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make blobstore/list-blobs actually lazy

This commit is contained in:
Joost Diepenmaat 2011-03-15 15:31:21 +01:00
parent 94ac74d711
commit 5983eb0402
1 changed files with 8 additions and 1 deletions
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9
blobstore/src/main/clojure/org/jclouds/blobstore.clj
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@ -151,10 +151,17 @@ Options can also be specified for extension modules
(list-blobs-chunks container prefix blobstore (list-blobs-chunks container prefix blobstore
(.getNextMarker chunk))))))) (.getNextMarker chunk)))))))
(defn- concat-elements
"Make a lazy concatenation of the lazy sequences contained in coll. Lazily evaluates coll.
Note: (apply concat coll) or (lazy-cat coll) are not lazy wrt coll itself."
[coll]
(if-let [s (seq coll)]
(lazy-seq (concat (first s) (concat-elements (next s))))))
(defn list-blobs (defn list-blobs
"Returns a lazy seq of all blobs in the given container." "Returns a lazy seq of all blobs in the given container."
([container prefix #^BlobStore blobstore] ([container prefix #^BlobStore blobstore]
(apply concat (list-blobs-chunks container prefix blobstore :start)))) (concat-elements (list-blobs-chunks container prefix blobstore :start))))
(defn locations (defn locations
"Retrieve the available container locations for the blobstore context." "Retrieve the available container locations for the blobstore context."