ttl-core/src/main/java/com/alibaba/ttl3/TtlTimerTask.java [138:147]:
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    public static TtlTimerTask get(@Nullable TimerTask timerTask, boolean releaseTtlValueReferenceAfterRun, boolean idempotent) {
        if (timerTask == null) return null;

        if (timerTask instanceof TtlEnhanced) {
            // avoid redundant decoration, and ensure idempotency
            if (idempotent) return (TtlTimerTask) timerTask;
            else throw new IllegalStateException("Already TtlTimerTask!");
        }
        return new TtlTimerTask(timerTask, releaseTtlValueReferenceAfterRun);
    }
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ttl2-compatible/src/main/java/com/alibaba/ttl/TtlTimerTask.java [149:158]:
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    public static TtlTimerTask get(@Nullable TimerTask timerTask, boolean releaseTtlValueReferenceAfterRun, boolean idempotent) {
        if (timerTask == null) return null;

        if (timerTask instanceof TtlEnhanced) {
            // avoid redundant decoration, and ensure idempotency
            if (idempotent) return (TtlTimerTask) timerTask;
            else throw new IllegalStateException("Already TtlTimerTask!");
        }
        return new TtlTimerTask(timerTask, releaseTtlValueReferenceAfterRun);
    }
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