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Added Cleanup features text.

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Reinier Zwitserloot
2009-07-18 00:25:09 +02:00
parent 97974b9104
commit efe46f68a9
4 changed files with 102 additions and 0 deletions
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build.xml
+3
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@@ -74,6 +74,9 @@
<antcall target="-integrateSnippet">
<param name="transformationName" value="Data" />
</antcall>
<antcall target="-integrateSnippet">
<param name="transformationName" value="Cleanup" />
</antcall>
<mkdir dir="dist" />
<tar destfile="dist/website.tar">
<tarfileset dir="build/website" />
usage_examples/CleanupExample_post.jpage
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@@ -0,0 +1,22 @@
import java.io.*;
public class CleanupExample {
public static void main(String[] args) throws IOException {
InputStream in = new FileInputStream(args[0]);
try {
OutputStream out = new FileOutputStream(args[1]);
try {
byte[] b = new byte[10000];
while (true) {
int r = in.read(b);
if (r == -1) break;
out.write(b, 0, r);
}
} finally {
out.close();
}
} finally {
in.close();
}
}
}
usage_examples/CleanupExample_pre.jpage
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@@ -0,0 +1,15 @@
import lombok.Cleanup;
import java.io.*;
public class CleanupExample {
public static void main(String[] args) throws IOException {
@Cleanup InputStream in = new FileInputStream(args[0]);
@Cleanup OutputStream out = new FileOutputStream(args[1]);
byte[] b = new byte[10000];
while (true) {
int r = in.read(b);
if (r == -1) break;
out.write(b, 0, r);
}
}
}
website/features/Cleanup.html
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@@ -0,0 +1,62 @@
<!DOCTYPE html>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="../logi/reset.css" />
<link rel="stylesheet" type="text/css" href="features.css" />
<link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
<meta name="description" content="Spice up your java" />
<title>@Cleanup</title>
<!--[if lt IE 7]><script type="text/javascript" src="logi/iepngfix_tilebg.js"></script><![endif]-->
</head><body><div id="pepper">
<div class="meat">
<div class="minimumHeight"></div>
<div class="header"><a href="../index.html">Project Lombok</a></div>
<h1>@Cleanup</h1>
<div class="overview">
<h3>Overview</h3>
<p>
You can use <code>@Cleanup</code> to ensure a given resource is automatically cleaned up before the code execution path exits your
current scope. You do this by annotating any local variable declaration with the <code>@Cleanup</code> annotation like so:<br />
<code>@Cleanup InputStream in = new FileInputStream("some/file");</code></br />
As a result, at the end of the scope you're in, <code>in.close()</code> is called. This call is guaranteed to run by way of a
try/finally construct. Look at the example below to see how this works.
</p><p>
If the type of object you'd like to cleanup does not have a <code>close()</code> method, but some other no-argument method, you can
specify the name of this method like so:<br />
<code>@Cleanup("dispose") org.eclipse.swt.widgets.CoolBar bar = new CoolBar(parent, 0);</code><br />
By default, the cleanup method is presumed to be <code>close()</code>. A cleanup method that takes argument cannot be called via
<code>@Cleanup</code>.
</p>
</div>
<div class="snippets">
<div class="pre">
<h3>With Lombok</h3>
<div class="snippet">@HTML_PRE@</div>
</div>
<div class="sep"></div>
<div class="post">
<h3>Vanilla Java</h3>
<div class="snippet">@HTML_POST@</div>
</div>
</div>
<div style="clear: left;"></div>
<div class="overview">
<h3>Small print</h3><div class="smallprint">
<p>
If your code throws an exception, and the cleanup method call that is then triggered also throws an exception, then the original exception
is hidden by the exception thrown by the cleanup call. You should <em>not</em> rely on this 'feature'. Preferably, lombok would like to generate
code so that, if the main body has thrown an exception, any exception thrown by the close call is silently swallowed (but if the main body
exited in any other way, exceptions by the close call will not be swallowed). The authors of lombok do not currently know of a feasible way
to implement this scheme, but if java updates allow it, or we find a way, we'll fix it.
</p><p>
You do still need to handle any exception that the cleanup method can generate!
</p>
</div>
</div>
<footer>
<a href="index.html">Back to features</a> | <a href="Data.html">Previous feature (@Data)</a> | <a href="Synchronized.html">Next feature (@Synchronized)</a><br />
<span class="copyright">Copyright &copy; 2009 Reinier Zwitserloot and Roel Spilker, licensed under the <a href="http://www.opensource.org/licenses/mit-license.php">MIT licence</a>.</span>
</footer>
<div style="clear: both;"></div>
</div>
</div></body></html>