SessionPartition Class

1Cache.SessionPartition sessionPartition = Cache.Session.getPartition('namespace.myPartition');

1public class SessionPartitionController {
2  
3   // Name of a partition in the local namespace
4   String partitionInput = 'local.myPartition';
5   // Name of the key
6   String counterKeyInput = 'counter';
7   // Key initial value
8   Integer counterInitValue = 0;
9   // Session partition object
10   Cache.SessionPartition sessionPartition;
11               
12    // Constructor of the controller for the Visualforce page. 
13    public SessionPartitionController() {  
14    }
15            
16    // Adds counter value to the cache.
17    // This method is called when the Visualforce page loads.
18    public void init() {
19        // Create the partition instance based on the partition name
20        sessionPartition = getPartition();
21        
22        // Add counter to the cache with an initial value 
23        //  or increment it if it's already there.
24        if (!sessionPartition.contains(counterKeyInput)) {
25            sessionPartition.put(counterKeyInput, counterInitValue);
26        } else {
27            sessionPartition.put(counterKeyInput, getCounter() + 1);
28        }        
29    }
30    
31    // Returns the session partition based on the partition name
32    // given in the Visualforce page or the default value.
33    private Cache.SessionPartition getPartition() {
34       if (sessionPartition == null) {
35            sessionPartition = Cache.Session.getPartition(partitionInput);
36       }
37       
38       return sessionPartition;
39     }
40        
41    // Return counter from the cache.
42    public Integer getCounter() {
43        return (Integer)getPartition().get(counterKeyInput);
44    }
45    
46    // Invoked by the Submit button to save input values
47    //  supplied by the user.
48    public PageReference save() {
49        // Reset the initial key value in the cache
50        getPartition().put(counterKeyInput, counterInitValue);
51
52        return null;
53    }
54   
55    // Method invoked by the Rerender button on the Visualforce page.
56    // Updates the values of various cached values.
57    // Increases the values of counter and the MyData counter if those 
58    //   cache values are still in the cache.
59    public PageReference go() {
60        // Get the partition object
61        sessionPartition = getPartition();
62        // Increase the cached counter value or set it to 0 
63        //  if it's not cached.        
64        if (sessionPartition.contains(counterKeyInput)) {
65            sessionPartition.put(counterKeyInput, getCounter() + 1);
66        } else {
67            sessionPartition.put(counterKeyInput, counterInitValue);
68        }        
69    
70        return null;
71    }
72    
73    // Method invoked by the Remove button on the Visualforce page.
74    // Removes the datetime cached value from the session cache.
75    public PageReference remove() {
76        getPartition().remove(counterKeyInput);
77
78        return null;
79    }
80    
81    // Get and set methods for accessing variables
82    // that correspond to the input text fields on
83    // the Visualforce page.
84    public String getPartitionInput() {
85        return partitionInput;
86    }
87    
88    public String getCounterKeyInput() {
89        return counterKeyInput;
90    }
91    
92    public Integer getCounterInitValue() {
93        return counterInitValue;
94    }
95    
96    public void setPartitionInput(String partition) {
97        this.partitionInput = partition;
98    }
99    
100    public void setCounterKeyInput(String keyName) {
101        this.counterKeyInput = keyName;
102    }
103    
104    public void setCounterInitValue(Integer counterValue) {
105        this.counterInitValue = counterValue;
106    }
107}