code: /*
   * Copyright © 2014-2017 EntIT Software LLC, a Micro Focus company (L.P.)
   *
   * 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 io.cloudslang.worker.execution.model;
  
  import org.apache.commons.lang3.tuple.ImmutablePair;
  import org.apache.commons.lang3.tuple.Pair;
  
  import java.util.concurrent.Callable;
  import java.util.concurrent.atomic.AtomicReference;
  
  
  public class SandboxExecutionRunnable<T> implements Runnable {
  
      private final ClassLoader classLoader;
      private final AtomicReference<Pair<T, RuntimeException>> bundle;
      private final Callable<T> callable;
  
      public SandboxExecutionRunnable(ClassLoader classLoader, Callable<T> callable) {
          this.classLoader = classLoader;
          this.bundle = new AtomicReference<>();
          this.callable = callable;
      }
  
      @Override
      public void run() {
          T processingResult = null;
          RuntimeException processingException = null;
  
          try {
              Thread.currentThread().setContextClassLoader(classLoader);
              processingResult = callable.call();
          } catch (RuntimeException re) {
              processingException = re;
          } catch (Exception exception) {
              processingException = new RuntimeException(exception);
          }
  
          bundle.set(new ImmutablePair<>(processingResult, processingException));
      }
  
      public void afterExecute() {
          final Pair<T, RuntimeException> localBundle = bundle.get();
          if (localBundle.getRight() != null) {
              throw localBundle.getRight();
          }
      }
  }
  