bug #I41S18 在开启监控的情况下，偶尔会报出空指针的问题

liteflow-core/src/main/java/com/yomahub/liteflow/entity/monitor/CompStatistics.java

@@ -11,7 +11,7 @@ package com.yomahub.liteflow.entity.monitor;
  * 统计类
  * @author Bryan.Zhang
  */
-public class CompStatistics implements Comparable{
+public class CompStatistics implements Comparable<CompStatistics>{
 
 	private String componentClazzName;
 
@@ -55,9 +55,9 @@ public class CompStatistics implements Comparable{
 	}
 	
 	@Override
-	public int compareTo(Object o) {
-		if( o instanceof CompStatistics) {
-			return this.recordTime >= ((CompStatistics) o).getRecordTime()  ? -1 : 1;
+	public int compareTo(CompStatistics o) {
+		if(o != null) {
+			return this.recordTime >= o.getRecordTime()  ? -1 : 1;
 		}
 		return 1;
 	}

liteflow-core/src/main/java/com/yomahub/liteflow/monitor/MonitorBus.java

@@ -19,9 +19,7 @@ import java.util.Map.Entry;
 import java.util.Timer;
 import java.util.concurrent.ConcurrentHashMap;
 
-import cn.hutool.core.util.ObjectUtil;
-import cn.hutool.core.collection.BoundedPriorityQueue;
-
+import com.yomahub.liteflow.util.BoundedPriorityBlockingQueue;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -40,7 +38,7 @@ public class MonitorBus {
 
 	private final Logger LOG = LoggerFactory.getLogger(this.getClass());
 
-	private final ConcurrentHashMap<String, BoundedPriorityQueue<CompStatistics>> statisticsMap = new ConcurrentHashMap<>();
+	private final ConcurrentHashMap<String, BoundedPriorityBlockingQueue<CompStatistics>> statisticsMap = new ConcurrentHashMap<>();
 
 	public MonitorBus(LiteflowConfig liteflowConfig) {
 		this.liteflowConfig = liteflowConfig;
@@ -55,7 +53,7 @@ public class MonitorBus {
 		if(statisticsMap.containsKey(statistics.getComponentClazzName())){
 			statisticsMap.get(statistics.getComponentClazzName()).add(statistics);
 		}else{
-			BoundedPriorityQueue<CompStatistics> queue = new BoundedPriorityQueue<>(liteflowConfig.getQueueLimit());
+			BoundedPriorityBlockingQueue<CompStatistics> queue = new BoundedPriorityBlockingQueue<>(liteflowConfig.getQueueLimit());
 			queue.offer(statistics);
 			statisticsMap.put(statistics.getComponentClazzName(), queue);
 		}
@@ -65,7 +63,7 @@ public class MonitorBus {
 		try{
 			Map<String, BigDecimal> compAverageTimeSpent = new HashMap<String, BigDecimal>();
 			
-			for(Entry<String, BoundedPriorityQueue<CompStatistics>> entry : statisticsMap.entrySet()){
+			for(Entry<String, BoundedPriorityBlockingQueue<CompStatistics>> entry : statisticsMap.entrySet()){
 				long totalTimeSpent = 0;
 				for(CompStatistics statistics : entry.getValue()){
 					totalTimeSpent += statistics.getTimeSpent();

liteflow-core/src/main/java/com/yomahub/liteflow/util/BoundedPriorityBlockingQueue.java

@@ -0,0 +1,81 @@
+package com.yomahub.liteflow.util;
+
+import java.util.*;
+import java.util.concurrent.PriorityBlockingQueue;
+
+public class BoundedPriorityBlockingQueue<E> extends PriorityBlockingQueue<E> {
+
+    private static final long serialVersionUID = -1;
+
+    //容量
+    private final int capacity;
+    private final Comparator<? super E> comparator;
+
+    public BoundedPriorityBlockingQueue(int capacity) {
+        this(capacity, null);
+    }
+
+    /**
+     * 构造
+     * @param capacity 容量
+     * @param comparator 比较器
+     */
+    public BoundedPriorityBlockingQueue(int capacity, final Comparator<? super E> comparator) {
+        super(capacity, (o1, o2) -> {
+            int cResult;
+            if(comparator != null) {
+                cResult = comparator.compare(o1, o2);
+            }else {
+                @SuppressWarnings("unchecked")
+                Comparable<E> o1c = (Comparable<E>)o1;
+                cResult = o1c.compareTo(o2);
+            }
+
+            return - cResult;
+        });
+        this.capacity = capacity;
+        this.comparator = comparator;
+    }
+
+    /**
+     * 加入元素，当队列满时，淘汰末尾元素
+     * @param e 元素
+     * @return 加入成功与否
+     */
+    @Override
+    public boolean offer(E e) {
+        if(size() >= capacity) {
+            E head = peek();
+            if (this.comparator().compare(e, head) <= 0){
+                return true;
+            }
+            //当队列满时，就要淘汰顶端队列
+            poll();
+        }
+        return super.offer(e);
+    }
+
+    /**
+     * 添加多个元素<br>
+     * 参数为集合的情况请使用{@link PriorityQueue#addAll}
+     * @param c 元素数组
+     * @return 是否发生改变
+     */
+    public boolean addAll(E[] c) {
+        return this.addAll(Arrays.asList(c));
+    }
+
+    /**
+     * @return 返回排序后的列表
+     */
+    public ArrayList<E> toList() {
+        final ArrayList<E> list = new ArrayList<>(this);
+        list.sort(comparator);
+        return list;
+    }
+
+    @Override
+    public Iterator<E> iterator() {
+        return toList().iterator();
+    }
+}

liteflow-spring-boot-starter/src/main/java/com/yomahub/liteflow/springboot/LiteflowMainAutoConfiguration.java

@@ -16,6 +16,7 @@ import org.springframework.context.annotation.Import;
  * 主要的业务装配器
  * 在这个装配器里装配了执行器，执行器初始化类，监控器
  * 这个装配前置条件是需要LiteflowConfig，LiteflowPropertyAutoConfiguration以及SpringAware
+ *
  * @author Bryan.Zhang
  */
 @Configuration
@@ -37,12 +38,13 @@ public class LiteflowMainAutoConfiguration {
     }
 
     @Bean
-    @ConditionalOnProperty(prefix = "liteflow",name = "parse-on-start",havingValue = "true")
+    @ConditionalOnProperty(prefix = "liteflow", name = "parse-on-start", havingValue = "true")
     public LiteflowExecutorInit liteflowExecutorInit(FlowExecutor flowExecutor) {
         return new LiteflowExecutorInit(flowExecutor);
     }
 
     @Bean
+    @ConditionalOnProperty(prefix = "liteflow", name = "monitor.enable-log", havingValue = "true")
     public MonitorBus monitorBus(LiteflowConfig liteflowConfig) {
         return new MonitorBus(liteflowConfig);
     }