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25 
26 package sun.tools.jconsole;
27 
28 import javax.management.ObjectName;
29 import java.lang.management.MemoryPoolMXBean;
30 import java.lang.management.MemoryUsage;
31 import com.sun.management.GarbageCollectorMXBean;
32 import com.sun.management.GcInfo;
33 import java.util.HashMap;
34 import java.util.Set;
35 import java.util.Map;
36 
37 import static java.lang.management.ManagementFactory.*;
38 
39 public class MemoryPoolProxy {
40     private String poolName;
41     private ProxyClient client;
42     private MemoryPoolMXBean pool;
43     private Map<ObjectName,Long> gcMBeans;
44     private GcInfo lastGcInfo;
45 
MemoryPoolProxy(ProxyClient client, ObjectName poolName)46     public MemoryPoolProxy(ProxyClient client, ObjectName poolName) throws java.io.IOException {
47         this.client = client;
48         this.pool = client.getMXBean(poolName, MemoryPoolMXBean.class);
49         this.poolName = this.pool.getName();
50         this.gcMBeans = new HashMap<ObjectName,Long>();
51         this.lastGcInfo = null;
52 
53         String[] mgrNames = pool.getMemoryManagerNames();
54         for (String name : mgrNames) {
55             try {
56                 ObjectName mbeanName = new ObjectName(GARBAGE_COLLECTOR_MXBEAN_DOMAIN_TYPE +
57                                                       ",name=" + name);
58                 if (client.isRegistered(mbeanName)) {
59                     gcMBeans.put(mbeanName, 0L);
60                 }
61             } catch (Exception e) {
62                 assert false;
63             }
64 
65         }
66     }
67 
isCollectedMemoryPool()68     public boolean isCollectedMemoryPool() {
69         return (gcMBeans.size() != 0);
70     }
71 
getStat()72     public MemoryPoolStat getStat() throws java.io.IOException {
73         long usageThreshold = (pool.isUsageThresholdSupported()
74                                   ? pool.getUsageThreshold()
75                                   : -1);
76         long collectThreshold = (pool.isCollectionUsageThresholdSupported()
77                                   ? pool.getCollectionUsageThreshold()
78                                   : -1);
79         long lastGcStartTime = 0;
80         long lastGcEndTime = 0;
81         MemoryUsage beforeGcUsage = null;
82         MemoryUsage afterGcUsage = null;
83         long gcId = 0;
84         if (lastGcInfo != null) {
85             gcId = lastGcInfo.getId();
86             lastGcStartTime = lastGcInfo.getStartTime();
87             lastGcEndTime = lastGcInfo.getEndTime();
88             beforeGcUsage = lastGcInfo.getMemoryUsageBeforeGc().get(poolName);
89             afterGcUsage = lastGcInfo.getMemoryUsageAfterGc().get(poolName);
90         }
91 
92         Set<Map.Entry<ObjectName,Long>> set = gcMBeans.entrySet();
93         for (Map.Entry<ObjectName,Long> e : set) {
94             GarbageCollectorMXBean gc =
95                 client.getMXBean(e.getKey(),
96                                  com.sun.management.GarbageCollectorMXBean.class);
97             Long gcCount = e.getValue();
98             Long newCount = gc.getCollectionCount();
99             if (newCount > gcCount) {
100                 gcMBeans.put(e.getKey(), newCount);
101                 lastGcInfo = gc.getLastGcInfo();
102                 if (lastGcInfo.getEndTime() > lastGcEndTime) {
103                     gcId = lastGcInfo.getId();
104                     lastGcStartTime = lastGcInfo.getStartTime();
105                     lastGcEndTime = lastGcInfo.getEndTime();
106                     beforeGcUsage = lastGcInfo.getMemoryUsageBeforeGc().get(poolName);
107                     afterGcUsage = lastGcInfo.getMemoryUsageAfterGc().get(poolName);
108                     assert(beforeGcUsage != null);
109                     assert(afterGcUsage != null);
110                 }
111             }
112         }
113 
114         MemoryUsage usage = pool.getUsage();
115         return new MemoryPoolStat(poolName,
116                                   usageThreshold,
117                                   usage,
118                                   gcId,
119                                   lastGcStartTime,
120                                   lastGcEndTime,
121                                   collectThreshold,
122                                   beforeGcUsage,
123                                   afterGcUsage);
124     }
125 }
126