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本文主要研究一下PowerJob的OmsLogHandler
OmsLogHandler
tech/powerjob/worker/background/OmsLogHandler.java
代码语言：javascript复制@Slf4j
public class OmsLogHandler {
private final String workerAddress;
private final Transporter transporter;
private final ServerDiscoveryService serverDiscoveryService;
// 处理线程，需要通过线程池启动
public final Runnable logSubmitter = new LogSubmitter();
// 上报锁，只需要一个线程上报即可
private final Lock reportLock = new ReentrantLock();
// 生产者消费者模式，异步上传日志
private final BlockingQueue<InstanceLogContent> logQueue = Queues.newLinkedBlockingQueue(10240);
// 每次上报携带的数据条数
private static final int BATCH_SIZE = 20;
// 本地囤积阈值
private static final int REPORT_SIZE = 1024;
public OmsLogHandler(String workerAddress, Transporter transporter, ServerDiscoveryService serverDiscoveryService) {
this.workerAddress = workerAddress;
this.transporter = transporter;
this.serverDiscoveryService = serverDiscoveryService;
}
/**
* 提交日志
* @param instanceId 任务实例ID
* @param logContent 日志内容
*/
public void submitLog(long instanceId, LogLevel logLevel, String logContent) {
if (logQueue.size() > REPORT_SIZE) {
// 线程的生命周期是个不可循环的过程，一个线程对象结束了不能再次start，只能一直创建和销毁
new Thread(logSubmitter).start();
}
InstanceLogContent tuple = new InstanceLogContent(instanceId, System.currentTimeMillis(), logLevel.getV(), logContent);
boolean offerRet = logQueue.offer(tuple);
if (!offerRet) {
log.warn("[OmsLogHandler] [{}] submit log failed, maybe your log speed is too fast!", instanceId);
}
}
//......
} OmsLogHandler提供了submitLog方法，它先判断logQueue大小是否超过REPORT_SIZE(
1024)，超过则通过异步线程执行logSubmitter；接着将内容包装为InstanceLogContent，然后放入到logQueue
LogSubmitter
代码语言：javascript复制 private class LogSubmitter implements Runnable {
@Override
public void run() {
boolean lockResult = reportLock.tryLock();
if (!lockResult) {
return;
}
try {
final String currentServerAddress = serverDiscoveryService.getCurrentServerAddress();
// 当前无可用 Server
if (StringUtils.isEmpty(currentServerAddress)) {
if (!logQueue.isEmpty()) {
logQueue.clear();
log.warn("[OmsLogHandler] because there is no available server to report logs which leads to queue accumulation, oms discarded all logs.");
}
return;
}
List<InstanceLogContent> logs = Lists.newLinkedList();
while (!logQueue.isEmpty()) {
try {
InstanceLogContent logContent = logQueue.poll(100, TimeUnit.MILLISECONDS);
logs.add(logContent);
if (logs.size() >= BATCH_SIZE) {
WorkerLogReportReq req = new WorkerLogReportReq(workerAddress, Lists.newLinkedList(logs));
// 不可靠请求，WEB日志不追求极致
TransportUtils.reportLogs(req, currentServerAddress, transporter);
logs.clear();
}
}catch (Exception ignore) {
break;
}
}
if (!logs.isEmpty()) {
WorkerLogReportReq req = new WorkerLogReportReq(workerAddress, logs);
TransportUtils.reportLogs(req, currentServerAddress, transporter);
}
}finally {
reportLock.unlock();
}
}
}LogSubmitter实现了Runnable接口，其run方法先通过reportLock加锁，成功才继续，它通过serverDiscoveryService.getCurrentServerAddress()获取当前server的地址，若获取不到则清空logQueue；否则while循环，每次从logQueue拉取InstanceLogContent，放到linkedList，超过BATCH_SIZE(
20)则创建WorkerLogReportReq，通过TransportUtils.reportLogs(req, currentServerAddress, transporter)上报，然后清空linkedList，跳出循环之后再上报剩下的日志，最后释放锁
reportLogs
tech/powerjob/worker/common/utils/TransportUtils.java
代码语言：javascript复制 public static void reportLogs(WorkerLogReportReq req, String address, Transporter transporter) {
final URL url = easyBuildUrl(ServerType.SERVER, S4W_PATH, S4W_HANDLER_REPORT_LOG, address);
transporter.tell(url, req);
}
public static URL easyBuildUrl(ServerType serverType, String rootPath, String handlerPath, String address) {
HandlerLocation handlerLocation = new HandlerLocation()
.setRootPath(rootPath)
.setMethodPath(handlerPath);
return new URL()
.setServerType(serverType)
.setAddress(Address.fromIpv4(address))
.setLocation(handlerLocation);
} reportLogs先通过easyBuildUrl构建URL，再通过transporter.tell(url, req)发送请求，rootPath为server，handlerPath为reportLog
tell
AkkaTransporter
tech/powerjob/remote/akka/AkkaTransporter.java
代码语言：javascript复制 public void tell(URL url, PowerSerializable request) {
ActorSelection actorSelection = fetchActorSelection(url);
actorSelection.tell(request, null);
}AkkaTransporter直接使用actorSelection发送请求
VertxTransporter
tech/powerjob/remote/http/vertx/VertxTransporter.java
代码语言：javascript复制 public void tell(URL url, PowerSerializable request) {
post(url, request, null);
}
private <T> CompletionStage<T> post(URL url, PowerSerializable request, Class<T> clz) {
final String host = url.getAddress().getHost();
final int port = url.getAddress().getPort();
final String path = url.getLocation().toPath();
RequestOptions requestOptions = new RequestOptions()
.setMethod(HttpMethod.POST)
.setHost(host)
.setPort(port)
.setURI(path);
// 获取远程服务器的HTTP连接
Future<HttpClientRequest> httpClientRequestFuture = httpClient.request(requestOptions);
// 转换 -> 发送请求获取响应
Future<HttpClientResponse> responseFuture = httpClientRequestFuture.compose(httpClientRequest ->
httpClientRequest
.putHeader(HttpHeaderNames.CONTENT_TYPE, HttpHeaderValues.APPLICATION_JSON)
.send(JsonObject.mapFrom(request).toBuffer())
);
return responseFuture.compose(httpClientResponse -> {
// throw exception
final int statusCode = httpClientResponse.statusCode();
if (statusCode != HttpResponseStatus.OK.code()) {
// CompletableFuture.get() 时会传递抛出该异常
throw new RemotingException(String.format("request [host:%s,port:%s,url:%s] failed, status: %d, msg: %s",
host, port, path, statusCode, httpClientResponse.statusMessage()
));
}
return httpClientResponse.body().compose(x -> {
if (clz == null) {
return Future.succeededFuture(null);
}
if (clz.equals(String.class)) {
return Future.succeededFuture((T) x.toString());
}
return Future.succeededFuture(x.toJsonObject().mapTo(clz));
});
}).toCompletionStage();
} VertxTransporter则使用post方法通过vertx的httpClient发送请求
processWorkerLogReport
tech/powerjob/server/core/handler/AbWorkerRequestHandler.java
代码语言：javascript复制 @Handler(path = S4W_HANDLER_REPORT_LOG, processType = ProcessType.NO_BLOCKING)
public void processWorkerLogReport(WorkerLogReportReq req) {
WorkerLogReportEvent event = new WorkerLogReportEvent()
.setWorkerAddress(req.getWorkerAddress())
.setLogNum(req.getInstanceLogContents().size());
try {
processWorkerLogReport0(req, event);
event.setStatus(WorkerLogReportEvent.Status.SUCCESS);
} catch (RejectedExecutionException re) {
event.setStatus(WorkerLogReportEvent.Status.REJECTED);
} catch (Throwable t) {
event.setStatus(WorkerLogReportEvent.Status.EXCEPTION);
log.warn("[WorkerRequestHandler] process worker report failed!", t);
} finally {
monitorService.monitor(event);
}
}processWorkerLogReport通过processWorkerLogReport0进行处理，最后通过monitorService.monitor(event)上报监控
processWorkerLogReport0
tech/powerjob/server/core/handler/WorkerRequestHandlerImpl.java
代码语言：javascript复制 @Override
protected void processWorkerLogReport0(WorkerLogReportReq req, WorkerLogReportEvent event) {
// 这个效率应该不会拉垮吧...也就是一些判断 Map#get 吧...
instanceLogService.submitLogs(req.getWorkerAddress(), req.getInstanceLogContents());
}processWorkerLogReport0通过instanceLogService.submitLogs进行上报
submitLogs
tech/powerjob/server/core/instance/InstanceLogService.java
代码语言：javascript复制 /**
* 提交日志记录，持久化到本地数据库中
* @param workerAddress 上报机器地址
* @param logs 任务实例运行时日志
*/
@Async(value = PJThreadPool.LOCAL_DB_POOL)
public void submitLogs(String workerAddress, List<InstanceLogContent> logs) {
List<LocalInstanceLogDO> logList = logs.stream().map(x -> {
instanceId2LastReportTime.put(x.getInstanceId(), System.currentTimeMillis());
LocalInstanceLogDO y = new LocalInstanceLogDO();
BeanUtils.copyProperties(x, y);
y.setWorkerAddress(workerAddress);
return y;
}).collect(Collectors.toList());
try {
CommonUtils.executeWithRetry0(() -> localInstanceLogRepository.saveAll(logList));
}catch (Exception e) {
log.warn("[InstanceLogService] persistent instance logs failed, these logs will be dropped: {}.", logs, e);
}
}InstanceLogService通过PJThreadPool.LOCAL_DB_POOL线程池进行异步，它通过localInstanceLogRepository.saveAll(logList)保存到本地数据库
monitor
tech/powerjob/server/monitor/PowerJobMonitorService.java
代码语言：javascript复制 public void monitor(Event event) {
monitors.forEach(m -> m.record(event));
}monitor方法遍历monitors，挨个执行record
LogMonitor
tech/powerjob/server/monitor/monitors/LogMonitor.java
代码语言：javascript复制 public void record(Event event) {
MDC.put(MDC_KEY_SERVER_ID, String.valueOf(serverInfo.getId()));
LoggerFactory.getLogger(event.type()).info(event.message());
}LogMonitor的record方法通过日志打印event信息
小结
PowerJob的OmsLogHandler提供了submitLog方法，它先判断logQueue大小是否超过REPORT_SIZE(1024)，超过则通过异步线程执行logSubmitter；接着将内容包装为InstanceLogContent，然后放入到logQueue；logSubmitter主要是执行reportLogs，它先通过easyBuildUrl构建URL，再通过transporter.tell(url, req)发送请求，rootPath为server，handlerPath为reportLog；服务端的processWorkerLogReport通过processWorkerLogReport0进行处理(通过localInstanceLogRepository.saveAll(logList)保存到本地数据库)，最后通过monitorService.monitor(event)上报监控。
