/*
 *  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
 *
 *    https://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 grails.async.services

import groovy.transform.CompileStatic

import grails.async.decorator.PromiseDecorator
import grails.persistence.support.PersistenceContextInterceptorExecutor

/**
 * A {@link PromiseDecorator} that wraps a promise execution in a persistence context (example Hibernate session)
 *
 * @author Graeme Rocher
 * @since 2.3
 */
@CompileStatic
class PersistenceContextPromiseDecorator implements PromiseDecorator {

    PersistenceContextInterceptorExecutor persistenceContextInterceptorExecutor

    PersistenceContextPromiseDecorator(PersistenceContextInterceptorExecutor persistenceContextInterceptorExecutor) {
        this.persistenceContextInterceptorExecutor = persistenceContextInterceptorExecutor
    }

    @Override
    <D> Closure<D> decorate(Closure<D> original) {
        if (persistenceContextInterceptorExecutor != null) {
            return { args ->
                try {
                    persistenceContextInterceptorExecutor.initPersistenceContext()
                    return original.call(args)
                } finally {
                    persistenceContextInterceptorExecutor.destroyPersistenceContext()
                }
            }
        }
        return original
    }
}
