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defer opening logging output files until an actual write

This commit is contained in:
Mark Harrah 2012-08-21 12:26:11 -04:00
parent cbaa805511
commit 29dd76da85
2 changed files with 30 additions and 1 deletions
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2
tasks/standard/Streams.scala
View File

@ -77,7 +77,7 @@ object Streams
make(a, sid)(f => new BufferedInputStream(new FileInputStream(f)))
def text(sid: String = default): PrintWriter =
make(a, sid)(f => new PrintWriter(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(f), IO.defaultCharset))) )
make(a, sid)(f => new PrintWriter(new DeferredWriter(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(f), IO.defaultCharset)))) )
def binary(sid: String = default): BufferedOutputStream =
make(a, sid)(f => new BufferedOutputStream(new FileOutputStream(f)))

29
util/io/DeferredWriter.scala Normal file
View File

@ -0,0 +1,29 @@
package sbt
import java.io.Writer
final class DeferredWriter(make: => Writer) extends Writer
{
private[this] var opened = false
private[this] var delegate0: Writer = _
private[this] def delegate: Writer = synchronized {
if(delegate0 eq null) {
delegate0 = make
opened = true
}
delegate0
}
override def close() = synchronized {
if(opened) delegate0.close()
}
override def append(c: Char): Writer = delegate.append(c)
override def append(csq: CharSequence): Writer = delegate.append(csq)
override def append(csq: CharSequence, start: Int, end: Int): Writer = delegate.append(csq, start, end)
override def flush() = delegate.flush()
override def write(cbuf: Array[Char]) = delegate.write(cbuf)
override def write(cbuf: Array[Char], off: Int, len: Int): Unit = delegate.write(cbuf, off, len)
override def write(c: Int): Unit = delegate.write(c)
override def write(s: String): Unit = delegate.write(s)
override def write(s: String, off: Int, len: Int): Unit = delegate.write(s, off, len)
}