LongOperation.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2015 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.zkoss.util;
 
import org.turro.string.Strings;
import org.turro.command.Command;
import org.turro.command.Context;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.EventListener;
import org.zkoss.zk.ui.event.Events;
import org.zkoss.zk.ui.util.Clients;
 
public class LongOperation {
  
  private static final String LONG_OPERATION_EVENT = "onLongOperation";
  
  public static void executeLongOperation(Component component, final Command command) {
    executeLongOperation(component, null, command);
  }
  
  public static void executeLongOperation(final Component component, final String busyMsg, final Command command) {
    if(!Strings.isBlank(busyMsg)) {
      Clients.showBusy(busyMsg);
    }
    component.addEventListener(LONG_OPERATION_EVENT, new EventListener<Event>() {
      @Override
      public void onEvent(Event event) throws Exception {
        Context ctx = new Context();
        command.execute(ctx);
        if(!Strings.isBlank(busyMsg)) {
          Clients.clearBusy();
        }
        component.removeEventListener(LONG_OPERATION_EVENT, this);
      }
    });
    Events.echoEvent(LONG_OPERATION_EVENT, component, null);
  }
 
}