hadoop ResponseInfo 源码
haddop ResponseInfo 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/ResponseInfo.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.yarn.webapp;
import com.google.inject.servlet.RequestScoped;
import java.util.Iterator;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.util.Lists;
/**
* A class to help passing around request scoped info
*/
@InterfaceAudience.LimitedPrivate({"YARN", "MapReduce"})
@RequestScoped
public class ResponseInfo implements Iterable<ResponseInfo.Item> {
public static class Item {
public final String key;
public final String url;
public final Object value;
public final boolean isRaw;
Item(String key, String url, Object value, boolean isRaw) {
this.key = key;
this.url = url;
this.value = value;
this.isRaw = isRaw;
}
public static Item of(String key, Object value, boolean isRaw) {
return new Item(key, null, value, isRaw);
}
public static Item of(String key, String url, Object value) {
return new Item(key, url, value, false);
}
}
final List<Item> items = Lists.newArrayList();
String about = "Info";
// Do NOT add any constructors here, unless...
public static ResponseInfo $about(String about) {
ResponseInfo info = new ResponseInfo();
info.about = about;
return info;
}
public ResponseInfo about(String about) {
this.about = about;
return this;
}
public String about() {
return about;
}
public ResponseInfo __(String key, Object value) {
items.add(Item.of(key, value, false));
return this;
}
public ResponseInfo __(String key, String url, Object anchor) {
if (url == null) {
items.add(Item.of(key, anchor, false));
} else {
items.add(Item.of(key, url, anchor));
}
return this;
}
//Value is raw HTML and shouldn't be escaped
public ResponseInfo _r(String key, Object value) {
items.add(Item.of(key, value, true));
return this;
}
public void clear() {
items.clear();
}
@Override
public Iterator<Item> iterator() {
return items.iterator();
}
}
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