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package com.github.jodersky.flow
package internal
import java.io.{ File, FileOutputStream, InputStream, OutputStream }
/** Handles loading of the current platform's native library for flow. */
object NativeLoader {
private final val BufferSize = 4096
private def os = System.getProperty("os.name").toLowerCase.replaceAll("\\s", "")
private def arch = System.getProperty("os.arch").toLowerCase
/** Extract a resource from this class loader to a temporary file. */
private def extract(path: String, prefix: String): Option[File] = {
var in: Option[InputStream] = None
var out: Option[OutputStream] = None
try {
in = Option(NativeLoader.getClass.getResourceAsStream(path))
if (in.isEmpty) return None
val file = File.createTempFile(prefix, "")
out = Some(new FileOutputStream(file))
val buffer = new Array[Byte](BufferSize)
var length = -1;
do {
length = in.get.read(buffer)
if (length != -1) out.get.write(buffer, 0, length)
} while (length != -1)
Some(file)
} finally {
in.foreach(_.close)
out.foreach(_.close)
}
}
private def loadFromJar(library: String) = {
val fqlib = System.mapLibraryName(library) //fully qualified library name
val path = s"/native/${os}-${arch}/${fqlib}"
extract(path, fqlib) match {
case Some(file) => System.load(file.getAbsolutePath)
case None => throw new UnsatisfiedLinkError("Cannot extract flow's native library, " +
"the native library does not exist for your specific architecture/OS combination." +
"Could not find " + path + ".")
}
}
def load(library: String) = try {
System.loadLibrary(library)
} catch {
case ex: UnsatisfiedLinkError => loadFromJar(library)
}
}
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