事务时间直方图

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@847 b9813039-fb51-4c41-a8b9-e21c2acb5095
2023-03-04 19:17:16 +00:00 · 2011-09-19 02:00:12 +00:00
parent 7d60b388da
commit 9d0c7d6ee7
3 changed files with 138 additions and 37 deletions
@@ -0,0 +1,69 @@
+package com.alibaba.druid.util;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicLong;
+
+public class Histogram {
+
+    private final long[]       ranges;
+    private final AtomicLong[] rangeCounters;
+
+    public Histogram(long... ranges){
+        this.ranges = ranges;
+        this.rangeCounters = new AtomicLong[ranges.length + 1];
+        for (int i = 0; i < rangeCounters.length; i++) {
+            rangeCounters[i] = new AtomicLong();
+        }
+    }
+
+    public Histogram(TimeUnit timeUnit, long... ranges){
+        this.ranges = new long[ranges.length];
+        for (int i = 0; i < ranges.length; i++) {
+            this.ranges[i] = TimeUnit.MILLISECONDS.convert(ranges[i], timeUnit);
+        }
+
+        rangeCounters = new AtomicLong[ranges.length + 1];
+        for (int i = 0; i < rangeCounters.length; ++i) {
+            rangeCounters[i] = new AtomicLong();
+        }
+    }
+
+    public void reset() {
+        for (int i = 0; i < rangeCounters.length; i++) {
+            rangeCounters[i].set(0);
+        }
+    }
+
+    public void recode(long millis) {
+        int index = rangeCounters.length - 1;
+        for (int i = 0; i < ranges.length; ++i) {
+            if (millis < ranges[i]) {
+                index = i;
+                break;
+            }
+        }
+
+        rangeCounters[index].incrementAndGet();
+    }
+
+    public long get(int index) {
+        return rangeCounters[index].get();
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder strBuilder = new StringBuilder();
+        for (int i = 0; i < ranges.length; i++) {
+            strBuilder.append((i == 0 ? 0l : ranges[i - 1]) + " - " + ranges[i] + " : " + rangeCounters[i] + " ");
+        }
+        return strBuilder.toString();
+    }
+
+    public long[] toArray() {
+        long[] array = new long[rangeCounters.length];
+        for (int i = 0; i < rangeCounters.length; i++) {
+            array[i] = rangeCounters[i].get();
+        }
+        return array;
+    }
+}