hugegraph-client/src/main/java/org/apache/hugegraph/serializer/direct/util/SplicingIdGenerator.java [32:41]:
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    public static SplicingIdGenerator instance() {
        if (instance == null) {
            synchronized (SplicingIdGenerator.class) {
                if (instance == null) {
                    instance = new SplicingIdGenerator();
                }
            }
        }
        return instance;
    }
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hugegraph-client/src/main/java/org/apache/hugegraph/util/SplicingIdGenerator.java [30:39]:
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    public static SplicingIdGenerator instance() {
        if (instance == null) {
            synchronized (SplicingIdGenerator.class) {
                if (instance == null) {
                    instance = new SplicingIdGenerator();
                }
            }
        }
        return instance;
    }
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