org.microbean.bean.Producer Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of microbean-bean Show documentation
Show all versions of microbean-bean Show documentation
microBean™ Bean: Utility classes for implementing beans.
/* -*- mode: Java; c-basic-offset: 2; indent-tabs-mode: nil; coding: utf-8-unix -*-
*
* Copyright © 2023–2024 microBean™.
*
* 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.microbean.bean;
import java.util.SequencedSet;
// Subordinate to Factory (really to Initializer)
// Akin to CDI's Producer.
// Handles instance production and disposal, *including intercepted production*.
// Does NOT handle initialization; see for example https://github.com/search?q=repo%3Aweld%2Fcore+%22.produce%28%29%22+language%3AJava&type=code
// Does NOT handle post-initialization.
// Does NOT handle business method interception.
// Does NOT handle pre-disposal.
// See also: InterceptingProducer
@FunctionalInterface
public interface Producer extends Aggregate {
public default void dispose(final I i, final Request r) {
if (i instanceof AutoCloseable ac) {
try {
ac.close();
} catch (final RuntimeException | Error e) {
throw e;
} catch (final InterruptedException e) {
Thread.currentThread().interrupt();
throw new DestructionException(e.getMessage(), e);
} catch (final Exception e) {
throw new DestructionException(e.getMessage(), e);
}
}
}
public default I produce(final Request r) {
return this.produce(this.assign(r));
}
/**
* Produces a new contextual instance and returns it, possibly (often) making use of the supplied, dependent,
* contextual references.
*
* Implementations of this method must not call {@link #produce(Request)} or an infinite loop may result.
*
* @param assignments a {@link SequencedSet} of {@link Assignment}s this {@link Producer} needs to create the
* contextual instance; must not be {@code null}
*
* @return a new contextual instance, or {@code null}
*
* @exception NullPointerException if {@code dependentContextualReferences} is {@code null}
*/
public I produce(final SequencedSet> assignments);
}