Provide a configurable utility class to create image output streams wrapping
OutputStream
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Key: GEOT-3559
URL: http://jira.codehaus.org/browse/GEOT-3559
Project: GeoTools
Issue Type: Bug
Affects Versions: 2.7.0
Reporter: Andrea Aime
Assignee: Andrea Aime
Fix For: 2.7.1
The current code writing out images via ImageIO on top of output streams builds
a wrapper around the output streams that allows for random access, either a
MemoryCacheOutputStream or a FileCacheOutputStream.
The first caches the data in memory before writing, it's fast but does not
scale up. Suitable for small images.
The second caches the data on the file system, it's slow but scales up to the
available disk space. Suitable for large images.
Unfortunately ImageIO only allows to decide up front whether to use file or
disk cache, whilst the decision should be taken on a case by case depending on
the size of the image to be encoded.
It would be possible to add a new ImageOutputStream SPI generating a wrapper
that is "smart" and first goes memory and then disk, however that would mean
rewriting in one the MemoryCacheOutputStream and FileCacheOutputStream code
(1000loc worth of code) and would not work in modern Tomcat out of the box, all
reader spi are scrubbed on startup unfortunately (to prevent permgen leaks on
webapp undeploy).
What we want to do is to create a ImageIOExt class that can take both the image
and the destination and decide whether to emit a memory or a file cache output
stream based on a configurable threshold instead.
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