code: /**
   * This file is part of Eclipse Steady.
   *
   * 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.
   *
   * SPDX-License-Identifier: Apache-2.0
   * SPDX-FileCopyrightText: Copyright (c) 2018-2020 SAP SE or an SAP affiliate company and Eclipse Steady contributors
   */
  package org.eclipse.steady.goals;
  
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Executors;
  
  import org.apache.logging.log4j.Logger;
  
  /**
   * <p>GoalExecutor class.</p>
   */
  public class GoalExecutor {
  
    private static final Logger log =
        org.apache.logging.log4j.LogManager.getLogger(GoalExecutor.class);
  
    private static GoalExecutor instance = null;
  
    /**
     * <p>Getter for the field <code>instance</code>.</p>
     *
     * @return a {@link org.eclipse.steady.goals.GoalExecutor} object.
     */
    public static synchronized GoalExecutor getInstance() {
      if (instance == null) instance = new GoalExecutor();
      return instance;
    }
  
    private ExecutorService pool = null;
  
    private GoalExecutor() {
      this.pool = Executors.newFixedThreadPool(4); // newSingleThreadExecutor();
    }
  
    /**
     * <p>execute.</p>
     *
     * @param _goal a {@link org.eclipse.steady.goals.AbstractGoal} object.
     */
    public void execute(AbstractGoal _goal) {
      this.pool.execute(_goal);
    }
  }
  