framework/src/main/java/org/apache/felix/framework/ServiceRegistrationImpl.java [663:700]:
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        public int compareTo(Object reference)
        {
            ServiceReference other = (ServiceReference) reference;

            Long id = (Long) getProperty(Constants.SERVICE_ID);
            Long otherId = (Long) other.getProperty(Constants.SERVICE_ID);

            if (id.equals(otherId))
            {
                return 0; // same service
            }

            Object rankObj = getProperty(Constants.SERVICE_RANKING);
            Object otherRankObj = other.getProperty(Constants.SERVICE_RANKING);

            // If no rank, then spec says it defaults to zero.
            rankObj = (rankObj == null) ? new Integer(0) : rankObj;
            otherRankObj = (otherRankObj == null) ? new Integer(0) : otherRankObj;

            // If rank is not Integer, then spec says it defaults to zero.
            Integer rank = (rankObj instanceof Integer)
                ? (Integer) rankObj : new Integer(0);
            Integer otherRank = (otherRankObj instanceof Integer)
                ? (Integer) otherRankObj : new Integer(0);

            // Sort by rank in ascending order.
            if (rank.compareTo(otherRank) < 0)
            {
                return -1; // lower rank
            }
            else if (rank.compareTo(otherRank) > 0)
            {
                return 1; // higher rank
            }

            // If ranks are equal, then sort by service id in descending order.
            return (id.compareTo(otherId) < 0) ? 1 : -1;
        }
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connect/src/main/java/org/apache/felix/connect/felix/framework/ServiceRegistrationImpl.java [466:503]:
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        public int compareTo(Object reference)
        {
            ServiceReference other = (ServiceReference) reference;

            Long id = (Long) getProperty(Constants.SERVICE_ID);
            Long otherId = (Long) other.getProperty(Constants.SERVICE_ID);

            if (id.equals(otherId))
            {
                return 0; // same service
            }

            Object rankObj = getProperty(Constants.SERVICE_RANKING);
            Object otherRankObj = other.getProperty(Constants.SERVICE_RANKING);

            // If no rank, then spec says it defaults to zero.
            rankObj = (rankObj == null) ? new Integer(0) : rankObj;
            otherRankObj = (otherRankObj == null) ? new Integer(0) : otherRankObj;

            // If rank is not Integer, then spec says it defaults to zero.
            Integer rank = (rankObj instanceof Integer)
                ? (Integer) rankObj : new Integer(0);
            Integer otherRank = (otherRankObj instanceof Integer)
                ? (Integer) otherRankObj : new Integer(0);

            // Sort by rank in ascending order.
            if (rank.compareTo(otherRank) < 0)
            {
                return -1; // lower rank
            }
            else if (rank.compareTo(otherRank) > 0)
            {
                return 1; // higher rank
            }

            // If ranks are equal, then sort by service id in descending order.
            return (id.compareTo(otherId) < 0) ? 1 : -1;
        }
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