| // 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.devtools.build.lib.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(); |
| } |