org.openo.commontosca.inventory.core.mongo.DeferredSingleResult.java Source code

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Here is the source code for org.openo.commontosca.inventory.core.mongo.DeferredSingleResult.java

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/**
 * Copyright  2017 ZTE Corporation.
 *
 * 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 org.openo.commontosca.inventory.core.mongo;

import java.util.function.Consumer;

import org.openo.commontosca.inventory.sdk.api.deferred.SimpleDeferredObject;

import com.mongodb.async.SingleResultCallback;

public class DeferredSingleResult<R> extends SimpleDeferredObject<R> implements SingleResultCallback<R> {

    @Override
    public void onResult(R result, Throwable t) {
        if (t != null) {
            this.reject(t);
        } else {
            this.resolve(result);
        }
    }

    /**
     * 
     * @param consumer
     * @return
     * @throws InterruptedException
     * @throws Exception
     */
    public static <R> R execute(Consumer<DeferredSingleResult<R>> consumer) throws InterruptedException, Exception {
        DeferredSingleResult<R> deferred = new DeferredSingleResult<>();
        consumer.accept(deferred);
        return deferred.join();
    }

}