hadoop GenericRefreshProtocolClientSideTranslatorPB 源码
haddop GenericRefreshProtocolClientSideTranslatorPB 代码
文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/protocolPB/GenericRefreshProtocolClientSideTranslatorPB.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.protocolPB;
import java.io.Closeable;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import org.apache.hadoop.ipc.ProtobufHelper;
import org.apache.hadoop.ipc.ProtocolMetaInterface;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.ipc.RefreshResponse;
import org.apache.hadoop.ipc.RpcClientUtil;
import org.apache.hadoop.ipc.GenericRefreshProtocol;
import org.apache.hadoop.ipc.proto.GenericRefreshProtocolProtos.GenericRefreshRequestProto;
import org.apache.hadoop.ipc.proto.GenericRefreshProtocolProtos.GenericRefreshResponseProto;
import org.apache.hadoop.ipc.proto.GenericRefreshProtocolProtos.GenericRefreshResponseCollectionProto;
import org.apache.hadoop.thirdparty.protobuf.RpcController;
import org.apache.hadoop.thirdparty.protobuf.ServiceException;
public class GenericRefreshProtocolClientSideTranslatorPB implements
ProtocolMetaInterface, GenericRefreshProtocol, Closeable {
/** RpcController is not used and hence is set to null. */
private final static RpcController NULL_CONTROLLER = null;
private final GenericRefreshProtocolPB rpcProxy;
public GenericRefreshProtocolClientSideTranslatorPB(
GenericRefreshProtocolPB rpcProxy) {
this.rpcProxy = rpcProxy;
}
@Override
public void close() throws IOException {
RPC.stopProxy(rpcProxy);
}
@Override
public Collection<RefreshResponse> refresh(String identifier, String[] args) throws IOException {
List<String> argList = Arrays.asList(args);
try {
GenericRefreshRequestProto request = GenericRefreshRequestProto.newBuilder()
.setIdentifier(identifier)
.addAllArgs(argList)
.build();
GenericRefreshResponseCollectionProto resp = rpcProxy.refresh(NULL_CONTROLLER, request);
return unpack(resp);
} catch (ServiceException se) {
throw ProtobufHelper.getRemoteException(se);
}
}
private Collection<RefreshResponse> unpack(GenericRefreshResponseCollectionProto collection) {
List<GenericRefreshResponseProto> responseProtos = collection.getResponsesList();
List<RefreshResponse> responses = new ArrayList<RefreshResponse>();
for (GenericRefreshResponseProto rp : responseProtos) {
RefreshResponse response = unpack(rp);
responses.add(response);
}
return responses;
}
private RefreshResponse unpack(GenericRefreshResponseProto proto) {
// The default values
String message = null;
String sender = null;
int returnCode = -1;
// ... that can be overridden by data from the protobuf
if (proto.hasUserMessage()) {
message = proto.getUserMessage();
}
if (proto.hasExitStatus()) {
returnCode = proto.getExitStatus();
}
if (proto.hasSenderName()) {
sender = proto.getSenderName();
}
// ... and put into a RefreshResponse
RefreshResponse response = new RefreshResponse(returnCode, message);
response.setSenderName(sender);
return response;
}
@Override
public boolean isMethodSupported(String methodName) throws IOException {
return RpcClientUtil.isMethodSupported(rpcProxy,
GenericRefreshProtocolPB.class,
RPC.RpcKind.RPC_PROTOCOL_BUFFER,
RPC.getProtocolVersion(GenericRefreshProtocolPB.class),
methodName);
}
}
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