序本文主要研究一下jvm的direct buffer统计spring boot metricsjvm.memory.used {代码...} jvm.memory.used包括heap和nonheap两大类heap[链接] {代码...} heap的话根据具体的垃圾收集器类型有不同的区分nonheap[链接] {代码...} nonheap这里包括3个，分别是Metaspace、Compressed Class Space、Code Cachejvm.buffer.mem...

序本文主要研究一下PowerJob的DispatchStrategyDispatchStrategytech/powerjob/common/enums/DispatchStrategy.java {代码...} DispatchStrategy定义了HEALTH_FIRST、RANDOM两个枚举值getSuitableWorkerstech/powerjob/server/remote/worker/WorkerClusterQueryService.java {代码...} WorkerClusterQueryService的getSu...

tech/powerjob/official/processors/impl/script/AbstractScriptProcessor.java

AbstractSqlProcessor继承了CommonBasicProcessor，其process0先将入参解析为SqlParams，然后调用validateParams进行参数校验，针对sqlParser不为null的会通过sqlParser进行解析，接着通过validateSql校验sql，最后通过executeSql执行sql；它定义了getConnection抽象方法，提供了setSqlParser、registerSqlValidator方法

序本文主要研究一下PowerJob的FileCleanupProcessorBroadcastProcessortech/powerjob/worker/core/processor/sdk/BroadcastProcessor.java {代码...} BroadcastProcessor继承了BasicProcessor，它提供了preProcess、postProcess方法FileCleanupProcessortech/powerjob/official/processors/impl/FileCleanupProcessor.ja...

序本文主要研究一下PowerJob的HttpProcessorBasicProcessortech/powerjob/worker/core/processor/sdk/BasicProcessor.java {代码...} BasicProcessor是适用于单机运行的基础处理器，它定于了process方法CommonBasicProcessortech/powerjob/official/processors/CommonBasicProcessor.java {代码...} CommonBasicProcesso...

这两年互联网逐步走下神坛，各种裁员优化的新闻，程序员35岁如果不升到P8或者管理层，基本职业生涯到头了，投简历也差不多无人问津了，现在的职场是95后的天下了，谁还愿意招比自己年纪大，薪资要求又高的老程序员呢，虽然阿里云、语雀、滴滴各个厂分别贡献了降本增笑的谈资，但是现实确实很残酷。35+的一线程序员该何去...

HeavyTaskTracker的dispatchTask方法通过TransportUtils.ttStartPtTask将任务派发到ProcessorTracker

序本文主要研究一下PowerJob的StoreStrategyStoreStrategytech/powerjob/worker/common/constants/StoreStrategy.java {代码...} StoreStrategy枚举定义了DISK、MEMORY两个枚举ConnectionFactorytech/powerjob/worker/persistence/ConnectionFactory.java {代码...} ConnectionFactory在initDatasource的时候会根据Store...

HeavyTaskTracker继承了TaskTracker，它也是个抽象类，其构造器主要是创建了ProcessorTrackerStatusHolder、taskId2BriefInfo、SegmentLock；它定义了抽象方法initTaskTracker；它提供了updateAppendedWfContext、updateTaskStatus、submitTask、receiveProcessorTrackerHeartbeat、broadcast方法；它实现了destroy、sto...

TaskTracker是个抽象类，其构造器接收ServerScheduleJobReq、WorkerRuntime，然后根据ServerScheduleJobReq构建InstanceInfo；它定义了destroy、stopTask、fetchRunningStatus抽象方法

序本文主要研究一下PowerJob的RemoteEngineRemoteEnginetech/powerjob/remote/framework/engine/RemoteEngine.java {代码...} RemoteEngine定义了start及close方法，其中start接收EngineConfig参数返回EngineOutputEngineConfigtech/powerjob/remote/framework/engine/EngineConfig.java {代码...} EngineConfig定义了se...

WorkerHealthReporter实现了Runnable接口，其run方法先获取currentServer，再获取systemMetrics，接着构建WorkerHeartbeat，最后通过TransportUtils.reportWorkerHeartbeat上报

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

ServerDiscoveryService定义了currentServerAddress、ip2Address、服务发现url模版，失败次数，最大失败次数

序本文主要研究一下PowerJob的ProcessorLoaderProcessorLoadertech/powerjob/worker/processor/ProcessorLoader.java {代码...} ProcessorLoader定义了load方法，用于根据ProcessorDefinition加载ProcessorBeanProcessorDefinitiontech/powerjob/worker/extension/processor/ProcessorDefinition.java {代码...} Process...

Worker定义了enabled、appName、port(默认27777)、serverAddress(支持多个ip:port用逗号分隔)、protocol(默认为akka，也支持http)、storeStrategy(默认为disk，也支持memory，主要是配置H2数据库的存储模式)、maxResultLength(返回结果的最大长度，默认为8192)、enableTestMode(默认为false，主要用于没有部署server的场...

h2的Profiler的getRunnableStackTraces方法通过Thread.getAllStackTraces()来收集线程堆栈

LoggingEventAsyncDisruptorAppender继承了DelegatingAsyncDisruptorAppender，它定义了includeCallerData属性，其prepareForDeferredProcessing在includeCallerData为true时执行event.getCallerData()

AsyncAppender继承了ContextAwareBase，同时实现了Appender、AppenderAttachable、CoreSubscriber接口

ListenableFuture继承了java.util.concurrent.Future，它定义了done、abort、touch、addListener、toCompletableFuture方法

SignatureCalculator定义了calculateAndAddSignature接口，它首先计算签名，然后添加到requestBuilder

ClientStats通过Map<String, HostStats>维护了每个host对应的统计；它提供了getStatsPerHost、getTotalConnectionCount、getTotalActiveConnectionCount、getTotalIdleConnectionCount方法

序本文主要研究一下AsyncHttpClient的TimeoutTimerTaskTimerTaskio/netty/util/TimerTask.java {代码...} netty的TimerTask接口定义了run方法，其入参为TimeoutTimeoutio/netty/util/Timeout.java {代码...} Timeout接口定义了timer()、task()、isExpired()、isCancelled()、cancel()方法TimeoutTimerTaskorg/asynchttpc...

序本文主要研究一下AsyncHttpClient的IOExceptionFilterIOExceptionFilterorg/asynchttpclient/filter/IOExceptionFilter.java {代码...} IOExceptionFilter接口定义了filter方法，在捕获到IOException的时候执行ResumableIOExceptionFilterorg/asynchttpclient/handler/resumable/ResumableIOExceptionFilter.java {代...

序本文主要研究一下AsyncHttpClient的RequestFilterRequestFilterorg/asynchttpclient/filter/RequestFilter.java {代码...} RequestFilter定义了filter方法ThrottleRequestFilterorg/asynchttpclient/filter/ThrottleRequestFilter.java {代码...} ThrottleRequestFilter实现了RequestFilter接口，它使用Semaphore来对r...

序本文主要研究一下AsyncHttpClient的KeepAliveStrategyKeepAliveStrategyorg/asynchttpclient/channel/KeepAliveStrategy.java {代码...} KeepAliveStrategy接口定义了keepAlive方法用于决定是否对该connection进行keep aliveDefaultKeepAliveStrategyorg/asynchttpclient/channel/DefaultKeepAliveStrategy.java {代码...

序本文主要研究一下AsyncHttpClient的exceptionChannelClosedExceptionorg/asynchttpclient/exception/ChannelClosedException.java {代码...} ChannelClosedException用于表示Channel closed的异常handleUnexpectedClosedChannelorg/asynchttpclient/netty/request/NettyRequestSender.java {代码...} NettyRequestSend...

org/springframework/boot/autoconfigure/web/servlet/WebMvcProperties.java

ChannelPool定义了offer、poll、removeAll、isOpen、destroy、flushPartitions、getIdleChannelCountPerHost方法，它有两个实现类，分别是NoopChannelPool及DefaultChannelPool