content: // Copyright 2014 The Bazel Authors. All rights reserved.
  //
  // 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.android.apps.common.testing.broker.shell;
  
  /**
   * Supplier of the command result which additionally allows to check if
   * the command already terminated. Implementing full fledged Future would
   * be a much harder undertaking, so a bare minimum that makes this class still
   * useful for asynchronous command execution is implemented.
   */
  public interface FutureCommandResult {
    /**
     * Returns the result of command execution. If the process is not finished
     * yet (as reported by {@link #isDone()}, the call will block until that
     * process terminates.
     *
     * @return non-null result of command execution
     * @throws AbnormalTerminationException if command execution failed
     */
    CommandResult get() throws AbnormalTerminationException;
  
    /**
     * Returns true if the process terminated, the command result is available
     * and the call to {@link #get()} will not block.
     *
     * @return true if the process terminated
     */
    boolean isDone();
  }
  