nacos中notifyConfigInfo有什么用，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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nacos-1.1.3/config/src/main/java/com/alibaba/nacos/config/server/controller/CommunicationController.java
@Controller
@RequestMapping(Constants.COMMUNICATION_CONTROLLER_PATH)
public class CommunicationController {
private final DumpService dumpService;
private final LongPollingService longPollingService;
private String trueStr = "true";
@Autowired
public CommunicationController(DumpService dumpService, LongPollingService longPollingService) {
this.dumpService = dumpService;
this.longPollingService = longPollingService;
}
/**
* 通知配置信息改变
*/
@RequestMapping(value = "/dataChange", method = RequestMethod.GET)
@ResponseBody
public Boolean notifyConfigInfo(HttpServletRequest request, HttpServletResponse response,
@RequestParam("dataId") String dataId, @RequestParam("group") String group,
@RequestParam(value = "tenant", required = false, defaultValue = StringUtils.EMPTY)
String tenant,
@RequestParam(value = "tag", required = false) String tag) {
dataId = dataId.trim();
group = group.trim();
String lastModified = request.getHeader(NotifyService.NOTIFY_HEADER_LAST_MODIFIED);
long lastModifiedTs = StringUtils.isEmpty(lastModified) ? -1 : Long.parseLong(lastModified);
String handleIp = request.getHeader(NotifyService.NOTIFY_HEADER_OP_HANDLE_IP);
String isBetaStr = request.getHeader("isBeta");
if (StringUtils.isNotBlank(isBetaStr) && trueStr.equals(isBetaStr)) {
dumpService.dump(dataId, group, tenant, lastModifiedTs, handleIp, true);
} else {
dumpService.dump(dataId, group, tenant, tag, lastModifiedTs, handleIp);
}
return true;
}
//......
}notifyConfigInfo方法主要是执行dumpService.dump方法，只是是否beta调用的dump方法不同
nacos-1.1.3/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpService.java
@Service
public class DumpService {
@Autowired
private Environment env;
@Autowired
PersistService persistService;
@PostConstruct
public void init() {
LogUtil.defaultLog.warn("DumpService start");
DumpProcessor processor = new DumpProcessor(this);
DumpAllProcessor dumpAllProcessor = new DumpAllProcessor(this);
DumpAllBetaProcessor dumpAllBetaProcessor = new DumpAllBetaProcessor(this);
DumpAllTagProcessor dumpAllTagProcessor = new DumpAllTagProcessor(this);
dumpTaskMgr = new TaskManager(
"com.alibaba.nacos.server.DumpTaskManager");
dumpTaskMgr.setDefaultTaskProcessor(processor);
dumpAllTaskMgr = new TaskManager(
"com.alibaba.nacos.server.DumpAllTaskManager");
dumpAllTaskMgr.setDefaultTaskProcessor(dumpAllProcessor);
//......
}
/**
* 全量dump间隔
*/
static final int DUMP_ALL_INTERVAL_IN_MINUTE = 6 * 60;
/**
* 全量dump间隔
*/
static final int INITIAL_DELAY_IN_MINUTE = 6 * 60;
private TaskManager dumpTaskMgr;
private TaskManager dumpAllTaskMgr;
private static final Logger log = LoggerFactory.getLogger(DumpService.class);
static final AtomicInteger FINISHED = new AtomicInteger();
static final int INIT_THREAD_COUNT = 10;
int total = 0;
private final static String TRUE_STR = "true";
private final static String BETA_TABLE_NAME = "config_info_beta";
private final static String TAG_TABLE_NAME = "config_info_tag";
Boolean isQuickStart = false;
private int retentionDays = 30;
//......
public void dump(String dataId, String group, String tenant, long lastModified, String handleIp, boolean isBeta) {
String groupKey = GroupKey2.getKey(dataId, group, tenant);
dumpTaskMgr.addTask(groupKey, new DumpTask(groupKey, lastModified, handleIp, isBeta));
}
public void dump(String dataId, String group, String tenant, String tag, long lastModified, String handleIp) {
dump(dataId, group, tenant, tag, lastModified, handleIp, false);
}
public void dump(String dataId, String group, String tenant, String tag, long lastModified, String handleIp,
boolean isBeta) {
String groupKey = GroupKey2.getKey(dataId, group, tenant);
dumpTaskMgr.addTask(groupKey, new DumpTask(groupKey, tag, lastModified, handleIp, isBeta));
}
//......
}dump方法最后是往dumpTaskMgr添加DumpTask；dumpTaskMgr的defaultTaskProcessor为dumpProcessor
nacos-1.1.3/config/src/main/java/com/alibaba/nacos/config/server/manager/TaskManager.java
public final class TaskManager implements TaskManagerMBean {
private static final Logger log = LogUtil.defaultLog;
private final ConcurrentHashMap tasks = new ConcurrentHashMap();
private final ConcurrentHashMap taskProcessors =
new ConcurrentHashMap();
private TaskProcessor defaultTaskProcessor;
Thread processingThread;
private final AtomicBoolean closed = new AtomicBoolean(true);
private String name;
class ProcessRunnable implements Runnable {
@Override
public void run() {
while (!TaskManager.this.closed.get()) {
try {
Thread.sleep(100);
TaskManager.this.process();
} catch (Throwable e) {
}
}
}
}
ReentrantLock lock = new ReentrantLock();
Condition notEmpty = this.lock.newCondition();
public TaskManager() {
this(null);
}
public AbstractTask getTask(String type) {
return this.tasks.get(type);
}
public TaskProcessor getTaskProcessor(String type) {
return this.taskProcessors.get(type);
}
@SuppressWarnings("PMD.AvoidManuallyCreateThreadRule")
public TaskManager(String name) {
this.name = name;
if (null != name && name.length() > 0) {
this.processingThread = new Thread(new ProcessRunnable(), name);
} else {
this.processingThread = new Thread(new ProcessRunnable());
}
this.processingThread.setDaemon(true);
this.closed.set(false);
this.processingThread.start();
}
//......
/**
* 将任务加入到任务Map中
*
* @param type
* @param task
*/
public void addTask(String type, AbstractTask task) {
this.lock.lock();
try {
AbstractTask oldTask = tasks.put(type, task);
MetricsMonitor.getDumpTaskMonitor().set(tasks.size());
if (null != oldTask) {
task.merge(oldTask);
}
} finally {
this.lock.unlock();
}
}
protected void process() {
for (Map.Entry entry : this.tasks.entrySet()) {
AbstractTask task = null;
this.lock.lock();
try {
// 获取任务
task = entry.getValue();
if (null != task) {
if (!task.shouldProcess()) {
// 任务当前不需要被执行，直接跳过
continue;
}
// 先将任务从任务Map中删除
this.tasks.remove(entry.getKey());
MetricsMonitor.getDumpTaskMonitor().set(tasks.size());
}
} finally {
this.lock.unlock();
}
if (null != task) {
// 获取任务处理器
TaskProcessor processor = this.taskProcessors.get(entry.getKey());
if (null == processor) {
// 如果没有根据任务类型设置的处理器，使用默认处理器
processor = this.getDefaultTaskProcessor();
}
if (null != processor) {
boolean result = false;
try {
// 处理任务
result = processor.process(entry.getKey(), task);
} catch (Throwable t) {
log.error("task_fail", "处理task失败", t);
}
if (!result) {
// 任务处理失败，设置最后处理时间
task.setLastProcessTime(System.currentTimeMillis());
// 将任务重新加入到任务Map中
this.addTask(entry.getKey(), task);
}
}
}
}
if (tasks.isEmpty()) {
this.lock.lock();
try {
this.notEmpty.signalAll();
} finally {
this.lock.unlock();
}
}
}
//......
} TaskManager的addTask方法往tasks添加AbstractTask；其构造器启动了ProcessRunnable，其run方法主要是执行TaskManager.this.process()方法；该方法会遍历tasks，取出任务，然后通过TaskProcessor的process方法来执行任务
nacos-1.1.3/config/src/main/java/com/alibaba/nacos/config/server/service/dump/DumpTask.java
class DumpProcessor implements TaskProcessor {
DumpProcessor(DumpService dumpService) {
this.dumpService = dumpService;
}
@Override
public boolean process(String taskType, AbstractTask task) {
DumpTask dumpTask = (DumpTask)task;
String[] pair = GroupKey2.parseKey(dumpTask.groupKey);
String dataId = pair[0];
String group = pair[1];
String tenant = pair[2];
long lastModified = dumpTask.lastModified;
String handleIp = dumpTask.handleIp;
boolean isBeta = dumpTask.isBeta;
String tag = dumpTask.tag;
if (isBeta) {
// beta发布，则dump数据，更新beta缓存
ConfigInfo4Beta cf = dumpService.persistService.findConfigInfo4Beta(dataId, group, tenant);
boolean result;
if (null != cf) {
result = ConfigService.dumpBeta(dataId, group, tenant, cf.getContent(), lastModified, cf.getBetaIps());
if (result) {
ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
ConfigTraceService.DUMP_EVENT_OK, System.currentTimeMillis() - lastModified,
cf.getContent().length());
}
} else {
result = ConfigService.removeBeta(dataId, group, tenant);
if (result) {
ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
ConfigTraceService.DUMP_EVENT_REMOVE_OK, System.currentTimeMillis() - lastModified, 0);
}
}
return result;
} else {
if (StringUtils.isBlank(tag)) {
ConfigInfo cf = dumpService.persistService.findConfigInfo(dataId, group, tenant);
if (dataId.equals(AggrWhitelist.AGGRIDS_METADATA)) {
if (null != cf) {
AggrWhitelist.load(cf.getContent());
} else {
AggrWhitelist.load(null);
}
}
if (dataId.equals(ClientIpWhiteList.CLIENT_IP_WHITELIST_METADATA)) {
if (null != cf) {
ClientIpWhiteList.load(cf.getContent());
} else {
ClientIpWhiteList.load(null);
}
}
if (dataId.equals(SwitchService.SWITCH_META_DATAID)) {
if (null != cf) {
SwitchService.load(cf.getContent());
} else {
SwitchService.load(null);
}
}
boolean result;
if (null != cf) {
result = ConfigService.dump(dataId, group, tenant, cf.getContent(), lastModified);
if (result) {
ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
ConfigTraceService.DUMP_EVENT_OK, System.currentTimeMillis() - lastModified,
cf.getContent().length());
}
} else {
result = ConfigService.remove(dataId, group, tenant);
if (result) {
ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
ConfigTraceService.DUMP_EVENT_REMOVE_OK, System.currentTimeMillis() - lastModified, 0);
}
}
return result;
} else {
ConfigInfo4Tag cf = dumpService.persistService.findConfigInfo4Tag(dataId, group, tenant, tag);
//
boolean result;
if (null != cf) {
result = ConfigService.dumpTag(dataId, group, tenant, tag, cf.getContent(), lastModified);
if (result) {
ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
ConfigTraceService.DUMP_EVENT_OK, System.currentTimeMillis() - lastModified,
cf.getContent().length());
}
} else {
result = ConfigService.removeTag(dataId, group, tenant, tag);
if (result) {
ConfigTraceService.logDumpEvent(dataId, group, tenant, null, lastModified, handleIp,
ConfigTraceService.DUMP_EVENT_REMOVE_OK, System.currentTimeMillis() - lastModified, 0);
}
}
return result;
}
}
}
final DumpService dumpService;
}DumpProcessor实现了TaskProcessor接口，其process方法主要是根据不同条件执行ConfigService.dump或者remove方法
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