org.jetbrains.kotlin.cli.jvm.compiler.jarfs.FastJarFileSystem.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
* Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
*/
package org.jetbrains.kotlin.cli.jvm.compiler.jarfs
import com.intellij.openapi.util.Couple
import com.intellij.openapi.vfs.DeprecatedVirtualFileSystem
import com.intellij.openapi.vfs.StandardFileSystems
import com.intellij.openapi.vfs.VirtualFile
import com.intellij.util.containers.ConcurrentFactoryMap
import com.intellij.util.io.FileAccessorCache
import java.io.File
import java.io.IOException
import java.io.RandomAccessFile
import java.nio.ByteBuffer
import java.nio.MappedByteBuffer
import java.nio.channels.FileChannel
private typealias RandomAccessFileAndBuffer = Pair
class FastJarFileSystem private constructor(internal val unmapBuffer: MappedByteBuffer.() -> Unit) : DeprecatedVirtualFileSystem() {
private val myHandlers: MutableMap =
ConcurrentFactoryMap.createMap { key: String -> FastJarHandler(this@FastJarFileSystem, key) }
internal val cachedOpenFileHandles: FileAccessorCache =
object : FileAccessorCache(20, 10) {
@Throws(IOException::class)
override fun createAccessor(file: File): RandomAccessFileAndBuffer {
val randomAccessFile = RandomAccessFile(file, "r")
return Pair(randomAccessFile, randomAccessFile.channel.map(FileChannel.MapMode.READ_ONLY, 0, randomAccessFile.length()))
}
@Throws(IOException::class)
override fun disposeAccessor(fileAccessor: RandomAccessFileAndBuffer) {
fileAccessor.first.close()
fileAccessor.second.unmapBuffer()
}
override fun isEqual(val1: File, val2: File): Boolean {
return val1 == val2 // reference equality to handle different jars for different ZipHandlers on the same path
}
}
override fun getProtocol(): String {
return StandardFileSystems.JAR_PROTOCOL
}
override fun findFileByPath(path: String): VirtualFile? {
val pair = splitPath(path)
return myHandlers[pair.first]!!.findFileByPath(pair.second)
}
override fun refresh(asynchronous: Boolean) {}
override fun refreshAndFindFileByPath(path: String): VirtualFile? {
return findFileByPath(path)
}
fun clearHandlersCache() {
myHandlers.clear()
cachedOpenFileHandles.clear()
}
companion object {
fun splitPath(path: String): Couple {
val separator = path.indexOf("!/")
require(separator >= 0) { "Path in JarFileSystem must contain a separator: $path" }
val localPath = path.substring(0, separator)
val pathInJar = path.substring(separator + 2)
return Couple.of(localPath, pathInJar)
}
fun createIfUnmappingPossible(): FastJarFileSystem? {
val cleanerCallBack = prepareCleanerCallback() ?: return null
return FastJarFileSystem(cleanerCallBack)
}
}
}
private val IS_PRIOR_9_JRE = System.getProperty("java.specification.version", "").startsWith("1.")
private fun prepareCleanerCallback(): ((ByteBuffer) -> Unit)? {
return try {
if (IS_PRIOR_9_JRE) {
val cleaner = Class.forName("java.nio.DirectByteBuffer").getMethod("cleaner")
cleaner.isAccessible = true
val clean = Class.forName("sun.misc.Cleaner").getMethod("clean")
clean.isAccessible = true
{ buffer: ByteBuffer -> clean.invoke(cleaner.invoke(buffer)) }
} else {
val unsafeClass = try {
Class.forName("sun.misc.Unsafe")
} catch (ex: Exception) {
// jdk.internal.misc.Unsafe doesn't yet have an invokeCleaner() method,
// but that method should be added if sun.misc.Unsafe is removed.
Class.forName("jdk.internal.misc.Unsafe")
}
val clean = unsafeClass.getMethod("invokeCleaner", ByteBuffer::class.java)
clean.isAccessible = true
val theUnsafeField = unsafeClass.getDeclaredField("theUnsafe")
theUnsafeField.isAccessible = true
val theUnsafe = theUnsafeField.get(null);
{ buffer: ByteBuffer -> clean.invoke(theUnsafe, buffer) }
}
} catch (ex: Exception) {
null
}
}