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copied!<p>Daniel,</p> <p>I've just recently deployed the scala-arm library for automatic resource management. You can find the documentation here: <a href="http://wiki.github.com/jsuereth/scala-arm/" rel="noreferrer">http://wiki.github.com/jsuereth/scala-arm/</a></p> <p>This library supports three styles of usage (currently):</p> <p>1) Imperative/for-expression:</p> <pre><code>import resource._ for(input <- managed(new FileInputStream("test.txt")) { // Code that uses the input as a FileInputStream } </code></pre> <p>2) Monadic-style</p> <pre><code>import resource._ import java.io._ val lines = for { input <- managed(new FileInputStream("test.txt")) val bufferedReader = new BufferedReader(new InputStreamReader(input)) line <- makeBufferedReaderLineIterator(bufferedReader) } yield line.trim() lines foreach println </code></pre> <p>3) Delimited Continuations-style</p> <p>Here's an "echo" tcp server:</p> <pre><code>import java.io._ import util.continuations._ import resource._ def each_line_from(r : BufferedReader) : String @suspendable = shift { k => var line = r.readLine while(line != null) { k(line) line = r.readLine } } reset { val server = managed(new ServerSocket(8007)) ! while(true) { // This reset is not needed, however the below denotes a "flow" of execution that can be deferred. // One can envision an asynchronous execuction model that would support the exact same semantics as below. reset { val connection = managed(server.accept) ! val output = managed(connection.getOutputStream) ! val input = managed(connection.getInputStream) ! val writer = new PrintWriter(new BufferedWriter(new OutputStreamWriter(output))) val reader = new BufferedReader(new InputStreamReader(input)) writer.println(each_line_from(reader)) writer.flush() } } } </code></pre> <p>The code makes uses of a Resource type-trait, so it's able to adapt to most resource types. It has a fallback to use structural typing against classes with either a close or dispose method. Please check out the documentation and let me know if you think of any handy features to add.</p>

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