| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.hadoop.hdfs; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| |
| import java.io.IOException; |
| import java.nio.channels.ClosedChannelException; |
| |
| /** |
| * The exception last seen by the {@link DataStreamer} or |
| * {@link DFSOutputStream}. |
| */ |
| @InterfaceAudience.Private |
| class ExceptionLastSeen { |
| private IOException thrown; |
| |
| /** Get the last seen exception. */ |
| synchronized protected IOException get() { |
| return thrown; |
| } |
| |
| /** |
| * Set the last seen exception. |
| * @param t the exception. |
| */ |
| synchronized void set(Throwable t) { |
| assert t != null; |
| this.thrown = t instanceof IOException ? |
| (IOException) t : new IOException(t); |
| } |
| |
| /** Clear the last seen exception. */ |
| synchronized void clear() { |
| thrown = null; |
| } |
| |
| /** |
| * Check if there already is an exception. Throw the exception if exist. |
| * |
| * @param resetToNull set to true to reset exception to null after calling |
| * this function. |
| * @throws IOException on existing IOException. |
| */ |
| synchronized void check(boolean resetToNull) throws IOException { |
| if (thrown != null) { |
| final IOException e = thrown; |
| if (resetToNull) { |
| thrown = null; |
| } |
| throw e; |
| } |
| } |
| |
| synchronized void throwException4Close() throws IOException { |
| check(false); |
| throw new ClosedChannelException(); |
| } |
| } |