Welcome to... "Micro-Lesson 239"
The arpeggio melody in this run is primarily focused upon our tonic chord of, "D Major 7th." In measure one we find the run begin from the 5th string at the 5th fret "D." The pattern is centered between the 5th through 3rd strings and completes the initial passage into the 9th chord tone of "E."
In measure two we start off across the same Major 7th pattern once more, however this run completes it's phrasing up to the higher octave of the 9th at 2nd string 5th fret "E."
Measure three plays through a passage that exists mainly from our second chord of the key which is the, "Em7." This chord has it's arpeggio tones mixed against the scale tones of the underlying key, (D Major Scale).
Up till this point all of the measures have shared the same rhythmic content, but in measure four we wrap up with chord punches off of the root and the 3rd chord tones of the keys I, IV and V chords, (D, G and A major). The ending is performed as a syncopated double-stop phrase and really solidifies the tonality of the key we're in.
Take your time with this run and build speed slowly only after the phrase is committed to memory. Enjoy!
Micro Lesson 239: "D Major" 7th Arpeggio Run