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1
7 package org.jboss.web.loadbalancer.scheduler;
8
9
15 public class HostStatistics
16 {
17 private static final int NUM_SAMPLES=50;
18
19 private volatile long numRequests;
20 private volatile long sumResponseTime;
21 private volatile int currentConnections=0;
22 private volatile int[] lastResponseTimes=new int[NUM_SAMPLES];
23 private volatile int index=0;
24
25 public void addRequest(int responseTime)
26 {
27 numRequests++;
28 sumResponseTime+=responseTime;
29
30 try
31 {
32 lastResponseTimes[index]=responseTime;
33 index++;
34 }
35 catch (ArrayIndexOutOfBoundsException  aioobe)
36 {
37 index=0;
38 }
39 }
40
41 public void reset()
42 {
43 sumResponseTime=0L;
44 numRequests=0L;
45 lastResponseTimes=new int[NUM_SAMPLES];
46 index=0;
47 }
48
49 public int getAvgResponseTime()
50 {
51 return sumLastResponseTimes()/NUM_SAMPLES;
52 }
53
54 public long getNumRequests()
55 {
56 return numRequests;
57 }
58
59 public long getSumResponseTime()
60 {
61 return sumResponseTime;
62 }
63
64 public int getCurrentConnections()
65 {
66 return currentConnections;
67 }
68
69 public void incCurrentConnections()
70 {
71 currentConnections++;
72 }
73
74 public void decCurrentConnections()
75 {
76 currentConnections--;
77 }
78
79 public String toString()
80 {
81 return "[CurrentConnections="+currentConnections+", Requests="+numRequests+", AvgResponseTime="+getAvgResponseTime()+"]";
82 }
83
84 private int sumLastResponseTimes()
85 {
86 int sum=0;
87
88 for (int i=0;i<NUM_SAMPLES;++i)
89 {
90 sum+=lastResponseTimes[i];
91 }
92
93 return sum;
94 }
95 }
96 |
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