@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        LinkData that = (LinkData) o;

        if (!fromApplication.equals(that.fromApplication)) return false;
        if (!toApplication.equals(that.toApplication)) return false;

        return true;
    }
@param hostname
           host name or endpoint
@param slot
@param count
web/src/main/java/com/navercorp/pinpoint/web/applicationmap/rawdata/LinkData.java