org.apache.activemq.leveldb.util.FileSupport.scala Maven / Gradle / Ivy
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.leveldb.util
import java.io._
import org.fusesource.hawtdispatch._
import org.apache.activemq.leveldb.LevelDBClient
import org.fusesource.leveldbjni.internal.Util
import org.apache.activemq.leveldb.util.ProcessSupport._
import java.util.zip.CRC32
object FileSupport {
implicit def toRichFile(file:File):RichFile = new RichFile(file)
val onWindows = System.getProperty("os.name").toLowerCase().startsWith("windows")
private var linkStrategy = 0
private val LOG = Log(getClass)
def link(source:File, target:File):Unit = {
linkStrategy match {
case 0 =>
// We first try to link via a native system call. Fails if
// we cannot load the JNI module.
try {
Util.link(source, target)
} catch {
case e:IOException => throw e
case e:Throwable =>
// Fallback.. to a slower impl..
LOG.debug("Native link system call not available")
linkStrategy = 5
link(source, target)
}
// TODO: consider implementing a case which does the native system call using JNA
case 5 =>
// Next we try to do the link by executing an
// operating system shell command
try {
if( onWindows ) {
system("fsutil", "hardlink", "create", target.getCanonicalPath, source.getCanonicalPath) match {
case(0, _, _) => // Success
case (_, out, err) =>
// TODO: we might want to look at the out/err to see why it failed
// to avoid falling back to the slower strategy.
LOG.debug("fsutil OS command not available either")
linkStrategy = 10
link(source, target)
}
} else {
system("ln", source.getCanonicalPath, target.getCanonicalPath) match {
case(0, _, _) => // Success
case (_, out, err) => None
// TODO: we might want to look at the out/err to see why it failed
// to avoid falling back to the slower strategy.
LOG.debug("ln OS command not available either")
linkStrategy = 2
link(source, target)
}
}
} catch {
case e:Throwable =>
}
case _ =>
// this final strategy is slow but sure to work.
source.copyTo(target)
}
}
def systemDir(name:String) = {
val baseValue = System.getProperty(name)
if( baseValue==null ) {
sys.error("The the %s system property is not set.".format(name))
}
val file = new File(baseValue)
if( !file.isDirectory ) {
sys.error("The the %s system property is not set to valid directory path %s".format(name, baseValue))
}
file
}
case class RichFile(self:File) {
def / (path:String) = new File(self, path)
def linkTo(target:File) = link(self, target)
def copyTo(target:File) = {
using(new FileOutputStream(target)){ os=>
using(new FileInputStream(self)){ is=>
FileSupport.copy(is, os)
}
}
}
def crc32(limit:Long=Long.MaxValue) = {
val checksum = new CRC32();
var remaining = limit;
using(new FileInputStream(self)) { in =>
val data = new Array[Byte](1024*4)
var count = in.read(data, 0, remaining.min(data.length).toInt)
while( count > 0 ) {
remaining -= count
checksum.update(data, 0, count);
count = in.read(data, 0, remaining.min(data.length).toInt)
}
}
checksum.getValue()
}
def cached_crc32 = {
val crc32_file = new File(self.getParentFile, self.getName+".crc32")
if( crc32_file.exists() && crc32_file.lastModified() > self.lastModified() ) {
crc32_file.readText().trim.toLong
} else {
val rc = crc32()
crc32_file.writeText(rc.toString)
rc
}
}
def list_files:Array[File] = {
Option(self.listFiles()).getOrElse(Array())
}
def recursiveList:List[File] = {
if( self.isDirectory ) {
self :: self.listFiles.toList.flatten( _.recursiveList )
} else {
self :: Nil
}
}
def recursiveDelete: Unit = {
if( self.exists ) {
if( self.isDirectory ) {
self.listFiles.foreach(_.recursiveDelete)
}
self.delete
}
}
def recursiveCopyTo(target: File) : Unit = {
if (self.isDirectory) {
target.mkdirs
self.listFiles.foreach( file=> file.recursiveCopyTo( target / file.getName) )
} else {
self.copyTo(target)
}
}
def readText(charset:String="UTF-8"): String = {
using(new FileInputStream(self)) { in =>
FileSupport.readText(in, charset)
}
}
def readBytes: Array[Byte] = {
using(new FileInputStream(self)) { in =>
FileSupport.readBytes(in)
}
}
def writeBytes(data:Array[Byte]):Unit = {
using(new FileOutputStream(self)) { out =>
FileSupport.writeBytes(out, data)
}
}
def writeText(data:String, charset:String="UTF-8"):Unit = {
using(new FileOutputStream(self)) { out =>
FileSupport.writeText(out, data, charset)
}
}
}
/**
* Returns the number of bytes copied.
*/
def copy(in: InputStream, out: OutputStream): Long = {
var bytesCopied: Long = 0
val buffer = new Array[Byte](8192)
var bytes = in.read(buffer)
while (bytes >= 0) {
out.write(buffer, 0, bytes)
bytesCopied += bytes
bytes = in.read(buffer)
}
bytesCopied
}
def using[R,C <: Closeable](closable: C)(proc: C=>R) = {
try {
proc(closable)
} finally {
try { closable.close } catch { case ignore:Throwable => }
}
}
def readText(in: InputStream, charset:String="UTF-8"): String = {
new String(readBytes(in), charset)
}
def readBytes(in: InputStream): Array[Byte] = {
val out = new ByteArrayOutputStream()
copy(in, out)
out.toByteArray
}
def writeText(out: OutputStream, value: String, charset:String="UTF-8"): Unit = {
writeBytes(out, value.getBytes(charset))
}
def writeBytes(out: OutputStream, data: Array[Byte]): Unit = {
copy(new ByteArrayInputStream(data), out)
}
}
object ProcessSupport {
import FileSupport._
implicit def toRichProcessBuilder(self:ProcessBuilder):RichProcessBuilder = new RichProcessBuilder(self)
case class RichProcessBuilder(self:ProcessBuilder) {
def start(out:OutputStream=null, err:OutputStream=null, in:InputStream=null) = {
self.redirectErrorStream(out == err)
val process = self.start
if( in!=null ) {
LevelDBClient.THREAD_POOL {
try {
using(process.getOutputStream) { out =>
FileSupport.copy(in, out)
}
} catch {
case _ : Throwable =>
}
}
} else {
process.getOutputStream.close
}
if( out!=null ) {
LevelDBClient.THREAD_POOL {
try {
using(process.getInputStream) { in =>
FileSupport.copy(in, out)
}
} catch {
case _ : Throwable =>
}
}
} else {
process.getInputStream.close
}
if( err!=null && err!=out ) {
LevelDBClient.THREAD_POOL {
try {
using(process.getErrorStream) { in =>
FileSupport.copy(in, err)
}
} catch {
case _ : Throwable =>
}
}
} else {
process.getErrorStream.close
}
process
}
}
implicit def toRichProcess(self:Process):RichProcess = new RichProcess(self)
case class RichProcess(self:Process) {
def onExit(func: (Int)=>Unit) = LevelDBClient.THREAD_POOL {
self.waitFor
func(self.exitValue)
}
}
implicit def toProcessBuilder(args:Seq[String]):ProcessBuilder = new ProcessBuilder().command(args : _*)
def launch(command:String*)(func: (Int, Array[Byte], Array[Byte])=>Unit ):Unit = launch(command)(func)
def launch(p:ProcessBuilder, in:InputStream=null)(func: (Int, Array[Byte], Array[Byte]) => Unit):Unit = {
val out = new ByteArrayOutputStream
val err = new ByteArrayOutputStream
p.start(out, err, in).onExit { code=>
func(code, out.toByteArray, err.toByteArray)
}
}
def system(command:String*):(Int, Array[Byte], Array[Byte]) = system(command)
def system(p:ProcessBuilder, in:InputStream=null):(Int, Array[Byte], Array[Byte]) = {
val out = new ByteArrayOutputStream
val err = new ByteArrayOutputStream
val process = p.start(out, err, in)
process.waitFor
(process.exitValue, out.toByteArray, err.toByteArray)
}
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