| /** |
| * 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.store.driver.impl; |
| |
| import java.io.IOException; |
| |
| import org.apache.commons.codec.binary.Base64; |
| import org.apache.commons.codec.binary.StringUtils; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.hdfs.server.federation.store.driver.StateStoreSerializer; |
| import org.apache.hadoop.hdfs.server.federation.store.records.BaseRecord; |
| import org.apache.hadoop.hdfs.server.federation.store.records.impl.pb.PBRecord; |
| import org.apache.hadoop.util.ReflectionUtils; |
| |
| import com.google.protobuf.Message; |
| |
| /** |
| * Protobuf implementation of the State Store serializer. |
| */ |
| public final class StateStoreSerializerPBImpl extends StateStoreSerializer { |
| |
| private static final String PB_IMPL_PACKAGE_SUFFIX = "impl.pb"; |
| private static final String PB_IMPL_CLASS_SUFFIX = "PBImpl"; |
| |
| private Configuration localConf = new Configuration(); |
| |
| |
| private StateStoreSerializerPBImpl() { |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public <T> T newRecordInstance(Class<T> clazz) { |
| try { |
| String clazzPBImpl = getPBImplClassName(clazz); |
| Class<?> pbClazz = localConf.getClassByName(clazzPBImpl); |
| Object retObject = ReflectionUtils.newInstance(pbClazz, localConf); |
| return (T)retObject; |
| } catch (ClassNotFoundException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| private String getPBImplClassName(Class<?> clazz) { |
| String srcPackagePart = getPackageName(clazz); |
| String srcClassName = getClassName(clazz); |
| String destPackagePart = srcPackagePart + "." + PB_IMPL_PACKAGE_SUFFIX; |
| String destClassPart = srcClassName + PB_IMPL_CLASS_SUFFIX; |
| return destPackagePart + "." + destClassPart; |
| } |
| |
| private String getClassName(Class<?> clazz) { |
| String fqName = clazz.getName(); |
| return (fqName.substring(fqName.lastIndexOf(".") + 1, fqName.length())); |
| } |
| |
| private String getPackageName(Class<?> clazz) { |
| return clazz.getPackage().getName(); |
| } |
| |
| @Override |
| public byte[] serialize(BaseRecord record) { |
| byte[] byteArray64 = null; |
| if (record instanceof PBRecord) { |
| PBRecord recordPB = (PBRecord) record; |
| Message msg = recordPB.getProto(); |
| byte[] byteArray = msg.toByteArray(); |
| byteArray64 = Base64.encodeBase64(byteArray, false); |
| } |
| return byteArray64; |
| } |
| |
| @Override |
| public String serializeString(BaseRecord record) { |
| byte[] byteArray64 = serialize(record); |
| String base64Encoded = StringUtils.newStringUtf8(byteArray64); |
| return base64Encoded; |
| } |
| |
| @Override |
| public <T extends BaseRecord> T deserialize( |
| byte[] byteArray, Class<T> clazz) throws IOException { |
| |
| T record = newRecord(clazz); |
| if (record instanceof PBRecord) { |
| PBRecord pbRecord = (PBRecord) record; |
| byte[] byteArray64 = Base64.encodeBase64(byteArray, false); |
| String base64Encoded = StringUtils.newStringUtf8(byteArray64); |
| pbRecord.readInstance(base64Encoded); |
| } |
| return record; |
| } |
| |
| @Override |
| public <T extends BaseRecord> T deserialize(String data, Class<T> clazz) |
| throws IOException { |
| byte[] byteArray64 = Base64.decodeBase64(data); |
| return deserialize(byteArray64, clazz); |
| } |
| } |