PageCacheKey (Hippo Site Toolkit API 15.4.0 API)

All Superinterfaces:

Serializable
```
public interface PageCacheKey
extends Serializable
```
A PageCacheKey represents a key that can be used to qualify/categorize some request. Different Valves can contribute to this PageCacheKey through setAttribute(java.lang.String, java.io.Serializable).

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`seal()`	After `seal()` is invoked, a call to `setAttribute(String, Serializable)` will result in an `IllegalStateException`
`void`	`setAttribute(String subKey, Serializable keyFragment)`	All the combined attributes will make up the final `PageCacheKey`.

- Method Detail
  - setAttribute
```
void setAttribute(String subKey,
                  Serializable keyFragment)
           throws IllegalStateException
```
    All the combined attributes will make up the final PageCacheKey. Note that the ORDER in which the attributes are set DO influence the final created cachekey. Make sure that your added keyFragment object have a decentObject.hashCode() and Object.equals(Object) implementation that is also efficient as it will be used when storing objects in a cache with key PageCacheKey.
    
    The subKey can best be prefixed by namespacing (FQN of class calling the setAttribute) to avoid collisions. For example
    PageCacheKey#setAttribute(MyValve.class.getName() + ".ip", ip-address);
    Parameters:
    
    subKey - the key to which the fragment belongs, not allowed to be null
    
    keyFragment - the fragment for the subKey, not allowed to be null
    
    Throws:
    
    IllegalStateException - is this PageCacheKey has been sealed via seal()
  - seal
```
void seal()
```
    After seal() is invoked, a call to setAttribute(String, Serializable) will result in an IllegalStateException