eu.stratosphere.nephele.ipc.RemoteException Maven / Gradle / Ivy
/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* 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.
**********************************************************************************************************************/
/**
* This file is based on source code from the Hadoop Project (http://hadoop.apache.org/), licensed by the Apache
* Software Foundation (ASF) under the Apache License, Version 2.0. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package eu.stratosphere.nephele.ipc;
import java.io.IOException;
import java.lang.reflect.Constructor;
public class RemoteException extends IOException {
/** For java.io.Serializable */
private static final long serialVersionUID = 1L;
private String className;
public RemoteException(String className, String msg) {
super(msg);
this.className = className;
}
public String getClassName() {
return className;
}
/**
* If this remote exception wraps up one of the lookupTypes
* then return this exception.
*
* Unwraps any IOException.
*
* @param lookupTypes
* the desired exception class.
* @return IOException, which is either the lookupClass exception or this.
*/
public IOException unwrapRemoteException(Class... lookupTypes) {
if (lookupTypes == null) {
return this;
}
for (Class lookupClass : lookupTypes) {
if (!lookupClass.getName().equals(getClassName())) {
continue;
}
try {
return instantiateException(lookupClass.asSubclass(IOException.class));
} catch (Exception e) {
// cannot instantiate lookupClass, just return this
return this;
}
}
// wrapped up exception is not in lookupTypes, just return this
return this;
}
/**
* Instantiate and return the exception wrapped up by this remote exception.
*
* This unwraps any Throwable that has a constructor taking a String as a parameter.
* Otherwise it returns this.
*
* @return Throwable
*/
public IOException unwrapRemoteException() {
try {
Class realClass = Class.forName(getClassName());
return instantiateException(realClass.asSubclass(IOException.class));
} catch (Exception e) {
// cannot instantiate the original exception, just return this
}
return this;
}
private IOException instantiateException(Class cls) throws Exception {
Constructor cn = cls.getConstructor(String.class);
cn.setAccessible(true);
String firstLine = this.getMessage();
int eol = firstLine.indexOf('\n');
if (eol >= 0) {
firstLine = firstLine.substring(0, eol);
}
IOException ex = cn.newInstance(firstLine);
ex.initCause(this);
return ex;
}
}