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+
+ <center><iframe src="http://www.apache.org/ads/buttonbar.html";
+ style="border-width:0;" frameborder="0" scrolling="no"
+ width="135" height="265"></iframe>
+ </center>
+
+ </div>
+
+ </td>
+
+ <td valign="top">
+ <div id="main">
+
+ <h1 class="title">Using namespaces</h1>
+ <br class="xooki-br"/>Now that you have seen how simple it is to
create your own repository from an existing one, you may wonder how you can
handle more complex cases, when the source and destination repositories don't
follow the same naming conventions for instance. <br class="xooki-br"/><br
class="xooki-br"/><br class="xooki-br"/><h1>On the road to a professional
repository</h1>
+We will study in this section how to build a <strong>professionnal</strong>
repository. What is a <strong>professionnal</strong> repository? Our vision is
to say that a good quality repository must follow clear rules about projects
naming and must offer corrects, usuables, configurables and verified project
descriptors. In order to achieve those goals, we think that you have to build
your own repository.<br class="xooki-br"/>We have seen in the previous example,
that we could use some public repositories to begin to build our own
repository. <br class="xooki-br"/>Nevertheless, the result is not always the
expected one, especially concerning the naming rules used. <br
class="xooki-br"/><br class="xooki-br"/>This problem is pretty usual when you
have an existing repository, and want to benefit from a large public
repositories which do not follow the same naming conventions. Or simply because
you find the public repository you use as a basis is not consistent enough -
why all a
pache commons module aren't don't use the org.apache.commons organization? For
historical reasons. But if you setup your own repository you may not want to
suffer from history.<br class="xooki-br"/><br class="xooki-br"/>Fortunately Ivy
has a very powerful answer to this kind of problem: <a
href="../../settings/namespaces.html">namespaces</a>.<br class="xooki-br"/><br
class="xooki-br"/><h1>Using namespaces</h1>
+If you look at the repository built with the <a
href="../../tutorial/build-repository/basic.html">previous tutorial</a>, you
will see exactly what we were talking about: all apache commons module use
their own name as organization.<br class="xooki-br"/><br class="xooki-br"/>So
let's see what Ivy can do using namespaces (we will dig into details later):
+<div class="shell"><pre>
+[...@apache:/ivy/build-a-ivy-repository]$ ant maven2-namespace
+Buildfile: /ivy/build-a-ivy-repository/build.xml
+
+load-ivy:
+
+init-ivy:
+
+maven2-namespace:
+[ivy:install] :: Ivy 2.2.0-rc1 - 20100629224905 :: http://ant.apache.org/ivy/
::
+[ivy:install] :: loading settings :: file =
/ivy/build-a-ivy-repository/settings/ivysettings-advanced.xml
+[ivy:install] DEPRECATED: 'defaultCache' is deprecated, use
'cach...@defaultcachedir]' instead
(file://ivy/build-a-ivy-repository/settings/ivysettings-advanced.xml)
+[ivy:install] :: installing apache#commons-lang;1.0 ::
+[ivy:install] :: resolving dependencies ::
+[ivy:install] found apache#commons-lang;1.0 in libraries
+[ivy:install] :: downloading artifacts to cache ::
+[ivy:install] downloading
http://repo1.maven.org/maven2/commons-lang/commons-lang/1.0/commons-lang-1.0.jar
...
+[ivy:install]
.......................................................................................................................
(62kB)
+[ivy:install] .. (0kB)
+[ivy:install] [SUCCESSFUL ] apache#commons-lang;1.0!commons-lang.jar (1919ms)
+[ivy:install] downloading
http://repo1.maven.org/maven2/commons-lang/commons-lang/1.0/commons-lang-1.0-javadoc.jar
...
+[ivy:install]
....................................................................................................................................................................................................................................................................................................................................................................
(170kB)
+[ivy:install] .. (0kB)
+[ivy:install] [SUCCESSFUL ] apache#commons-lang;1.0!commons-lang.jar(javadoc)
(3478ms)
+[ivy:install] :: installing in my-repository ::
+[ivy:install] published commons-lang to
/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/jars/commons-lang-1.0.jar
+[ivy:install] published commons-lang to
/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/javadocs/commons-lang-1.0.jar
+[ivy:install] published ivy to
/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/ivys/ivy-1.0.xml
+[ivy:install] :: install resolution report ::
+[ivy:install] :: resolution report :: resolve 0ms :: artifacts dl 5428ms
+ ---------------------------------------------------------------------
+ | | modules || artifacts |
+ | conf | number| search|dwnlded|evicted|| number|dwnlded|
+ ---------------------------------------------------------------------
+ | default | 1 | 1 | 1 | 0 || 2 | 2 |
+ ---------------------------------------------------------------------
+
+BUILD SUCCESSFUL
+Total time: 9 seconds
+
+</pre></div>
+
+Now if we look at our repository, it seems to look fine.
+<div class="shell"><pre>
+$ find /ivy/build-a-ivy-repository/myrepository/advanced -type f -print
+/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/ivys/ivy-1.0.xml
+/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/ivys/ivy-1.0.xml.md5
+/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/ivys/ivy-1.0.xml.sha1
+/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/jars/commons-lang-1.0.jar
+/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/jars/commons-lang-1.0.jar.md5
+/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/jars/commons-lang-1.0.jar.sha1
+/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/javadocs/commons-lang-1.0.jar
+/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/javadocs/commons-lang-1.0.jar.md5
+/ivy/build-a-ivy-repository/myrepository/advanced/apache/commons-lang/javadocs/commons-lang-1.0.jar.sha1
+
+</pre></div>
+We can even have a look at the commons-lang ivy file in our repo:
+<div><pre>
+<?xml version="1.0" encoding="UTF-8"?><br
class="xooki-br"/><ivy-module version="1.0"><br class="xooki-br"/>
<info organisation="apache"<br class="xooki-br"/>
module="commons-lang"<br class="xooki-br"/> revision="1.0"<br
class="xooki-br"/> status="integration"<br class="xooki-br"/>
publication="20051124062021"<br class="xooki-br"/>
namespace="ibiblio-maven2"<br class="xooki-br"/> /><br
class="xooki-br"/><br class="xooki-br"/>...
+</pre></div>
+Allright, we see that the organization is now 'apache'. But where did Ivy
picked this up?<br class="xooki-br"/><h2>How does this work ?</h2>
+Actually Ivy uses the same repository as before as source repository, with
only one difference: the namespace parameter:
+<pre>
+<ibiblio name="libraries" <br class="xooki-br"/>
root="${ibiblio-maven2-root}" <br class="xooki-br"/> m2compatible="true"<br
class="xooki-br"/> namespace="maven2"<br class="xooki-br"/>/>
+</pre>
+
+A namespace is defined by a set of rules. These rules are based on regular
expressions and tell Ivy how to convert data from the repository namespace from
and to what is called the system namespace, i.e. the namespace in which Ivy
runs most of the time (Ivy cache is always using the system namespace for
instance).<br class="xooki-br"/><br class="xooki-br"/>For the namespace we call
maven2, we have declared some rules, here is one:<br class="xooki-br"/><h3>rule
handling imported apache maven1 projects</h3>
+<pre><rule> <!-- imported apache maven1 projects --><br
class="xooki-br"/> <fromsystem><br class="xooki-br"/>
<src org="apache" module=".+"/><br class="xooki-br"/> <br
class="xooki-br"/> <dest org="$m0" module="$m0"/><br
class="xooki-br"/> </fromsystem><br class="xooki-br"/>
<tosystem><br class="xooki-br"/> <src org="commons-.+"
module="commons-.+" /><br class="xooki-br"/> <src org="ant.*"
module="ant.*" /><br class="xooki-br"/> ...<br class="xooki-br"/>
<src org="xmlrpc" module="xmlrpc" /><br class="xooki-br"/><br
class="xooki-br"/> <dest org="apache" module="$m0"/><br
class="xooki-br"/> </tosystem><br
class="xooki-br"/></rule></pre>
+<div class="postit"><u>Note about regular expressions usage :</u>
+In order to distinguish matching regular expressions found in organization,
module and revision the notation used prefixes the matching regular expression
with the letters 'o', 'm' and 'r'.<br class="xooki-br"/>$o0 : the whole
matching value in the organization attribute<br class="xooki-br"/>$o1 : the
first matching expression group that was marked in the organization
attribute<br class="xooki-br"/>...<br class="xooki-br"/>The same applies for
modules : $m0, $m1, ...<br class="xooki-br"/>and for revisions : $r0, $r1, ...
+</div>
+To understand namespaces,
+<ul>
+<li><b>fromsystem :</b> we define here that the projects defined in the system
namespace under the organization called "apache" are transformed into the
destination namespace into projects whose organization is named with the module
name, whatever the revision is. For example, the project
apache#commons-lang;1.0 in the system namespace will be translated into
commons-lang#commons-lang;1.0 in the maven2 resolver namespace.</li>
+<li><b>tosystem :</b> we define here the reverse mapping, ie how to translate
<em>apache</em> projects from maven 2 repo into apache projects in the system
namespace. The rule used here tells that all projects matching commons-.+ (see
it as java regular expression) for their organization name and module name are
transformed into projects whose organisation is apache with the module name as
it was found. The same kind of rule is applied for others apache projects like
ant, etc.</li>
+</ul>
+
+Ok, you should now get the idea behind namespace, you can now check the whole
namespace settings provided in the example, and test the installation of a
module and its dependencies using namespaces.<br class="xooki-br"/><br
class="xooki-br"/>Run <pre>ant maven2-namespace-deps</pre> and you will see the
resulting repository is cleaner than the first one we built.<br
class="xooki-br"/><br class="xooki-br"/>From our experience investing in
creating a namespace is worth the time it costs if you often need to add new
modules or revisions of third party libraries in your own repository, where
naming rules are already existing or rather strict.
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