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/*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.api.deployment;
/**
* MetaData associated with a Deployer. This is used by the deployment layers to identify the special requirements of
* the Deployer.
*
* Supported Requirements : invalidatesClassLoader Deployer can load classes that need to be reloaded for the
* application to run successfully hence requiring the class loader to be flushed and reinitialized between the prepare
* and load phase. componentAPIs Components can use APIs that are defined outside of the component's bundle. These
* component's APIs (eg. Jakarta EE APIs) must be imported by the application class loader before any application code is
* loaded.
*/
public class MetaData {
private static final Class[] empty = new Class[0];
private final boolean invalidatesCL;
private final Class[] requires;
private final Class[] provides;
/**
* Constructor for the Deployer's metadata
*
* @param invalidatesClassLoader If true, invalidates the class loader used during the deployment's prepare phase
*/
public MetaData(boolean invalidatesClassLoader, Class[] provides, Class[] requires) {
this.invalidatesCL = invalidatesClassLoader;
this.provides = provides;
this.requires = requires;
}
/**
* Returns whether or not the class loader is invalidated by the Deployer's propare phase.
*
* @return true if the class loader is invalid after the Deployer's prepare phase call.
*/
public boolean invalidatesClassLoader() {
return invalidatesCL;
}
/**
* Returns the list of types of metadata this deployer will provide to the deployement context upon the successful
* completion of the prepare method.
*
* @return list of metadata type;
*/
public Class[] provides() {
if (provides == null) {
return empty;
}
return provides;
}
/**
* Returns the list of types of metadata this deployer will require to run successfully the prepare method.
*
* @return list of metadata required type;
*/
public Class[] requires() {
if (requires == null) {
return empty;
}
return requires;
}
}