How does the dispose() function work in lru-cache exactly?
QUESTION:
From my understanding, dispose is called every time the cache is out of space and will delete a specific item of the cache (see reference).
What I find extremely strange is that although there is clearly enough space in the cache (only testing with a few small objects), many items seem to be called by dispose. What is even stranger is that when I reload my page, the items have not been deleted: they are still in the cache and apparently properly retrieved.
I must misunderstand what dispose does. What does dispose actually do ?
REFERENCE:
https://www.npmjs.com/package/lru-cache#options
dispose Function that is called on items when they are dropped from the cache. This can be handy if you want to close file descriptors or do other cleanup tasks when items are no longer accessible. Called with key, value. It's called before actually removing the item from the internal cache, so if you want to immediately put it back in, you'll have to do that in a nextTick or setTimeout callback or it won't do anything.
CODE:
options = { max: 1000000000
, length: function (n, key) { return (sizeof(n)+sizeof(key)) }
, dispose: function (key, n) { console.log("DELETED: "+key) }
, maxAge: 1000 * 60 * 60 };
global.myCache = LRU(options);
javascript node.js caching lru
asked Nov 12 at 11:34
TheProgrammer
313119
add a comment |
QUESTION:
From my understanding, dispose is called every time the cache is out of space and will delete a specific item of the cache (see reference).
What I find extremely strange is that although there is clearly enough space in the cache (only testing with a few small objects), many items seem to be called by dispose. What is even stranger is that when I reload my page, the items have not been deleted: they are still in the cache and apparently properly retrieved.
I must misunderstand what dispose does. What does dispose actually do ?
REFERENCE:
https://www.npmjs.com/package/lru-cache#options
dispose Function that is called on items when they are dropped from the cache. This can be handy if you want to close file descriptors or do other cleanup tasks when items are no longer accessible. Called with key, value. It's called before actually removing the item from the internal cache, so if you want to immediately put it back in, you'll have to do that in a nextTick or setTimeout callback or it won't do anything.
CODE:
options = { max: 1000000000
, length: function (n, key) { return (sizeof(n)+sizeof(key)) }
, dispose: function (key, n) { console.log("DELETED: "+key) }
, maxAge: 1000 * 60 * 60 };
global.myCache = LRU(options);
javascript node.js caching lru
asked Nov 12 at 11:34
TheProgrammer
313119
add a comment |
QUESTION:
From my understanding, dispose is called every time the cache is out of space and will delete a specific item of the cache (see reference).
What I find extremely strange is that although there is clearly enough space in the cache (only testing with a few small objects), many items seem to be called by dispose. What is even stranger is that when I reload my page, the items have not been deleted: they are still in the cache and apparently properly retrieved.
I must misunderstand what dispose does. What does dispose actually do ?
REFERENCE:
https://www.npmjs.com/package/lru-cache#options
dispose Function that is called on items when they are dropped from the cache. This can be handy if you want to close file descriptors or do other cleanup tasks when items are no longer accessible. Called with key, value. It's called before actually removing the item from the internal cache, so if you want to immediately put it back in, you'll have to do that in a nextTick or setTimeout callback or it won't do anything.
CODE:
options = { max: 1000000000
, length: function (n, key) { return (sizeof(n)+sizeof(key)) }
, dispose: function (key, n) { console.log("DELETED: "+key) }
, maxAge: 1000 * 60 * 60 };
global.myCache = LRU(options);
javascript node.js caching lru
asked Nov 12 at 11:34
TheProgrammer
313119
QUESTION:
From my understanding, dispose is called every time the cache is out of space and will delete a specific item of the cache (see reference).
What I find extremely strange is that although there is clearly enough space in the cache (only testing with a few small objects), many items seem to be called by dispose. What is even stranger is that when I reload my page, the items have not been deleted: they are still in the cache and apparently properly retrieved.
I must misunderstand what dispose does. What does dispose actually do ?
REFERENCE:
https://www.npmjs.com/package/lru-cache#options
dispose Function that is called on items when they are dropped from the cache. This can be handy if you want to close file descriptors or do other cleanup tasks when items are no longer accessible. Called with key, value. It's called before actually removing the item from the internal cache, so if you want to immediately put it back in, you'll have to do that in a nextTick or setTimeout callback or it won't do anything.
CODE:
options = { max: 1000000000
, length: function (n, key) { return (sizeof(n)+sizeof(key)) }
, dispose: function (key, n) { console.log("DELETED: "+key) }
, maxAge: 1000 * 60 * 60 };
global.myCache = LRU(options);
javascript node.js caching lru
javascript node.js caching lru
asked Nov 12 at 11:34
TheProgrammer
313119
asked Nov 12 at 11:34
TheProgrammer
313119
asked Nov 12 at 11:34
TheProgrammer
313119
asked Nov 12 at 11:34
TheProgrammer
313119
asked Nov 12 at 11:34
TheProgrammer
313119
313119
add a comment |
add a comment |
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