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In HEP we often
analyze events
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Events can be
large and involve many objects
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We do not care
about correlations between events
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at the end of
the event all of its objects can be discarded.
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Allocating many
objects and leaving the garbage collector to
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clean them up can
be expensive.
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Instead of using
the new operator
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Track
myTrack = new
Track();
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Use a Factory,
e.g.
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Track myTrack =
TrackFactory.createTrack();
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Implementation
of factory can be initially trivial
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Later on can be
optimized
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reuse tracks from
previous event
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Discard unused
tracks only when memory becomes tight
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