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Turbine is a servlet based framework that allows experienced Java developers to quickly build secure web applications. Parts of Turbine can also be used independently of the web portion of Turbine as well. In other words, we strive to make portions of Turbine easily available for use in other applications.

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package org.apache.turbine.modules;

/*
 * 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.
 */

import org.apache.turbine.Turbine;
import org.apache.turbine.pipeline.PipelineData;

/**
 * The purpose of this class is to allow one to load and execute
 * Action modules.
 *
 * @author Dave Bryson
 * @author Henning P. Schmiedehausen
 * @author Peter Courcoux
 * @version $Id: ActionLoader.java 1854786 2019-03-04 18:29:18Z tv $
 */
public class ActionLoader
    extends GenericLoader
{
    /** The single instance of this class. */
    private static ActionLoader instance = new ActionLoader();

    /**
     * These ctor's are private to force clients to use getInstance()
     * to access this class.
     */
    private ActionLoader()
    {
        super(Action.class,
                () -> Turbine.getConfiguration().getInt(Action.CACHE_SIZE_KEY,
                        Action.CACHE_SIZE_DEFAULT));
    }

    /**
     * Attempts to load and execute the external action.
     *
     * @param pipelineData Turbine information.
     * @param name Name of object that will execute the action.
     * @throws Exception a generic exception.
     */
    @Override
    public void exec(PipelineData pipelineData, String name)
    		throws Exception
    {
        getAssembler(name).perform(pipelineData);
    }

    /**
     * The method through which this class is accessed.
     *
     * @return The single instance of this class.
     */
    public static ActionLoader getInstance()
    {
        return instance;
    }
}