32 lines
975 B
Java
32 lines
975 B
Java
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package ex9;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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public final class Profiler {
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private static final ConcurrentMap<String, List<String>> callLog = new ConcurrentHashMap<>();
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static {
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Runtime.getRuntime().addShutdownHook(new Thread(Profiler::print));
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}
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private Profiler() {
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}
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public static void logCall(final Thread thread, final String methodName) {
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final List<String> list = callLog.computeIfAbsent(thread.getName(), ignored -> new LinkedList<>());
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// thread safe, as once a thread accesses its own list access to said list is non-concurrent
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list.add(methodName);
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}
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private static void print() {
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for (final String threadName : callLog.keySet()) {
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System.out.printf("=== %s ===\n", threadName);
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callLog.get(threadName).forEach(System.out::println);
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}
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}
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}
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