 * @param exception
 */
protected void onException(RuntimeException exception) {
    logger.error(exception,exception);
};
/**
 * optional callback method when the task has completed (always called)
 */
protected void onCleanup() {};

/**
 * set the cancelled flag and try to interrupt the thread 
 */
public final void cancel() {
    try {
        cancelled.set(true);
        if(thread != null){
            thread.interrupt();
        }
    } catch (Throwable e) {
        logger.error(e,e);
    }
}

/**
 * check the cancelled flag
 * @return
 */
public final boolean isCancelled() {
    return cancelled.get();
}

/**
 * Checks if the task thread has been interrupted. Use this to check whether or not to exit a busy operation in case.  
 * @throws InterruptedException when the current task has been cancelled/interrupted
 */
protected final void checkCancelled() throws InterruptedException {
    try {
        if(Thread.currentThread() != this.thread) {
            throw new IllegalStateException("this method can only be called in the worker thread (i.e. during execute)");
        }
        boolean interrupted = Thread.interrupted();
        if(interrupted || cancelled.get()) {
            cancelled.set(true);
            throw new InterruptedException();
        }
    } catch (Throwable e) {
        logger.error(e,e);
    }
}

/**
 * launch the long operation
 */
public final void start() {
    try {
        thread = new Thread(this);
        thread.start();
    } catch (Throwable e) {
        logger.error(e,e);
    }
}

@Override
public final void run() {
    try {
        try {
            checkCancelled(); //avoid unnecessary execution
            execute();
            checkCancelled(); //final cancelled check before calling onFinish
            genericViewModel.activateNativeDesktop();
            logger.error("ACTIVATE: RUN");
            onFinish();
        } catch (InterruptedException e) {
            try {
                cancelled.set(true);
                genericViewModel.activateNativeDesktop();
                logger.error("ACTIVATE: INTERRUPT");
                onCancel();
            } catch (InterruptedException e1) {
                throw new RuntimeException("interrupted onCancel handling", e1);
            } catch (Exception e1) {
                logger.error(e1,e1);
            } finally {
                try {
                    genericViewModel.deactivateNativeDesktop();
                    logger.error("DEACTIVATE: INTERRUPT");
                } catch (Exception e1) {
                    logger.error(e1,e1);
                }
            }
        } catch (RuntimeException rte) {
            try {
                genericViewModel.activateNativeDesktop();
                logger.error("ACTIVATE: EXCEPTION");
                onException(rte);
            } catch (InterruptedException e1) {
                throw new RuntimeException("interrupted onException handling", e1);
            } catch (Exception e) {
                logger.error(e,e);
            } finally {
                try {
                    genericViewModel.deactivateNativeDesktop();
                    logger.error("ACTIVATE: EXCEPTION");
                } catch (Exception e) {
                    logger.error(e,e);
                }
            }
            throw rte;
        } catch (Exception e) {
            logger.error(e,e);
        } finally {
            try {
                genericViewModel.deactivateNativeDesktop();
                logger.error("DEACTIVATE: RUN");
            } catch (Exception e) {
                logger.error(e,e);
            }
        }
    } finally {
        try {
            genericViewModel.activateNativeDesktop();
            logger.error("ACTIVATE: CLEANUP");
            try {
                if(win != null){
                    Clients.clearBusy(win);
                }
            } catch (Exception e) {
                logger.error(e,e);
            }
            onCleanup();
        } catch (InterruptedException e1) {
            throw new RuntimeException("interrupted onCleanup handling", e1);
        } catch (Exception e1) {
            logger.error(e1,e1);
        } finally {
            try {
                genericViewModel.deactivateNativeDesktop();
                logger.error("DEACTIVATE: CLEANUP");
            } catch (Exception e) {
                logger.error(e,e);
            }
        }
    }
}

}

并从genericViewModel激活停用代码：

...... public GenericViewModel（）{nativeDesktop = Executions.getCurrent（）。getDesktop（）; }

......

public GenericViewModel(){
    nativeDesktop = Executions.getCurrent().getDesktop();
}

public boolean activateNativeDesktop() throws Exception{
    boolean res = false;
    if(getNativeDesktop() != null && getNativeDesktop().isAlive()){
        try {
            Executions.activate(getNativeDesktop());
            res = true;
        } catch (Throwable e) {
            logger.error(e,e);
            throw(e);
        }
    }else{
        throw new Exception("ZK native Desktop is null");
    }
    return res;
}

public boolean deactivateNativeDesktop() throws Exception{
    boolean res = false;
    if(getNativeDesktop() != null && getNativeDesktop().isAlive()){
        try {
            Executions.deactivate(getNativeDesktop());
            res = true;
        } catch (Throwable e) {
            logger.error(e,e);
            throw(e);
        }
    }else{
        throw new Exception("ZK native Desktop is null");
    }
    return res;
}

zk LongUIOperation Executions.deactivate空指针异常

0 个答案: