67 lines
1.8 KiB
Java
67 lines
1.8 KiB
Java
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package ex7;
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import java.util.Map;
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import java.util.Objects;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.atomic.LongAdder;
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public final class Profiler {
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private static final class MonitorEntry {
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private final int hashCode;
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private final String name;
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public MonitorEntry(int hashCode, String name) {
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this.hashCode = hashCode;
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this.name = name;
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}
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public int getHashCode() {
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return hashCode;
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}
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public String getName() {
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return name;
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}
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@Override
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public boolean equals(Object o) {
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if (this == o) return true;
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if (o == null || getClass() != o.getClass()) return false;
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MonitorEntry that = (MonitorEntry) o;
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return hashCode == that.hashCode && Objects.equals(name, that.name);
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}
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@Override
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public int hashCode() {
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return Objects.hash(hashCode, name);
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}
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}
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private static final Map<MonitorEntry, LongAdder> monitorToAccessCount = new ConcurrentHashMap<>();
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static {
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Runtime.getRuntime().addShutdownHook(new Thread(() -> {
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for (final var entry : monitorToAccessCount.entrySet()) {
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System.out.printf("%d - %s - #Locks: %d%n",
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entry.getKey().getHashCode(),
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entry.getKey().getName(),
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entry.getValue().intValue()
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);
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}
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}));
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}
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private Profiler() {
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}
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public static void countMonitorAccess(final Object obj) {
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final MonitorEntry monitorEntry = new MonitorEntry(obj.hashCode(), obj.getClass().getName());
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monitorToAccessCount.computeIfAbsent(monitorEntry, k -> new LongAdder());
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monitorToAccessCount.get(monitorEntry).increment();
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}
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}
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