core/src/main/java/io/grpc/internal/LogExceptionRunnable.java

/*
 * Copyright 2016, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *    * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */

package io.grpc.internal;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.base.Throwables;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * A simple wrapper for a {@link Runnable} that logs any exception thrown by it, before
 * re-throwing it.
 */
public final class LogExceptionRunnable implements Runnable {

  private static final Logger log = Logger.getLogger(LogExceptionRunnable.class.getName());

  private final Runnable task;

  public LogExceptionRunnable(Runnable task) {
    this.task = checkNotNull(task, "task");
  }

  @Override
  public void run() {
    try {
      task.run();
    } catch (Throwable t) {
      log.log(Level.SEVERE, "Exception while executing runnable " + task, t);
      Throwables.throwIfUnchecked(t);
      throw new AssertionError(t);
    }
  }

  @Override
  public String toString() {
    return "LogExceptionRunnable(" + task + ")";
  }
}