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| © Copyright 2011 Contributors. |
| All rights reserved. |
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| |
| <h1>AspectJ 1.7.0 Readme</h1> |
| |
| <p>The full list of resolved issues in 1.7.0 is available |
| <a href="https://bugs.eclipse.org/bugs/buglist.cgi?query_format=advanced;bug_status=RESOLVED;bug_status=VERIFIED;bug_status=CLOSED;product=AspectJ;target_milestone=1.7.0;">here</a></h2>.</p> |
| |
| <ul> |
| <li>1.7.0 available 2-Jul-2012 |
| <li>1.7.0.RC1 available 25-May-2012 |
| <li>1.7.0.M1 available 16-Dec-2011 |
| </ul> |
| |
| <h2>Notable Changes</h2> |
| |
| <h3>Java 7 bytecode weaving</h3> |
| <p>The first milestone of 1.7.0 upgraded the compiler but this still left the weaver with some issues |
| if it had to weave into bytecode containing some of the new features that were allowed by Java 1.7. |
| In particular this meant any bytecode containing the INVOKEDYNAMIC (new instruction for 1.7) and |
| the related new constant pool entry types that support it. RC1 now supports weaving into bytecode |
| containing these features. However, the new INVOKEDYNAMIC instruction does not surface as a join |
| point yet so you cannot write a pointcut to match on it. If you use execution() pointcuts |
| as opposed to call() then you will still be able to advise what the invokedynamic actually calls. |
| </p> |
| <h3>Bytecode caching for loadtime weaving</h3> |
| <p>Under <a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=367673">bug 367673</a> we have had |
| a contribution (thanks John Kew!) that enables a bytecode cache for loadtime weaving. The |
| details and some rudimentary benchmark numbers are in the bug. Basically it caches woven |
| bytecode on first start of a system |
| using LTW and then reuses that woven bytecode on subsequent starts - this saves weaving time |
| and also memory consumption. To activate it, use the following system properties:</p> |
| <pre><code>-Daj.weaving.cache.enabled=true |
| -Daj.weaving.cache.dir=/tmp/aspectj-cache/ |
| </code></pre> |
| |
| <h3>Upgrade to Java 7</h3> |
| <p> |
| For AspectJ 1.7.0, AspectJ moved from Eclipse JDT Core 0.785_R33x (Eclipse 3.3) to Eclipse JDT Core 0.B79_R37x (Eclipse 3.7). |
| This is a big change where AspectJ is picking up four years of change from the Eclipse compiler. |
| </p> |
| <p> |
| It means that you can now use the new Java 7 language constructs in your programs:</p> |
| <p> |
| - Diamond operator in advice: |
| <code><pre> |
| aspect Foo { |
| before(): execution(* *(..)) { |
| List<String> ls = new ArrayList<>(); |
| } |
| } |
| </pre></code> |
| <p> |
| - Diamond operator in ITD: |
| <code><pre> |
| public List<String> DiamondITD.ls = new ArrayList<>(); |
| </pre></code> |
| <p> |
| - Underscore literals and binary literals in advice: |
| <code><pre> |
| before(): execution(* *(..)) { |
| int onemill = 1_000_000; |
| int four =0b100; |
| } |
| </pre></code> |
| <p> |
| - Multi-catch:<code><pre> |
| before(): execution(* main(..)) { |
| try { |
| foo("abc"); |
| } catch (ExceptionA | ExceptionB ex) { |
| bar(ex); |
| } |
| } |
| </pre></code> |
| <p> |
| - String switch:<code><pre> |
| before(String s): execution(* *(..)) && args(s) { |
| switch(s) { |
| case "quux": |
| foo(); |
| break; |
| case "bar": |
| foo(); |
| break; |
| default: |
| foo(); |
| break; |
| } |
| } |
| </pre></code> |
| <p> |
| - Try with resources:<code><pre> |
| try ( |
| InputStream in = new FileInputStream(src); |
| OutputStream out = new FileOutputStream(dest)) |
| { |
| // code |
| } |
| </pre></code> |
| </p> |
| <h4> |
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