component-dsl/src/main/java/org/apache/aries/component/dsl/internal/AllOSGi.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.aries.component.dsl.internal;

import org.apache.aries.component.dsl.OSGi;
import org.apache.aries.component.dsl.OSGiResult;

import java.util.ArrayList;
import java.util.ListIterator;

/**
 * @author Carlos Sierra Andrés
 */
public class AllOSGi<T> extends OSGiImpl<T> {

    @SafeVarargs
    public AllOSGi(OSGi<T>... programs) {
        super((bundleContext, op) -> {
            ArrayList<OSGiResult> results = new ArrayList<>(programs.length);

            try {
                for (OSGi<T> program : programs) {
                    results.add(program.run(bundleContext, op));
                }
            }
            catch (Exception e) {
                cleanUp(results);

                throw e;
            }

            return new OSGiResultImpl(
                () -> cleanUp(results)
            );
        });
    }

    private static void cleanUp(ArrayList<OSGiResult> results) {
        ListIterator<OSGiResult> iterator =
            results.listIterator(results.size());

        while (iterator.hasPrevious()) {
            try {
                iterator.previous().close();
            }
            catch (Exception ex) {
            }
        }
    }
}