guava-gwt/src-super/com/google/common/util/concurrent/super/com/google/common/util/concurrent/InterruptibleTask.java

/*
 * Copyright (C) 2015 The Guava Authors
 *
 * 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 com.google.common.util.concurrent;

/** Emulation for InterruptibleTask in GWT. */
abstract class InterruptibleTask<V> implements Runnable {

  @Override
  public void run() {
    V result = null;
    Throwable error = null;
    if (isDone()) {
      return;
    }
    try {
      result = runInterruptibly();
    } catch (Throwable t) {
      error = t;
    }
    afterRanInterruptibly(result, error);
  }

  abstract boolean isDone();

  abstract V runInterruptibly() throws Exception;

  abstract void afterRanInterruptibly(V result, Throwable error);

  final void interruptTask() {}

  abstract String toPendingString();
}