com.alibaba.nacos.client.naming.backups.FailoverReactor Maven / Gradle / Ivy
/*
* Copyright 1999-2018 Alibaba Group Holding Ltd.
*
* Licensed 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.nacos.client.naming.backups;
import com.alibaba.nacos.api.exception.NacosException;
import com.alibaba.nacos.api.naming.pojo.ServiceInfo;
import com.alibaba.nacos.client.naming.cache.ConcurrentDiskUtil;
import com.alibaba.nacos.client.naming.cache.DiskCache;
import com.alibaba.nacos.client.naming.cache.ServiceInfoHolder;
import com.alibaba.nacos.client.naming.utils.CollectionUtils;
import com.alibaba.nacos.client.naming.utils.UtilAndComs;
import com.alibaba.nacos.common.lifecycle.Closeable;
import com.alibaba.nacos.common.utils.JacksonUtils;
import com.alibaba.nacos.common.utils.StringUtils;
import com.alibaba.nacos.common.utils.ThreadUtils;
import java.io.BufferedReader;
import java.io.File;
import java.io.StringReader;
import java.nio.charset.Charset;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.TimerTask;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import static com.alibaba.nacos.client.utils.LogUtils.NAMING_LOGGER;
/**
* Failover reactor.
*
* @author nkorange
*/
public class FailoverReactor implements Closeable {
private final String failoverDir;
private final ServiceInfoHolder serviceInfoHolder;
private final ScheduledExecutorService executorService;
public FailoverReactor(ServiceInfoHolder serviceInfoHolder, String cacheDir) {
this.serviceInfoHolder = serviceInfoHolder;
this.failoverDir = cacheDir + "/failover";
// init executorService
this.executorService = new ScheduledThreadPoolExecutor(1, new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread thread = new Thread(r);
thread.setDaemon(true);
thread.setName("com.alibaba.nacos.naming.failover");
return thread;
}
});
this.init();
}
private Map serviceMap = new ConcurrentHashMap();
private final Map switchParams = new ConcurrentHashMap();
private static final long DAY_PERIOD_MINUTES = 24 * 60;
/**
* Init.
*/
public void init() {
executorService.scheduleWithFixedDelay(new SwitchRefresher(), 0L, 5000L, TimeUnit.MILLISECONDS);
executorService.scheduleWithFixedDelay(new DiskFileWriter(), 30, DAY_PERIOD_MINUTES, TimeUnit.MINUTES);
// backup file on startup if failover directory is empty.
executorService.schedule(new Runnable() {
@Override
public void run() {
try {
File cacheDir = new File(failoverDir);
if (!cacheDir.exists() && !cacheDir.mkdirs()) {
throw new IllegalStateException("failed to create cache dir: " + failoverDir);
}
File[] files = cacheDir.listFiles();
if (files == null || files.length <= 0) {
new DiskFileWriter().run();
}
} catch (Throwable e) {
NAMING_LOGGER.error("[NA] failed to backup file on startup.", e);
}
}
}, 10000L, TimeUnit.MILLISECONDS);
}
/**
* Add day.
*
* @param date start time
* @param num add day number
* @return new date
*/
public Date addDay(Date date, int num) {
Calendar startDT = Calendar.getInstance();
startDT.setTime(date);
startDT.add(Calendar.DAY_OF_MONTH, num);
return startDT.getTime();
}
@Override
public void shutdown() throws NacosException {
String className = this.getClass().getName();
NAMING_LOGGER.info("{} do shutdown begin", className);
ThreadUtils.shutdownThreadPool(executorService, NAMING_LOGGER);
NAMING_LOGGER.info("{} do shutdown stop", className);
}
class SwitchRefresher implements Runnable {
long lastModifiedMillis = 0L;
@Override
public void run() {
try {
File switchFile = new File(failoverDir + UtilAndComs.FAILOVER_SWITCH);
if (!switchFile.exists()) {
switchParams.put("failover-mode", "false");
NAMING_LOGGER.debug("failover switch is not found, " + switchFile.getName());
return;
}
long modified = switchFile.lastModified();
if (lastModifiedMillis < modified) {
lastModifiedMillis = modified;
String failover = ConcurrentDiskUtil.getFileContent(failoverDir + UtilAndComs.FAILOVER_SWITCH,
Charset.defaultCharset().toString());
if (!StringUtils.isEmpty(failover)) {
String[] lines = failover.split(DiskCache.getLineSeparator());
for (String line : lines) {
String line1 = line.trim();
if ("1".equals(line1)) {
switchParams.put("failover-mode", "true");
NAMING_LOGGER.info("failover-mode is on");
new FailoverFileReader().run();
} else if ("0".equals(line1)) {
switchParams.put("failover-mode", "false");
NAMING_LOGGER.info("failover-mode is off");
}
}
} else {
switchParams.put("failover-mode", "false");
}
}
} catch (Throwable e) {
NAMING_LOGGER.error("[NA] failed to read failover switch.", e);
}
}
}
class FailoverFileReader implements Runnable {
@Override
public void run() {
Map domMap = new HashMap(16);
BufferedReader reader = null;
try {
File cacheDir = new File(failoverDir);
if (!cacheDir.exists() && !cacheDir.mkdirs()) {
throw new IllegalStateException("failed to create cache dir: " + failoverDir);
}
File[] files = cacheDir.listFiles();
if (files == null) {
return;
}
for (File file : files) {
if (!file.isFile()) {
continue;
}
if (file.getName().equals(UtilAndComs.FAILOVER_SWITCH)) {
continue;
}
ServiceInfo dom = new ServiceInfo(file.getName());
try {
String dataString = ConcurrentDiskUtil
.getFileContent(file, Charset.defaultCharset().toString());
reader = new BufferedReader(new StringReader(dataString));
String json;
if ((json = reader.readLine()) != null) {
try {
dom = JacksonUtils.toObj(json, ServiceInfo.class);
} catch (Exception e) {
NAMING_LOGGER.error("[NA] error while parsing cached dom : " + json, e);
}
}
} catch (Exception e) {
NAMING_LOGGER.error("[NA] failed to read cache for dom: " + file.getName(), e);
} finally {
try {
if (reader != null) {
reader.close();
}
} catch (Exception e) {
//ignore
}
}
if (!CollectionUtils.isEmpty(dom.getHosts())) {
domMap.put(dom.getKey(), dom);
}
}
} catch (Exception e) {
NAMING_LOGGER.error("[NA] failed to read cache file", e);
}
if (domMap.size() > 0) {
serviceMap = domMap;
}
}
}
class DiskFileWriter extends TimerTask {
@Override
public void run() {
Map map = serviceInfoHolder.getServiceInfoMap();
for (Map.Entry entry : map.entrySet()) {
ServiceInfo serviceInfo = entry.getValue();
if (StringUtils.equals(serviceInfo.getKey(), UtilAndComs.ALL_IPS) || StringUtils
.equals(serviceInfo.getName(), UtilAndComs.ENV_LIST_KEY) || StringUtils
.equals(serviceInfo.getName(), "00-00---000-ENV_CONFIGS-000---00-00") || StringUtils
.equals(serviceInfo.getName(), "vipclient.properties") || StringUtils
.equals(serviceInfo.getName(), "00-00---000-ALL_HOSTS-000---00-00")) {
continue;
}
DiskCache.write(serviceInfo, failoverDir);
}
}
}
public boolean isFailoverSwitch() {
return Boolean.parseBoolean(switchParams.get("failover-mode"));
}
public ServiceInfo getService(String key) {
ServiceInfo serviceInfo = serviceMap.get(key);
if (serviceInfo == null) {
serviceInfo = new ServiceInfo();
serviceInfo.setName(key);
}
return serviceInfo;
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy