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/** */
public static final class TestCustomMetricsService implements TestService {
    /** */
    @IgniteInstanceResource
    private Ignite ignite;

    /** */
    @ServiceContextResource
    private ServiceContext ctx;

    /** */
    private AtomicReference<UUID> remoteId;

    /** */
    private final AtomicInteger metricValue = new AtomicInteger();

    /** {@inheritDoc} */
    @Override public void init() throws Exception {
        remoteId = new AtomicReference<>();

        ignite.metrics().customRegistry(regName(ctx.name())).gauge("filteredInvocation", metricValue::get, "Counter of speceific service invocation.");

        ignite.metrics().customRegistry(regName(ctx.name())).gauge(LOAD_THRESHOLD_METRIC_NAME"loaded", () -> metricValue.get() >= 100, "Load flag.");

        ignite.metrics().customRegistry(regName(ctx.name())).gauge("loadedremote.classId", () -> remoteId.get(), UUID.class, "Remote system class id.");
    }

    /** {@inheritDoc} */
    @Override public void cancel() {
        refresh();

        ignite.metrics().customRegistry(regName(ctx.name())).remove(COUNTER_METRIC_NAME);
    }

    /** {@inheritDoc} */
    @Override public void refresh() {
        metricValue.set(0);

        remoteId.set(null);
    }

    /** */
    @Override public void invoke(int param) {
        if (ctx.isCancelled())
            return;

        remoteId.compareAndSet(null, UUID.randomUUID());

        // Updates metric sometimes.
        if (!ctx.isCancelled() && param % 10 == 0)
            metricValue.set(param / 10);
    }

    /** */
    private static String regName(String svcName) {
        return "service." + svcName;
    }
}

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