hadoop ProtobufHelper 源码
haddop ProtobufHelper 代码
文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/ProtobufHelper.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.ipc;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.security.proto.SecurityProtos.TokenProto;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.TokenIdentifier;
import org.apache.hadoop.thirdparty.protobuf.ByteString;
import org.apache.hadoop.thirdparty.protobuf.ServiceException;
/**
* Helper methods for protobuf related RPC implementation
*/
@InterfaceAudience.Private
public class ProtobufHelper {
private ProtobufHelper() {
// Hidden constructor for class with only static helper methods
}
/**
* Return the IOException thrown by the remote server wrapped in
* ServiceException as cause.
* @param se ServiceException that wraps IO exception thrown by the server
* @return Exception wrapped in ServiceException or
* a new IOException that wraps the unexpected ServiceException.
*/
public static IOException getRemoteException(ServiceException se) {
Throwable e = se.getCause();
if (e == null) {
return new IOException(se);
}
return e instanceof IOException ? (IOException) e : new IOException(se);
}
/**
* Kept for backward compatible.
* Return the IOException thrown by the remote server wrapped in
* ServiceException as cause.
* @param se ServiceException that wraps IO exception thrown by the server
* @return Exception wrapped in ServiceException or
* a new IOException that wraps the unexpected ServiceException.
*/
@Deprecated
public static IOException getRemoteException(
com.google.protobuf.ServiceException se) {
Throwable e = se.getCause();
if (e == null) {
return new IOException(se);
}
return e instanceof IOException ? (IOException) e : new IOException(se);
}
/**
* Map used to cache fixed strings to ByteStrings. Since there is no
* automatic expiration policy, only use this for strings from a fixed, small
* set.
* <p/>
* This map should not be accessed directly. Used the getFixedByteString
* methods instead.
*/
private final static ConcurrentHashMap<Object, ByteString>
FIXED_BYTESTRING_CACHE = new ConcurrentHashMap<>();
/**
* Get the ByteString for frequently used fixed and small set strings.
* @param key string
* @return the ByteString for frequently used fixed and small set strings.
*/
public static ByteString getFixedByteString(Text key) {
ByteString value = FIXED_BYTESTRING_CACHE.get(key);
if (value == null) {
value = ByteString.copyFromUtf8(key.toString());
FIXED_BYTESTRING_CACHE.put(new Text(key.copyBytes()), value);
}
return value;
}
/**
* Get the ByteString for frequently used fixed and small set strings.
* @param key string
* @return ByteString for frequently used fixed and small set strings.
*/
public static ByteString getFixedByteString(String key) {
ByteString value = FIXED_BYTESTRING_CACHE.get(key);
if (value == null) {
value = ByteString.copyFromUtf8(key);
FIXED_BYTESTRING_CACHE.put(key, value);
}
return value;
}
public static ByteString getByteString(byte[] bytes) {
// return singleton to reduce object allocation
return (bytes.length == 0) ? ByteString.EMPTY : ByteString.copyFrom(bytes);
}
public static Token<? extends TokenIdentifier> tokenFromProto(
TokenProto tokenProto) {
Token<? extends TokenIdentifier> token = new Token<>(
tokenProto.getIdentifier().toByteArray(),
tokenProto.getPassword().toByteArray(), new Text(tokenProto.getKind()),
new Text(tokenProto.getService()));
return token;
}
public static TokenProto protoFromToken(Token<?> tok) {
TokenProto.Builder builder = TokenProto.newBuilder().
setIdentifier(getByteString(tok.getIdentifier())).
setPassword(getByteString(tok.getPassword())).
setKindBytes(getFixedByteString(tok.getKind())).
setServiceBytes(getFixedByteString(tok.getService()));
return builder.build();
}
}
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