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1
4 package com.tc.runtime;
5
6 import com.tc.logging.TCLogger;
7 import com.tc.logging.TCLogging;
8
9 import java.lang.management.GarbageCollectorMXBean  ;
10 import java.lang.management.ManagementFactory ;
11 import java.lang.management.MemoryMXBean ;
12 import java.lang.management.MemoryPoolMXBean ;
13 import java.lang.management.MemoryType ;
14 import java.util.ArrayList ;
15 import java.util.Arrays ;
16 import java.util.HashMap ;
17 import java.util.Iterator ;
18 import java.util.List ;
19
20 class TCMemoryManagerJdk15 implements JVMMemoryManager {
21
22 private static final String OLD_GEN_NAME = "OLD GEN";
23 private static final String TENURED_GEN_NAME = "TENURED GEN";
25
26 private static final TCLogger logger = TCLogging.getLogger(TCMemoryManagerJdk15.class);
27
28 private final MemoryMXBean memoryBean;
29
30 private final MemoryPoolMXBean oldGenBean;
31 private final GarbageCollectorMXBean oldGenCollectorBean;
32
33 public TCMemoryManagerJdk15() {
34 memoryBean = ManagementFactory.getMemoryMXBean();
35 java.lang.management.MemoryUsage heapUsage = memoryBean.getHeapMemoryUsage();
36 if (heapUsage.getMax() <= 0) {
37 logger.warn("Please specify Max memory using -Xmx flag for Memory manager to work properly");
38 }
39 oldGenBean = getOldGenMemoryPoolBean();
40 oldGenCollectorBean = getOldGenCollectorBean();
41 }
42
43 private MemoryPoolMXBean getOldGenMemoryPoolBean() {
44 List pools = ManagementFactory.getMemoryPoolMXBeans();
45 List <String > poolNames = new ArrayList <String >();
46 for (Iterator i = pools.iterator(); i.hasNext();) {
47 MemoryPoolMXBean mpBean = (MemoryPoolMXBean ) i.next();
48 String name = mpBean.getName();
49 poolNames.add(name);
50 if (mpBean.getType() == MemoryType.HEAP && isOldGen(name)) {
51 return mpBean;
53 }
54 }
55 throw new AssertionError ("Old or Tenured Memory pool Not found : " + poolNames);
56 }
57
58 private GarbageCollectorMXBean getOldGenCollectorBean() {
59 List gcs = ManagementFactory.getGarbageCollectorMXBeans();
60 HashMap <String , List <String >> gcs2Pools = new HashMap <String , List <String >>();
61 for (Iterator i = gcs.iterator(); i.hasNext();) {
62 GarbageCollectorMXBean gc = (GarbageCollectorMXBean ) i.next();
63 String [] managedPools = gc.getMemoryPoolNames();
64 if (gc.isValid() && managedPools != null) {
65 for (int j = 0; j < managedPools.length; j++) {
66 if (isOldGen(managedPools[j])) {
67 return gc;
68 }
69 }
70 gcs2Pools.put(gc.getName(), Arrays.asList(managedPools));
71 }
72 }
73 throw new AssertionError ("Old or Tenured Memory pool does not have a garbage collector : " + gcs2Pools);
74 }
75
76 private boolean isOldGen(String name) {
77 return (name.toUpperCase().indexOf(OLD_GEN_NAME) > -1 || name.toUpperCase().indexOf(TENURED_GEN_NAME) > -1);
78 }
79
80 public boolean isMemoryPoolMonitoringSupported() {
81 return true;
82 }
83
84 public MemoryUsage getMemoryUsage() {
85 java.lang.management.MemoryUsage heapUsage = memoryBean.getHeapMemoryUsage();
86 return new Jdk15MemoryUsage(heapUsage, "VM 1.5 Heap Usage");
88 }
89
90 public MemoryUsage getOldGenUsage() {
91 java.lang.management.MemoryUsage oldGenUsage = oldGenBean.getUsage();
92 return new Jdk15MemoryUsage(oldGenUsage, oldGenBean.getName(), oldGenCollectorBean.getCollectionCount());
93 }
94
95 private static final class Jdk15MemoryUsage implements MemoryUsage {
96
97 private final long max;
98 private final long free;
99 private final long used;
100 private final int usedPercentage;
101 private final String desc;
102 private final long collectionCount;
103
104 public Jdk15MemoryUsage(java.lang.management.MemoryUsage stats, String desc, long collectionCount) {
105 long statsMax = stats.getMax();
106 if (statsMax <= 0) {
107 this.max = stats.getCommitted();
108 } else {
109 this.max = statsMax;
110 }
111 this.used = stats.getUsed();
112 this.free = this.max - this.used;
113 this.usedPercentage = (int) (this.used * 100 / this.max);
114 this.desc = desc;
115 this.collectionCount = collectionCount;
116 }
117
118 public Jdk15MemoryUsage(java.lang.management.MemoryUsage usage, String desc) {
120 this(usage, desc, -1);
121 }
122
123 public String getDescription() {
124 return desc;
125 }
126
127 public long getFreeMemory() {
128 return free;
129 }
130
131 public int getUsedPercentage() {
132 return usedPercentage;
133 }
134
135 public long getMaxMemory() {
136 return max;
137 }
138
139 public long getUsedMemory() {
140 return used;
141 }
142
143 public String toString() {
144 return "Jdk15MemoryUsage ( max = " + max + ", used = " + used + ", free = " + free + ", used % = "
145 + usedPercentage + ", collectionCount = " + collectionCount +" )";
146 }
147
148 public long getCollectionCount() {
149 return collectionCount;
150 }
151
152 }
153 }
154 |
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