Drools 7 JMX Mbean 及Metric 分析

Mbean

mbean的打开很简单，使用jmx启动参数：

 -Dcom.sun.management.jmxremote.port=9999 -Ddrools.mbeans=enabled   -Dcom.sun.management.jmxremote.authenticate=false    -Dcom.sun.management.jmxremote.ssl=false

但通过jconsole能直观看到的东西也很少
在这里插入图片描述

如果有必要，需要使用代码进一步自行分析，以下是7支持的mbean

Metric

Metric 在doc里面提的很少，几个关键点

输出只能在log 和micrometer 二选一
只有时间超过threshold才记录
只有部分操作记录

输出2选1，及threshold都在以下metric核心类的如下代码中

 public void logAndEndMetrics() {if (this.enabled) {NodeStats stats = (NodeStats)this.nodeStats.get();if (stats != null && stats.isStarted()) {long evalCount = stats.getEvalCount();long elapsedTimeInNanos = System.nanoTime() - stats.getStartTime();long elapsedTimeInMicro = elapsedTimeInNanos / 1000L;if (evalCount > 0L && elapsedTimeInMicro > (long)this.threshold) {if (this.micrometerAvailable) {MicrometerUtils.INSTANCE.triggerMicrometer(stats.getNode(), evalCount, elapsedTimeInNanos);} else {logger.trace("{}, evalCount:{}, elapsedMicro:{}", new Object[]{stats.getNode(), evalCount, elapsedTimeInMicro});}}} else {logger.warn("nodeStats has to be initialized. Call startMetrics() beforehand : stats = {}", stats);}this.nodeStats.remove();}}

只有部分操作记录其实也和上述代码的evalCount 必须大于0有关，以下面的drl 为例：

rule "Always Stateless World"dialect "java"whenm : Message( status >-1 )if (  m.getStatus()>2  ) do[giveDiscount]thenSystem.out.println( "Always  Stateless message" );Thread.sleep(2000);then[giveDiscount]System.out.println( "  do---- "  );
endrule "Stateless Hello World"dialect "mvel"whenm : Message( status == Message.HELLO, message : message )thenSystem.out.println( message );//        modify ( m ) { setMessage( "Goodbyte Stateless cruel world" ),
//                       setStatus( Message.GOODBYE ) };modify ( m ) { message = "Goodbye cruel world",status = Message.GOODBYE };Thread.sleep(1000);
end

只有如下仅仅ConditionalBranchNode的输出：

 15:08:56.014 [main] TRACE o.drools.metric.util.MetricLogUtils.logAndEndMetrics:94 - [ConditionalBranchNode: cond=if ( org.drools.examples.helloStateLess.Rule_Always_Stateless_World278963341Eval0Invoker@d53a879c ) do[[RuleTerminalNode(6): rule=Always Stateless World, consequence=giveDiscount]]], evalCount:1, elapsedMicro:175
Always  Stateless message
Stateless Goodbye cruel world
status=1,Goodbye cruel world