component-dsl/src/main/java/org/apache/aries/component/dsl/internal/EffectsOSGi.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.OSGiResult;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * @author Carlos Sierra Andrés
 */
public class EffectsOSGi extends OSGiImpl<Void> {

    public EffectsOSGi(
        Runnable onAddingBefore, Runnable onAddingAfter,
        Runnable onRemovingBefore, Runnable onRemovingAfter, Runnable onUpdate) {

        super((executionContext, op) -> {
            onAddingBefore.run();

            try {
                OSGiResult terminator = op.publish(null);

                OSGiResult result = new OSGiResultImpl(
                    () -> {
                        try {
                            onRemovingBefore.run();
                        }
                        catch (Exception e) {
                            //TODO: logging
                        }

                        try {
                            terminator.run();
                        }
                        catch (Exception e) {
                            //TODO: logging
                        }

                        try {
                            onRemovingAfter.run();
                        }
                        catch (Exception e) {
                            //TODO: logging
                        }
                    },
                    () -> {
                        AtomicBoolean atomicBoolean = new AtomicBoolean();

                        UpdateSupport.deferPublication(() -> {
                            if (!atomicBoolean.get()) {
                                onUpdate.run();
                            }
                        });

                        atomicBoolean.set(terminator.update());

                        return atomicBoolean.get();
                    }                );

                try {
                    onAddingAfter.run();
                }
                catch (Exception e) {
                    result.run();

                    throw e;
                }

                return result;
            }
            catch (Exception e) {
                try {
                    onRemovingAfter.run();
                }
                catch (Exception e1) {
                    //TODO: logging
                }

                throw e;
            }
        });
    }
}