hadoop RemoteResult 源码
haddop RemoteResult 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RemoteResult.java
/**
* 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.server.federation.router;
import java.io.IOException;
/**
* Result from a remote location.
* It includes the exception if there was any error.
* @param <T> Type of the remote location.
* @param <R> Type of the result.
*/
public class RemoteResult<T extends RemoteLocationContext, R> {
/** The remote location. */
private final T loc;
/** The result from the remote location. */
private final R result;
/** If the result is set; used for void types. */
private final boolean resultSet;
/** The exception if we couldn't get the result. */
private final IOException ioe;
public RemoteResult(T location, R r) {
this.loc = location;
this.result = r;
this.resultSet = true;
this.ioe = null;
}
public RemoteResult(T location, IOException e) {
this.loc = location;
this.result = null;
this.resultSet = false;
this.ioe = e;
}
public T getLocation() {
return loc;
}
public boolean hasResult() {
return resultSet;
}
public R getResult() {
return result;
}
public boolean hasException() {
return getException() != null;
}
public IOException getException() {
return ioe;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder()
.append("loc=").append(getLocation());
if (hasResult()) {
sb.append(" result=").append(getResult());
}
if (hasException()) {
sb.append(" exception=").append(getException());
}
return sb.toString();
}
}
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