Got examples done

samples/http_rest/http_rest.lyx

@@ -49,6 +49,15 @@ HTTP and REST
 \begin_layout Standard
 We explored Lift's HTML generation features.
  Let's dive down to a lower level and handle HTTP requests REST-style.
+ The code for this chapter can be found at 
+\begin_inset CommandInset href
+LatexCommand href
+name "https://github.com/dpp/simply_lift/tree/master/samples/http_rest"
+target "https://github.com/dpp/simply_lift/tree/master/samples/http_rest"
+
+\end_inset
+
+
 \end_layout
 
 \begin_layout Section
@@ -66,7 +75,58 @@ Lift makes use of Scala's pattern matching to allow you match incoming HTTP
  the results.
 \end_layout
 
+\begin_layout Section
+REST the hard way
+\end_layout
+
+\begin_layout Standard
+The 
+\end_layout
+
+\begin_layout Standard
+\begin_inset CommandInset include
+LatexCommand lstinputlisting
+filename "src/main/scala/code/lib/BasicExample.scala"
+lstparams "caption={BasicExample.scala}"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Section
+Making it easier with 
+\family typewriter
+RestHelper
+\end_layout
+
+\begin_layout Standard
+blasdasd
+\end_layout
+
+\begin_layout Standard
+\begin_inset CommandInset include
+LatexCommand lstinputlisting
+filename "src/main/scala/code/lib/BasicWithHelper.scala"
+lstparams "caption={BasicWithHelper.scala}"
+
+\end_inset
+
+
+\end_layout
+
+\begin_layout Section
+A complete REST example
+\end_layout
+
 \begin_layout Standard
+\begin_inset CommandInset include
+LatexCommand lstinputlisting
+filename "src/main/scala/code/lib/FullRest.scala"
+lstparams "caption={FullRest.scala}"
+
+\end_inset
+
 
 \end_layout
 

samples/http_rest/src/main/scala/code/lib/FullRest.scala

@@ -7,6 +7,8 @@ import net.liftweb._
 import common._
 import http._
 import rest._
+import util._
+import Helpers._
 import json._
 import scala.xml._
 
@@ -45,5 +47,20 @@ object FullRest extends RestHelper {
     // the POST body and update the item
     case Item(item) :: Nil JsonPost json -> _ => 
       Item(mergeJson(item, json)).map(Item.add(_): JValue)
+
+    // Wait for a change to the Items
+    // But do it asynchronously
+    case "change" :: Nil JsonGet _ =>
+      RestContinuation.async {
+        f => {
+          // schedule a "Null" return if there's no other answer
+          // after 110 seconds
+          Schedule.schedule(() => f(JNull), 110 seconds)
+
+          // register for an "onChange" event.  When it
+          // fires, return the changed item as a response
+          Item.onChange(item => f(item: JValue))
+        }
+      }
   })
 }

samples/http_rest/src/main/scala/code/model/Item.scala

@@ -3,6 +3,7 @@ package model
 
 import net.liftweb._
 import util._
+import Helpers._
 import common._
 import json._
 
@@ -25,6 +26,8 @@ object Item {
 
   private var items: List[Item] = parse(data).extract[List[Item]]
 
+  private var listeners: List[Item => Unit] = Nil
+
   /**
    * Convert the item to JSON format.  This is
    * implicit and in the companion object, so
@@ -63,8 +66,6 @@ object Item {
       case _ => None
     }
   }
-
-
 
   /**
    * Convert an item to XML
@@ -95,6 +96,7 @@ object Item {
    */
   def inventoryItems: Seq[Item] = items
 
+  // The raw data
   private def data = 
 """[
   {"id": "1234", "name": "Cat Food",
@@ -128,10 +130,16 @@ object Item {
 ]
 """
 
+  /**
+   * Select a random Item
+   */
   def randomItem: Item = synchronized {
     items(Helpers.randomInt(items.length))
   }
 
+  /**
+   * Find an item by id
+   */
   def find(id: String): Box[Item] = synchronized {
     items.find(_.id == id)
   }
@@ -142,7 +150,7 @@ object Item {
   def add(item: Item): Item = {
     synchronized {
       items = item :: items.filterNot(_.id == item.id)
-      item
+      updateListeners(item)
     }
   }
 
@@ -174,12 +182,37 @@ object Item {
       case _ => true
     }
 
-    ret
+    ret.map(updateListeners)
+  }
+
+  /**
+   * Update listeners when the data changes
+   */
+  private def updateListeners(item: Item): Item = {
+    synchronized {
+      listeners.foreach(f => 
+        Schedule.schedule(() => f(item), 0 seconds))
+
+      listeners = Nil
+    }
+    item
+  }
+
+  /**
+   * Add an onChange listener
+   */
+  def onChange(f: Item => Unit) {
+    synchronized {
+      // prepend the function to the list of listeners
+      listeners ::= f
+    }
   }
 
 }
 
-
+/**
+ * A helper that will JSON serialize BigDecimal
+ */
 object BigDecimalSerializer extends Serializer[BigDecimal] {
   private val Class = classOf[BigDecimal]