1 package net.pterodactylus.sone.core
3 import com.google.common.base.Ticker
4 import com.google.common.cache.CacheBuilder
5 import freenet.keys.FreenetURI
6 import java.io.ByteArrayInputStream
7 import java.net.URLDecoder
8 import java.text.Normalizer
9 import java.util.concurrent.TimeUnit.MINUTES
10 import javax.imageio.ImageIO
11 import javax.inject.Inject
14 * [ElementLoader] implementation that uses a simple Guava [com.google.common.cache.Cache].
16 class DefaultElementLoader(private val freenetInterface: FreenetInterface, ticker: Ticker) : ElementLoader {
18 @Inject constructor(freenetInterface: FreenetInterface) : this(freenetInterface, Ticker.systemTicker())
20 private val loadingLinks = CacheBuilder.newBuilder().build<String, Boolean>()
21 private val failureCache = CacheBuilder.newBuilder().ticker(ticker).expireAfterWrite(30, MINUTES).build<String, Boolean>()
22 private val imageCache = CacheBuilder.newBuilder().build<String, LinkedElement>()
23 private val callback = object : FreenetInterface.BackgroundFetchCallback {
24 override fun cancelForMimeType(uri: FreenetURI, mimeType: String): Boolean {
25 println("Got MIME Type “$mimeType” for $uri.")
26 return !mimeType.startsWith("image/")
29 override fun loaded(uri: FreenetURI, mimeType: String, data: ByteArray) {
30 println("Got ${data.size} Bytes with MIME Type $mimeType for $uri.")
31 if (!mimeType.startsWith("image/")) {
34 ByteArrayInputStream(data).use {
37 println("Successfully parsed images from $uri.")
38 imageCache.get(uri.toString().decode().normalize()) { LinkedElement(uri.toString()) }
40 removeLoadingLink(uri)
43 override fun failed(uri: FreenetURI) {
44 println("Failed to load $uri.")
45 failureCache.put(uri.toString().decode().normalize(), true)
46 removeLoadingLink(uri)
49 private fun removeLoadingLink(uri: FreenetURI) {
50 println("Not loading anymore: $uri.")
51 synchronized(loadingLinks) {
52 loadingLinks.invalidate(uri.toString().decode().normalize())
57 override fun loadElement(link: String): LinkedElement {
58 val normalizedLink = link.decode().normalize()
59 println("Checking for $normalizedLink...")
60 synchronized(loadingLinks) {
61 imageCache.getIfPresent(normalizedLink)?.run {
62 println("In the Image Cache: $normalizedLink")
65 failureCache.getIfPresent(normalizedLink)?.run {
66 println("In the Failure Cache: $normalizedLink")
67 return LinkedElement(link, failed = true)
69 if (loadingLinks.getIfPresent(normalizedLink) == null) {
70 println("Not loading: $normalizedLink")
71 loadingLinks.put(normalizedLink, true)
72 freenetInterface.startFetch(FreenetURI(link), callback)
75 println("Returning loading element: $normalizedLink")
76 return LinkedElement(link, loading = true)
79 private fun String.decode() = URLDecoder.decode(this, "UTF-8")
80 private fun String.normalize() = Normalizer.normalize(this, Normalizer.Form.NFC)