24 package gc.testlibrary;
25
26 import sun.jvmstat.monitor.Monitor;
27
28 /**
29 * Represents a performance counter in the JVM.
30 *
31 * See http://openjdk.java.net/groups/hotspot/docs/Serviceability.html#bjvmstat
32 * for more details about performance counters.
33 */
34 public class PerfCounter {
35 private final Monitor monitor;
36 private final String name;
37
38 PerfCounter(Monitor monitor, String name) {
39 this.monitor = monitor;
40 this.name = name;
41 }
42
43 /**
44 * Returns the value of this performance counter as a long.
45 *
46 * @return The long value of this performance counter
47 * @throws RuntimeException If the value of the performance counter isn't a long
48 */
49 public long longValue() {
50 Object value = monitor.getValue();
51 if (value instanceof Long) {
52 return ((Long) value).longValue();
53 }
54 throw new RuntimeException("Expected " + monitor.getName() + " to have a long value");
55 }
56
57 /**
58 * Returns the name of the performance counter.
59 *
60 * @return The name of the performance counter.
61 */
62 public String getName() {
63 return name;
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24 package gc.testlibrary;
25
26 import sun.jvmstat.monitor.Monitor;
27
28 /**
29 * Represents a performance counter in the JVM.
30 *
31 * See http://openjdk.java.net/groups/hotspot/docs/Serviceability.html#bjvmstat
32 * for more details about performance counters.
33 */
34 public class PerfCounter {
35 private final Monitor monitor;
36 private final String name;
37
38 PerfCounter(Monitor monitor, String name) {
39 this.monitor = monitor;
40 this.name = name;
41 }
42
43 /**
44 * Returns the value of this performance counter as an Object.
45 *
46 * @return The value of this performance counter
47 */
48 public Object value() {
49 return monitor.getValue();
50 }
51
52 /**
53 * Returns the value of this performance counter as a long.
54 *
55 * @return The long value of this performance counter
56 * @throws RuntimeException If the value of the performance counter isn't a long
57 */
58 public long longValue() {
59 Object value = monitor.getValue();
60 if (value instanceof Long) {
61 return ((Long) value).longValue();
62 }
63 throw new RuntimeException("Expected " + monitor.getName() + " to have a long value");
64 }
65
66 /**
67 * Returns the name of the performance counter.
68 *
69 * @return The name of the performance counter.
70 */
71 public String getName() {
72 return name;
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