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public interface Loader
A loader that could load a resource to another format.
It is mainly designed to work with ResourceCache
.
Nested Class Summary | |
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static class |
Loader.Resource
Represents the more information about an object loaded by load(java.lang.Object) . |
Method Summary | |
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long |
getLastModified(java.lang.Object src)
Returns the last modified time, or -1 if reload is required or not exists. |
java.lang.Object |
load(java.lang.Object src)
Loads the resource. |
boolean |
shallCheck(java.lang.Object src,
long expiredMillis)
Returns whether to call getLastModified(java.lang.Object) . |
Method Detail |
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boolean shallCheck(java.lang.Object src, long expiredMillis)
getLastModified(java.lang.Object)
.
If false, it assumes the current cached content is up-to-date.
expiredMillis
- how many milli-seconds are expired after the last
check. In most cases, just return true if expiredMillis > 0long getLastModified(java.lang.Object src)
java.lang.Object load(java.lang.Object src) throws java.lang.Exception
The returned resource could be anything. It will be returned
by ResourceCache.get(java.lang.Object)
.
However, if you want to have more control (e.g., whether to cache),
you can return an instance
of Loader.Resource
. Then, the return value of ResourceCache.get(java.lang.Object)
will be Loader.Resource.resource
.
java.lang.Exception
- you might throw any exception which will be
passed back to the caller of ResourceCache.get(java.lang.Object)
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