mirrors/PMTiles
1
0
Fork 0
mirror of https://github.com/protomaps/PMTiles.git synced 2026-02-04 10:51:07 +00:00
Code Issues Packages Projects Releases Wiki Activity

implement LRU cache

Browse Source
This commit is contained in:
Brandon Liu
2021-02-18 19:46:27 +08:00
parent 0c55b7e115
commit 01602c6846
1 changed files with 18 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
js/pmtiles.js
View File

@@ -57,7 +57,7 @@
})
}
})
// TODO make this LRU
this.step = 0
this.leaves = new Map()
this.outstanding_requests = new Map()
}
@@ -65,7 +65,8 @@
getLeaf = (offset, len) => {
return new Promise((resolve,reject) => {
if (this.leaves.has(offset)) {
resolve(this.leaves.get(offset))
this.leaves.get(offset)[0]++
resolve(this.leaves.get(offset)[1])
} else if (this.outstanding_requests.has(offset)) {
this.outstanding_requests.get(offset).push(resolve)
} else {
@@ -74,12 +75,22 @@
return resp.arrayBuffer()
}).then(buf => {
var map = bytesToMap(new DataView(buf),len/17)
this.leaves.set(offset,map)
resolve(map)
this.outstanding_requests.get(offset).forEach(f => {
f(map)
if (this.leaves.size > 32) {
var minStep = Infinity
var minKey = undefined
this.leaves.forEach((val,key) => {
if (val[0] < minStep) {
minStep = val[0]
minKey = key
}
})
console.log("leaves: ", this.leaves.size)
this.leaves.delete(minKey)
}
this.leaves.set(offset,[this.step++,map])
resolve(map)
this.outstanding_requests.get(offset).forEach(f => f(map))
this.outstanding_requests.delete(offset)
})
}
})