RequestPageCache should canonicalize page name
----------------------------------------------
Key: TAP5-258
URL: https://issues.apache.org/jira/browse/TAP5-258
Project: Tapestry 5
Issue Type: Bug
Components: tapestry-core
Affects Versions: 5.0.15
Reporter: Ivan Dubrov
Since the RequestPageCache does not canonicalize the page name, there is a
possibility that same page will be put into page cache twice, one time with
canonical name and second time with non-canonical.
For example, I have a "Index" page in the orders package. When I open the
"/app/orders" page, the Page instance is put into the RequestPageCache under
the "orders" key. So when I get the Page from the cache by
requestPageCache.get(resources.getPageName()), I get different Page instance
(since resources.getPageName() returns canonicalized page name, which is
"/app/orders/index").
This could lead to loss of activation parameter. Example:
Index.java:
{code:java}
...
@Property(write = false)
@PageActivationContext(activate = false)
private Integer orderId;
...
{code}
Index.tml:
{code:xml}
...
<t:pagelink t:page="orders/index">Broken link</t:pagelink>
<t:pagelink t:page="orders">Correct link<t:pagelink>
...
{code}
If you open page /app/orders/123, the first link will be just "/app/orders" and
second will be "/orders/123" (correct one).
The following snippet shows how this could be fixed now (the idea is to
canonicalize page name before retrieving it from the cache):
{code:java}
public static RequestPageCache decorateRequestPageCache(
Class<RequestPageCache> serviceInterface, final
RequestPageCache delegate,
String serviceId, final ComponentClassResolver
resolver) {
return new RequestPageCache() {
public Page get(String logicalPageName) {
return
delegate.get(resolver.canonicalizePageName(logicalPageName));
}
};
}
{code}
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