SappUpdatePendingRequests.java

/**
 * Copyright (c) 2010-2016 by the respective copyright holders.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.openhab.binding.sapp.internal;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.openhab.binding.sapp.SappUpdatePendingRequestsProvider;

/**
 * Storage for items changed in configuration, to be reloaded. Synchronized access
 *
 * @author Paolo Denti
 * @since 1.8.0
 */
public class SappUpdatePendingRequests implements SappUpdatePendingRequestsProvider {

    private Set<String> pendingUpdateRequests = Collections.synchronizedSet(new HashSet<String>());

    @Override
    public void addPendingUpdateRequest(String itemName) {
        pendingUpdateRequests.add(itemName);
    }

    @Override
    public void replaceAllPendingUpdateRequests(String itemName) {
        synchronized (pendingUpdateRequests) {
            pendingUpdateRequests.clear();
            pendingUpdateRequests.add(itemName);
        }
    }

    @Override
    public Set<String> getAndClearPendingUpdateRequests() {
        Set<String> toBeReturned = new HashSet<String>();
        synchronized (pendingUpdateRequests) {
            toBeReturned.addAll(pendingUpdateRequests);
            pendingUpdateRequests.clear();
        }

        return toBeReturned;
    }

    @Override
    public boolean areUpdatePendingRequestsPresent() {
        return pendingUpdateRequests.size() > 0;
    }
}