content: /*
   * 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.
   */
  
  package org.apache.bookkeeper.common.util;
  
  import java.util.function.Consumer;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A runnable that catches runtime exceptions.
   */
  @FunctionalInterface
  public interface SafeRunnable extends Runnable {
  
      Logger LOGGER = LoggerFactory.getLogger(SafeRunnable.class);
  
      @Override
      default void run() {
          try {
              safeRun();
          } catch (Throwable t) {
              LOGGER.error("Unexpected throwable caught ", t);
          }
      }
  
      void safeRun();
  
      /**
       * Utility method to use SafeRunnable from lambdas.
       *
       * <p>Eg:
       * <pre>
       * <code>
       * executor.submit(SafeRunnable.safeRun(() -> {
       *    // My not-safe code
       * });
       * </code>
       * </pre>
       */
      static SafeRunnable safeRun(Runnable runnable) {
          return new SafeRunnable() {
              @Override
              public void safeRun() {
                  runnable.run();
              }
          };
      }
  
      /**
       * Utility method to use SafeRunnable from lambdas with
       * a custom exception handler.
       *
       * <p>Eg:
       * <pre>
       * <code>
       * executor.submit(SafeRunnable.safeRun(() -> {
       *    // My not-safe code
       * }, exception -> {
       *    // Handle exception
       * );
       * </code>
       * </pre>
       *
       * @param runnable
       * @param exceptionHandler
       *            handler that will be called when there are any exception
       * @return
       */
      static SafeRunnable safeRun(Runnable runnable, Consumer<Throwable> exceptionHandler) {
          return () -> {
              try {
                  runnable.run();
              } catch (Throwable t) {
                  exceptionHandler.accept(t);
                  throw t;
              }
          };
      }
  }
  