org.gwt.dynamic.host.client.features.BusyFeatureProvider.java Source code

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Here is the source code for org.gwt.dynamic.host.client.features.BusyFeatureProvider.java

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/*
 * Copyright 2014 Maxim Dominichenko
 * 
 * Licensed under The MIT License (MIT) (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * https://github.com/domax/gwt-dynamic-plugins/blob/master/LICENSE
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.gwt.dynamic.host.client.features;

import java.util.logging.Logger;

import org.gwt.dynamic.common.client.features.FeatureCommonConst;
import org.gwt.dynamic.common.client.features.FeatureProvider;
import org.gwt.dynamic.common.client.services.BusyEvent;
import org.gwt.dynamic.common.client.services.BusyEvent.BusyHandler;
import org.gwt.dynamic.common.client.services.BusyEvent.HasBusyHandlers;

import com.google.gwt.event.shared.GwtEvent;
import com.google.gwt.event.shared.HandlerManager;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.rpc.AsyncCallback;

public class BusyFeatureProvider extends FeatureProvider<String, Void>
        implements FeatureCommonConst, HasBusyHandlers {

    private static final Logger LOG = Logger.getLogger(BusyFeatureProvider.class.getName());

    private final HandlerManager handlerManager;
    private int count;

    public BusyFeatureProvider() {
        super(MODULE_HOST);
        handlerManager = new HandlerManager(this);
        LOG.info("BusyFeatureProvider: instantiated");
    }

    @Override
    public String getType() {
        return FEATURE_BUSY;
    }

    @Override
    public void call(String busy, AsyncCallback<Void> callback) {
        LOG.info("BusyFeatureProvider.call: busy=" + busy + "; count=" + count);
        setBusy(Boolean.parseBoolean(busy));
    }

    private void setBusy(boolean busy) {
        if (busy) {
            if (count++ > 0)
                return;
        } else {
            if (--count > 0)
                return;
        }
        fireEvent(new BusyEvent(busy));
    }

    //   public boolean isBusy() {
    //      return count > 0;
    //   }
    //   
    @Override
    public void fireEvent(GwtEvent<?> event) {
        handlerManager.fireEvent(event);
    }

    @Override
    public HandlerRegistration addBusyHandler(BusyHandler handler) {
        return handlerManager.addHandler(BusyEvent.getType(), handler);
    }
}