Dictionary Behavior and Usage in Cache
Note
This feature is only available in the NCache Enterprise Edition.
A dictionary is a general-purpose data structure for storing a group of objects. It is also called a Hash, Map, and HashMap. It is an unordered data structure, which provides a mapping of string keys against the values. For example, a dictionary can be used to store the information of all the products in a superstore against their productID as the dictionary entry key.
NCache further enhances the dictionary datatype by providing NCache specific features such as Groups, Tags, Expiration, Locking, Dependencies, and more against it.
Note
In Java, a Map corresponds to a Dictionary in .NET.
Behavior
- A dictionary value can be of any primitive type or custom object.
- A dictionary of
CacheItem
and nested dictionaries are not yet supported.
- Dictionaries are named. Hence, you need to provide a unique cache key for each dictionary.
- A dictionary key can only be of string type.
- Duplicate dictionary keys are not allowed.
Prerequisites
- To learn about the standard prerequisites required to work with all NCache client side features please refer to the given page on Client Side API Prerequisites.
- For API details, refer to: ICache, IDistributedDictionary, IDataTypeManager, CreateDictionary, IDictionary, GetDictionary, ICollectionManager, RegisterNotification, DataTypeDataNotificationCallback, EventType, DataTypeEventDataFilter, Lock, Unlock.
- To learn about the standard prerequisites required to work with all NCache client side features please refer to the given page on Client Side API Prerequisites.
- For API details, refer to: Cache, DistributedMap, getDataStructuresManager, createMap, getMap, EventType, getEventType, DataStructureDataChangeListener, onDataStructureChanged, DataStructureEventArg, DataTypeEventDataFilter, getCollectionItem, lock, unlock.
- To learn about the standard prerequisites required to work with all NCache client side features please refer to the given page on Client Side API Prerequisites.
- For API details, refer to: Cache, DistributedDictionary, DataStructureManager, get_data_structures_manager, create_dictionary, get_dictionary, get_iterator, get_event_type, DataTypeEventDataFilter, EventDataFilter.
Create Dictionary and Add Data
The following code sample shows how a dictionary is created in the cache against the cache key ProductDictionary and then data is added in the dictionary.
try
{
// Pre-condition: Cache must be connected
// Specify unique cache key for dictionary
string key = "ProductDictionary";
// Create dictionary of Product type
IDistributedDictionary<string, Product> dictionary = cache.DataTypeManager.CreateDictionary<string, Product>(key);
// Adding products to dictionary
Product[] products = FetchProducts();
foreach(var product in products)
{
// Add products
string productKey = $"Product:{product.ProductID}";
dictionary.Add(productKey, product);
}
}
catch (OperationFailedException ex)
{
// NCache specific exception
if(ex.ErrorCode == NCacheErrorCodes.KEY_ALREADY_EXISTS)
{
// The specified key already exists in cache,
// Either remove the existing object from cache
// Or specify another key
}
else if (ex.ErrorCode == NCacheErrorCodes.CACHEITEM_IN_DATA_STRUCTURES)
{
// Data structures cannot be of CacheItem type
// CacheItems cannot be added in data structures
}
else
{
// NCache specific exception
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
}
catch (Exception ex)
{
// Any generic exception like ArgumentNullException or ArgumentException
}
try {
// Pre-condition: Cache must be connected
// Specify unique cache key for map
String key = "ProductMap";
// Create Map of Product type
DistributedMap<String, Product> map = cache.getDataStructuresManager().createMap(key, Product.class);
// Adding products to map
Product[] products = fetchProducts();
for (var product : products) {
// Add products
String productKey = "Product:" + product.getProductID();
map.put(productKey, product);
}
} catch (OperationFailedException ex) {
if (ex.getErrorCode() == NCacheErrorCodes.KEY_ALREADY_EXISTS) {
// The specified key already exists in cache,
// Either remove the existing object from cache
// Or specify another key
} else if (ex.getErrorCode() == NCacheErrorCodes.CACHEITEM_IN_DATA_STRUCTURES) {
// Data structures cannot be of CacheItem type
// CacheItems cannot be added in data structures
} else {
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
} catch (Exception ex) {
// Any generic exception like IllegalArgumentException or NullPointerException
}
try {
// Pre-condition: Cache must be connected// Pre-condition: Cache must be connected
// Specify unique cache key for dictionary
val key = "ProductDictionary"
// Create dictionary of Product type
val dictionary = cache.getDataStructuresManager.createMap(key, classOf[Product])
// Adding products to dictionary
val products = fetchProducts()
for (product <- products) { // Add products
val productKey = "Product:" + product.getProductId
dictionary.put(productKey, product)
}
}
catch {
case exception: Exception => {
// Handle any errors
}
}
try:
# Pre-condition: Cache must be connected
# Specify unique cache key for dictionary
key = "ProductDictionary"
# Create dictionary of Product type
dictionary = cache.get_data_structures_manager().create_dictionary(key, Product)
# Adding products to dictionary
products = fetch_products()
for product in products:
# Add products
product_key = "Product:" + product.get_product_id()
dictionary.put(product_key, product)
except Exception as exp:
# Handle errors
Note
To ensure the operation is fail safe, it is recommended to handle any potential exceptions within your application, as explained in Handling Failures.
Fetch Dictionary from Cache
You can fetch a dictionary from the cache which takes a cache key as a parameter. This key is the name of the dictionary, which is specified during the dictionary creation.
Warning
If the item being fetched is not of dictionary type, a Type mismatch
exception is thrown.
try
{
// Pre-condition: Cache is already connected
// Dictionary with this key already exists in cache
string key = "ProductDictionary";
// Get dictionary and show items of dictionary
IDistributedDictionary<string, Product> retrievedDictionary = cache.DataTypeManager.GetDictionary<string, Product>(key);
if (retrievedDictionary != null)
{
foreach (var item in retrievedDictionary)
{
// Perform operations
}
}
else
{
// Dictionary does not exist
}
}
catch (OperationFailedException ex)
{
// NCache specific exception
if(ex.ErrorCode == NCacheErrorCodes.NOT_A_DICTIONARY)
{
// The item being fetched is not of Dictionary type
// Cache key corresponds to an item of a different data structure
}
else
{
// NCache specific exception
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
}
catch (Exception ex)
{
// Any generic exception like ArgumentNullException or ArgumentException
}
try {
// Pre-condition: Cache is already connected
// Map with this key already exists in cache
String key = "ProductMap";
// Get map and show items of map
DistributedMap<String, Product> retrievedMap = cache.getDataStructuresManager().getMap(key, Product.class);
if (retrievedMap != null) {
for (var item : retrievedMap) {
// Perform operations
}
} else {
// Map does not exist
}
} catch (OperationFailedException ex) {
if (ex.getErrorCode() == NCacheErrorCodes.NOT_A_DICTIONARY) {
// Item being fetched is not of Map/Dictionary type
// Cache key corresponds to an item of different data structure
} else {
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
} catch (Exception ex) {
// Any generic exception like IllegalArgumentException or NullPointerException
}
try {
// Pre-condition: Cache is already connected
// Dictionary with this key already exists in cache
val key = "ProductDictionary"
// Get dictionary and show items of dictionary
val retrievedDictionary = cache.getDataStructuresManager.getMap(key, classOf[Product])
if (retrievedDictionary != null) {
for (item <- retrievedDictionary.iterator) {
// Perform operations
}
}
else {
// Dictionary does not exist
}
}
catch {
case exception: Exception => {
// Handle any errors
}
}
try:
# Pre-condition: Cache is already connected
# Dictionary with this key already exists in cache
key = "ProductDictionary"
# Get dictionary and show items of dictionary
retrieved_dictionary = cache.get_data_structures_manager().get_dictionary(key, Product)
if retrieved_dictionary is not None:
for item in retrieved_dictionary.get_iterator():
# Perform operations
print(item)
else:
# Dictionary does not exist
print("Dictionary not found")
except Exception as exp:
# Handle errors
Fetch Values of Specific Dictionary Keys
You can get values of only dictionary entries using Get
. The following code sample uses the dictionary
instance from the example for adding data to dictionary and gets values against the keys specified.
Note
If no value exists against the key specified, null is returned.
try
{
// Pre-condition: Cache is already connected
// Dictionary exists in cache
// Create list of keys to fetch corresponding values
var keys = new List<string>();
keys.Add("Product:1001");
keys.Add("Product:1002");
keys.Add("Product:1003");
// Get values against keys
// "dictionary" instance was created while creating dictionary
ICollection<Product> values = dictionary.Get(keys);
foreach (var value in values)
{
// Perform operations
}
}
catch (OperationFailedException ex)
{
// NCache specific exception
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
catch (Exception ex)
{
// Any generic exception like ArgumentNullException or ArgumentException
}
try {
// Pre-condition: Cache is already connected
// Map exists in cache
// Create list of keys to fetch corresponding values
var keys = new ArrayList<String>();
keys.add("Product:1001");
keys.add("Product:1002");
keys.add("Product:1003");
// Get values against keys
// "map" instance was created while creating map
Collection<Product> values = map.get(keys);
for (var value : values) {
// Perform operations
}
} catch (OperationFailedException ex) {
//NCache specific exception
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
} catch (Exception ex) {
// Any generic exception like IllegalArgumentException or NullPointerException
}
try {
// Pre-condition: Cache is already connected
// Dictionary exists in cache
// Create list of keys to fetch corresponding values
val keys = List("Product:1001", "Product:1002", "Product:1003")
// Get values against keys
// "dictionary" instance was created while creating dictionary
val values = dictionary.get(keys)
for (value <- values) {
// Perform operations
}
}
catch {
case exception: Exception => {
// Handle any errors
}
}
try:
# Pre-condition: Cache is already connected
# Dictionary exists in cache
# Create list of keys to fetch corresponding values
keys = [
"Product:1001",
"Product:1002",
"Product:1003"
]
# Get values against keys
# "dictionary" instance was created while creating dictionary
values = dictionary.get(keys)
for value in values:
# Perform operations
print(value)
except Exception as exp:
# Handle errors
Insert Data to Existing Dictionary
You can insert data into an existing dictionary using Insert
. The following code sample fetches new products from the data source and inserts them into a dictionary that already exists within the cache.
Note
If the keys already exist, this will overwrite the values in the dictionary.
try
{
// Pre-condition: Cache is already connected
// Dictionary with this key already exists in cache
string key = "ProductDictionary";
// Get dictionary to insert more values
IDistributedDictionary<string, Product> retrievedDictionary = cache.DataTypeManager.GetDictionary<string, Product>(key);
// Create dictionary of new products to be added
IDictionary<string, Product> newProducts = new Dictionary<string, Product>();
Product[] products = FetchProducts();
foreach (var product in products)
{
// Add new products
string productKey = $"Product:{product.ProductID}";
newProducts.Add(productKey, product);
}
// Append dictionary entries to existing dictionary
retrievedDictionary.Insert(newProducts);
}
catch (OperationFailedException ex)
{
// NCache specific exception
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
catch (Exception ex)
{
// Any generic exception like ArgumentNullException or ArgumentException
}
try {
// Pre-condition: Cache is already connected
// Map with this key already exists in cache
String key = "ProductMap";
// Get map to insert more values
DistributedMap<String, Product> retrievedMap = cache.getDataStructuresManager().getMap(key, Product.class);
// Create map of new products to be added
DistributedMap<String, Product> newProducts = cache.getDataStructuresManager().getMap(key, Product.class);
Product[] products = fetchProducts();
for (var product : products) {
// Add new products
String productKey = "Product:" + product.getProductID();
newProducts.put(productKey, product);
}
// Append map entries to existing map
retrievedMap.insert(newProducts);
} catch (OperationFailedException ex) {
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
} catch (Exception ex) {
// Any generic exception like IllegalArgumentException or NullPointerException
}
try {
// Pre-condition: Cache is already connected
// Dictionary with this key already exists in cache
val key = "ProductDictionary"
// Get dictionary to insert more values
val retrievedDictionary = cache.getDataStructuresManager.getMap(key, classOf[Product])
// Create dictionary of new products to be added
var newProducts: Map[String, Product] = Map()
val products = fetchProducts()
for (product <- products) { // Add new products
val productKey = "Product:" + product.getProductId
newProducts = newProducts + (productKey -> product)
}
// Append dictionary entries to existing dictionary
retrievedDictionary.insert(newProducts)
// You can verify using retrievedDictionary.count
}
catch {
case exception: Exception => {
// Handle any errors
}
}
try:
# Pre-condition: Cache is already connected
# Dictionary with this key already exists in cache
key = "ProductDictionary"
# Get dictionary to insert more values
retrieved_dictionary = cache.get_data_structures_manager().get_dictionary(key, Product)
# Create dictionary of new products to be added
new_products = {}
products = fetch_products()
for product in products:
# Add new products
product_key = "Product:" + product.get_product_id()
new_products[product_key] = product
# Append dictionary entries to existing dictionary
retrieved_dictionary.insert(new_products)
# You can verify using len(retrieved_dictionary)
except Exception as exp:
# Handle errors
Remove Items from Dictionary
Note
If the key specified to be removed does not exist, nothing is returned. You can verify the number of keys returned using the return type of Remove
.
Items can be removed from a dictionary against a given collection of keys. The following code sample removes the dictionary entities for the expired products using Remove
.
try
{
// Pre-condition: Cache is already connected
// Dictionary with this key already exists in cache
string key = "ProductDictionary";
// Get dictionary and show items of dictionary
IDistributedDictionary<string, Product> retrievedDictionary = cache.DataTypeManager.GetDictionary<string, Product>(key);
// Create list of keys to remove
List<string> keysToRemove = FetchExpiredProducts();
// Number of keys removed is returned
int itemsRemoved = retrievedDictionary.Remove(keysToRemove);
}
catch (OperationFailedException ex)
{
// NCache specific exception
if(ex.ErrorCode == NCacheErrorCodes.NOT_A_DICTIONARY)
{
// Item being fetched is not of Dictionary type
// Cache key corresponds to an item of different data structure
}
else
{
// NCache specific exception
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
}
catch (Exception ex)
{
// Any generic exception like ArgumentNullException or ArgumentException
}
try {
// Pre-condition: Cache is already connected
// Map with this key already exists in cache
String key = "ProductMap";
// Get map and show items of map
DistributedMap<String, Product> retrievedMap = cache.getDataStructuresManager().getMap(key, Product.class);
// Create list of keys to remove
List<String> keysToRemove = fetchExpiredProducts();
// Number of keys removed is returned
int itemsRemoved = retrievedMap.remove(keysToRemove);
} catch (OperationFailedException ex) {
if (ex.getErrorCode() == NCacheErrorCodes.NOT_A_DICTIONARY) {
// Item being fetched is not of Map/Dictionary type
// Cache key corresponds to an item of different data structure
} else {
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
} catch (Exception ex) {
// Any generic exception like IllegalArgumentException or NullPointerException
}
try {
// Pre-condition: Cache is already connected
// Dictionary with this key already exists in cache
val key = "ProductDictionary"
// Get dictionary and show items of dictionary
val retrievedDictionary = cache.getDataStructuresManager.getMap(key, classOf[Product])
// Create list of keys to remove
val keysToRemove = fetchExpiredProducts()
// Number of keys removed is returned
val itemsRemoved = retrievedDictionary.remove(keysToRemove)
}
catch {
case exception: Exception => {
// Handle any errors
}
}
try:
# Pre-condition: Cache is already connected
# Dictionary with this key already exists in cache
key = "ProductDictionary"
# Get dictionary and show items of dictionary
retrieved_dictionary = cache.get_data_structures_manager().get_dictionary(key, Product)
# Create list of keys to remove
keys_to_remove = fetch_expired_products_ids()
# Number of keys removed is returned
items_removed = retrieved_dictionary.remove(keys_to_remove)
except Exception as exp:
# Handle errors
Event Notifications on Dictionary
You can register cache events, key-based events, and data structure events on a data structure such as dictionary. For behavior, refer to feature wise behavior.
The following code sample registers a cache event of ItemAdded
and ItemUpdated
as well as registers an event for ItemAdded
and ItemUpdated
on the dictionary in cache.
Once a dictionary is created in the cache, an ItemAdded
cache level event is fired. However, once an item is added to the dictionary, an ItemAdded
data structure event is fired, and an ItemUpdated
cache level event is fired.
Register Event on Dictionary Created
try
{
// Pre-condition: Cache is already connected
// Unique cache key for dictionary
string key = "ProductDictionary";
// Create dictionary of Product type
IDistributedDictionary<string, Product> dictionary = cache.DataTypeManager.CreateDictionary<string, Product>(key);
// Register ItemAdded, ItemUpdated, ItemRemoved events on dictionary created
// DataTypeNotificationCallback is callback method specified
dictionary.RegisterNotification(DataTypeDataNotificationCallback, EventType.ItemAdded |
EventType.ItemUpdated | EventType.ItemRemoved,
DataTypeEventDataFilter.Data);
// Perform operations
}
catch (OperationFailedException ex)
{
// NCache specific exception
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
catch (Exception ex)
{
// Any generic exception like ArgumentNullException or ArgumentException
}
try {
// Precondition: Cache is already connected
// Unique cache key for map
String key = "ProductMap";
// Create map of type Product
DistributedMap<String, Product> map = cache.getDataStructuresManager().createMap(key, Product.class);
// Create EnumSet of event types
EnumSet<EventType> enumSet = EnumSet.of(com.alachisoft.ncache.runtime.events.EventType.ItemAdded,
EventType.ItemUpdated, EventType.ItemRemoved);
// Register ItemAdded, ItemUpdated, ItemRemoved events on queue created
// dataChangeListener is the specified callback method
DataStructureDataChangeListener dataChangeListener = dataStructureListener.onDataStructureChanged(collectionName, args);
map.addChangeListener(dataChangeListener, enumSet, DataTypeEventDataFilter.Data);
// Perform operations
} catch (OperationFailedException ex) {
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
} catch (Exception ex) {
// Any generic exception like IllegalArgumentException or NullPointerException
}
try {
// Precondition: Cache is already connected
// Unique cache key for dictionary
val key = "ProductMap"
// Initialize change listener
val dataStructureListener = MapDataStructureChangeListener()
// Create list of Product type
val list = cache.getDataStructuresManager.createList(key, classOf[Product])
// Register ItemAdded, ItemUpdated, ItemRemoved events on list created
val enumSet = List(EventType.ItemAdded, EventType.ItemUpdated, EventType.ItemRemoved)
dictionary.addChangeListener(dataStructureListener, enumSet, DataTypeEventDataFilter.Data)
// Perform operations
}
catch {
case exception: Exception => {
// Handle any errors
}
}
def datastructure_callback_function(collection_name, collection_event_args):
# Perform Operations
print("Event Fired for " + str(collection_name))
try:
# Precondition: Cache is already connected
# Unique cache key for dictionary
key = "ProductDictionary"
# Create dictionary
product_dictionary = cache.get_data_structures_manager().create_hashset(key, int)
# Register ItemAdded, ItemUpdated, ItemRemoved events on hashset created
events_list = [ncache.EventType.ITEM_ADDED, ncache.EventType.ITEM_UPDATED, ncache.EventType.ITEM_REMOVED]
product_dictionary.add_change_listener(datastructure_callback_function, events_list, ncache.DataTypeEventDataFilter.DATA)
# Perform operations
except Exception as exp:
# Handle errors
Specify Callback for Event Notification
private void DataTypeDataNotificationCallback(string collectionName, DataTypeEventArg collectionEventArgs)
{
switch (collectionEventArgs.EventType)
{
case EventType.ItemAdded:
// Item has been added to the collection
break;
case EventType.ItemUpdated:
if (collectionEventArgs.CollectionItem != null)
{
// Item has been updated in the collection
// Perform operations
}
break;
case EventType.ItemRemoved:
// Item has been removed from the collection
break;
}
}
DataStructureDataChangeListener dataStructureListener = new DataStructureDataChangeListener() {
@Override
public void onDataStructureChanged(String collection, DataStructureEventArg dataStructureEventArg) {
switch (dataStructureEventArg.getEventType()) {
case ItemAdded:
// Item has been added to the collection
break;
case ItemUpdated:
if (dataStructureEventArg.getCollectionItem() != null) {
//Item has been updated in the collection
// perform operations
}
break;
case ItemRemoved:
//Item has been removed from the collection
break;
}
}
};
class MapDataStructureChangeListener extends DataStructureDataChangeListener {
override def onDataStructureChanged(collectionName: String, collectionEventArgs: DataStructureEventArg): Unit = {
collectionEventArgs.getEventType match {
case EventType.ItemAdded =>
// Item has been added to the collection
case EventType.ItemUpdated =>
if (collectionEventArgs.getCollectionItem != null) {
//Item has been updated in the collection
// perform operations
}
case EventType.ItemRemoved =>
//Item has been removed from the collection
}
}
}
def datastructure_callback_function(collection_name: str, collection_event_args: DataStructureEventArg):
if collection_event_args.get_event_type() is ncache.EventType.ITEM_ADDED:
# Item has been added to the collection
print("Item added in " + collection_name)
elif collection_event_args.get_event_type() is ncache.EventType.ITEM_UPDATED:
# Item has been updated in the collection
print("Item updated in " + collection_name)
elif collection_event_args.get_event_type() is ncache.EventType.ITEM_REMOVED:
# Item has been removed from the collection
print("Item removed from " + collection_name)
Locking Dictionary
Dictionary can be explicitly locked and unlocked to ensure data consistency. The following code sample creates a dictionary and locks it for a period of 10 seconds using Lock() and then unlocks it using Unlock().
try
{
// Pre-conditions: Cache is already connected
// Dictionary exists with key "ProductDictionary"
// Cache Key
string key = "ProductDictionary";
// Get dictionary
IDistributedDictionary<string, Product> dictionary = cache.DataTypeManager.GetDictionary<string, Product>(key);
// Lock dictionary for 10 seconds
bool isLocked = dictionary.Lock(TimeSpan.FromSeconds(10));
if (isLocked)
{
// Dictionary is successfully locked for 10 seconds
// Unless explicitly unlocked
}
else
{
// Dictionary is not locked because either:
// Dictionary is not present in the cache
// Dictionary is already locked
}
dictionary.Unlock();
}
catch (OperationFailedException ex)
{
// NCache specific exception
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
}
catch (Exception ex)
{
// Any other generic exception like ArgumentNullException or ArgumentException
}
try {
// Pre-conditions: Cache is already connected
// Map exists with key "ProductMap"
// Cache Key
String key = "ProductMap";
// Get dictionary
DistributedMap<String, Product> map = cache.getDataStructuresManager().getMap(key, Product.class);
// Lock map for 10 seconds
boolean isLocked = map.lock(TimeSpan.FromSeconds(10));
if (isLocked) {
// Map is successfully locked for 10 seconds
// Unless explicitly unlocked
} else {
// Map is not locked because either:
// Map is not present in the cache
// Map is already locked
}
map.unlock();
} catch (OperationFailedException ex) {
// NCache specific exception
// Exception can occur due to:
// Connection Failures
// Operation Timeout
// Operation performed during state transfer
} catch (Exception ex) {
// Any generic exception like IllegalArgumentException or NullPointerException
}
try {
// Pre-conditions: Cache is already connected
// Dictionary exists with key "ProductDictionary"
// Cache Key
val key: String = "ProductDictionary"
// Get dictionary
val productDictionary = cache.getDataStructuresManager.getMap(key, classOf[Product])
val isLocked: Boolean = productDictionary.lock(TimeSpan.FromSeconds(10))
if (isLocked) {
// Dictionary is successfully locked for 10 seconds
// Unless explicitly unlocked
}
else {
// Dictionary is not locked because either:
// Dictionary is not present in the cache
// Dictionary is already locked
}
productDictionary.unlock()
}
catch {
case exception: Exception => {
// Handle any errors
}
}
Additional Resources
NCache provides a sample application for the dictionary data structure on GitHub.
See Also
Queue Behavior and Usage in Cache
Sets Behavior and Usage in Cache
Counter Behavior and Usage in Cache
Configure Searchable Attributes
Configure Invalidation Attributes