co.cask.cdap.common.conf.InMemoryPropertyStore.java Source code

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Here is the source code for co.cask.cdap.common.conf.InMemoryPropertyStore.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 co.cask.cdap.common.conf;

import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;

/**
 * An in memory implementation of {@link PropertyStore}.
 *
 * @param <T> Type of property
 */
public final class InMemoryPropertyStore<T> extends AbstractPropertyStore<T> {

    @Override
    protected boolean listenerAdded(String name) {
        return true;
    }

    @Override
    public synchronized ListenableFuture<T> update(String name, PropertyUpdater<T> updater) {
        try {
            T property = updater.apply(getCached(name)).get();
            updateAndNotify(name, property);
            return Futures.immediateFuture(property);
        } catch (Exception e) {
            return Futures.immediateFailedFuture(e);
        }
    }

    @Override
    public synchronized ListenableFuture<T> set(String name, T property) {
        updateAndNotify(name, property);
        return Futures.immediateFuture(property);
    }
}