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com.alibaba.rocketmq.common.Configuration Maven / Gradle / Ivy
/**
* 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 com.alibaba.rocketmq.common;
import org.slf4j.Logger;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* @author xigu.lx
*/
public class Configuration {
private final Logger log;
private List configObjectList = new ArrayList(4);
private String storePath;
private boolean storePathFromConfig = false;
private Object storePathObject;
private Field storePathField;
private DataVersion dataVersion = new DataVersion();
private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
/**
* All properties include configs in object and extend properties.
*/
private Properties allConfigs = new Properties();
public Configuration(Logger log) {
this.log = log;
}
public Configuration(Logger log, Object... configObjects) {
this.log = log;
if (configObjects == null || configObjects.length == 0) {
return;
}
for (Object configObject : configObjects) {
registerConfig(configObject);
}
}
public Configuration(Logger log, String storePath, Object... configObjects) {
this(log, configObjects);
this.storePath = storePath;
}
/**
* register config object
*
* @param configObject
* @return
*/
public Configuration registerConfig(Object configObject) {
try {
readWriteLock.writeLock().lockInterruptibly();
try {
Properties registerProps = MixAll.object2Properties(configObject);
merge(registerProps, this.allConfigs);
configObjectList.add(configObject);
} finally {
readWriteLock.writeLock().unlock();
}
} catch (InterruptedException e) {
log.error("registerConfig lock error");
}
return this;
}
/**
* register config properties
*
* @param extProperties
* @return
*/
public Configuration registerConfig(Properties extProperties) {
if (extProperties == null) {
return this;
}
try {
readWriteLock.writeLock().lockInterruptibly();
try {
merge(extProperties, this.allConfigs);
} finally {
readWriteLock.writeLock().unlock();
}
} catch (InterruptedException e) {
log.error("register lock error. {}" + extProperties);
}
return this;
}
/**
* The store path will be gotten from the field of object.
*
* @param object
* @param fieldName
*
* @throws java.lang.RuntimeException if the field of object is not exist.
*/
public void setStorePathFromConfig(Object object, String fieldName) {
assert object != null;
try {
readWriteLock.writeLock().lockInterruptibly();
try {
this.storePathFromConfig = true;
this.storePathObject = object;
// check
this.storePathField = object.getClass().getDeclaredField(fieldName);
assert this.storePathField != null
&& !Modifier.isStatic(this.storePathField.getModifiers());
this.storePathField.setAccessible(true);
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
} finally {
readWriteLock.writeLock().unlock();
}
} catch (InterruptedException e) {
log.error("setStorePathFromConfig lock error");
}
}
private String getStorePath() {
String realStorePath = null;
try {
readWriteLock.readLock().lockInterruptibly();
try {
realStorePath = this.storePath;
if (this.storePathFromConfig) {
try {
realStorePath = (String) storePathField.get(this.storePathObject);
} catch (IllegalAccessException e) {
log.error("getStorePath error, ", e);
}
}
} finally {
readWriteLock.readLock().unlock();
}
} catch (InterruptedException e) {
log.error("getStorePath lock error");
}
return realStorePath;
}
public void update(Properties properties) {
try {
readWriteLock.writeLock().lockInterruptibly();
try {
// the property must be exist when update
mergeIfExist(properties, this.allConfigs);
for (Object configObject : configObjectList) {
// not allConfigs to update...
MixAll.properties2Object(properties, configObject);
}
this.dataVersion.nextVersion();
} finally {
readWriteLock.writeLock().unlock();
}
} catch (InterruptedException e) {
log.error("update lock error, {}", properties);
return;
}
persist();
}
public void persist() {
try {
readWriteLock.readLock().lockInterruptibly();
try {
String allConfigs = getAllConfigsInternal();
MixAll.string2File(allConfigs, getStorePath());
} catch (IOException e) {
log.error("persist string2File error, ", e);
} finally {
readWriteLock.readLock().unlock();
}
} catch (InterruptedException e) {
log.error("persist lock error");
}
}
public String getAllConfigsFormatString() {
try {
readWriteLock.readLock().lockInterruptibly();
try {
return getAllConfigsInternal();
} finally {
readWriteLock.readLock().unlock();
}
} catch (InterruptedException e) {
log.error("getAllConfigsFormatString lock error");
}
return null;
}
public String getDataVersionJson() {
return this.dataVersion.toJson();
}
public Properties getAllConfigs() {
try {
readWriteLock.readLock().lockInterruptibly();
try {
return this.allConfigs;
} finally {
readWriteLock.readLock().unlock();
}
} catch (InterruptedException e) {
log.error("getAllConfigs lock error");
}
return null;
}
private String getAllConfigsInternal() {
StringBuilder stringBuilder = new StringBuilder();
// reload from config object ?
for (Object configObject : this.configObjectList) {
Properties properties = MixAll.object2Properties(configObject);
if (properties != null) {
merge(properties, this.allConfigs);
} else {
log.warn("getAllConfigsInternal object2Properties is null, {}", configObject.getClass());
}
}
{
stringBuilder.append(MixAll.properties2String(this.allConfigs));
}
return stringBuilder.toString();
}
public void setStorePath(final String storePath) {
this.storePath = storePath;
}
private void merge(Properties from, Properties to) {
for (Object key : from.keySet()) {
Object fromObj = from.get(key), toObj = to.get(key);
if (toObj != null && !toObj.equals(fromObj)) {
log.info("Replace, key: {}, value: {} -> {}", key, toObj, fromObj);
}
to.put(key, fromObj);
}
}
private void mergeIfExist(Properties from, Properties to) {
for (Object key : from.keySet()) {
if (!to.containsKey(key)) {
continue;
}
Object fromObj = from.get(key), toObj = to.get(key);
if (toObj != null && !toObj.equals(fromObj)) {
log.info("Replace, key: {}, value: {} -> {}", key, toObj, fromObj);
}
to.put(key, fromObj);
}
}
}
