| /* |
| * Copyright 2014-present Facebook, Inc. |
| * |
| * 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.facebook.buck.util; |
| |
| import com.android.common.annotations.Nullable; |
| |
| import java.io.InterruptedIOException; |
| |
| /** |
| * A wrapper around a {@link Thread} which implements the {@link AutoCloseable} interface to be |
| * used in try-resource blocks and which also supports forwarding exceptions to the managing |
| * thread. |
| */ |
| public abstract class ManagedThread implements AutoCloseable { |
| |
| private final Thread thread; |
| |
| @Nullable |
| private Exception exception; |
| |
| public ManagedThread() { |
| this.thread = new Thread( |
| new Runnable() { |
| @Override |
| @SuppressWarnings("PMD.EmptyCatchBlock") |
| public void run() { |
| try { |
| ManagedThread.this.run(); |
| } catch (InterruptedIOException | InterruptedException e) { |
| } catch (Exception e) { |
| exception = e; |
| } |
| } |
| }); |
| } |
| |
| public void start() { |
| this.thread.start(); |
| } |
| |
| protected abstract void run() throws Exception; |
| |
| @Override |
| public void close() throws Exception { |
| |
| // Wait for the thread to finish. |
| this.thread.join(); |
| |
| // If the thread died with an exception, forward it to the creating thread. |
| if (exception != null) { |
| throw exception; |
| } |
| } |
| |
| } |