public void TestCache()
{
Func <string, TableDescription> creator = tn => client.DescribeTable(tn).Table;
var tableName = GetTableName();
var tableCache = SdkCache.GetCache <string, TableDescription>(client, DynamoDBTests.TableCacheIdentifier, StringComparer.Ordinal);
Assert.AreEqual(0, tableCache.ItemCount);
using (var counter = new ServiceResponseCounter(client))
{
var table = tableCache.GetValue(tableName, creator);
Assert.AreEqual(1, counter.ResponseCount);
Assert.AreEqual(1, tableCache.ItemCount);
// verify the item is still there
table = tableCache.GetValue(tableName, creator);
Assert.AreEqual(1, counter.ResponseCount);
// verify item was reloaded
tableCache.Clear(tableName);
table = tableCache.GetValue(tableName, creator);
Assert.AreEqual(2, counter.ResponseCount);
Assert.AreEqual(1, tableCache.ItemCount);
// test item expiration
tableCache.MaximumItemLifespan = TimeSpan.FromSeconds(1);
Thread.Sleep(tableCache.MaximumItemLifespan);
table = tableCache.GetValue(tableName, creator);
Assert.AreEqual(3, counter.ResponseCount);
Assert.AreEqual(1, tableCache.ItemCount);
}
}
public void ChangingTableTest()
{
var item = new Document(new Dictionary <string, DynamoDBEntry>
{
{ "Id", 42 },
{ "Name", "Floyd" },
{ "Coffee", "Yes" }
});
var tableCache = SdkCache.GetCache <string, TableDescription>(client, DynamoDBTests.TableCacheIdentifier, StringComparer.Ordinal);
CreateTable(defaultKeys: true);
var table = Table.LoadTable(client, tableName);
table.PutItem(item);
using (var counter = new ServiceResponseCounter(client))
{
var doc = table.GetItem(42, "Floyd");
Assert.IsNotNull(doc);
Assert.AreNotEqual(0, doc.Count);
Assert.AreEqual(1, counter.ResponseCount);
AssertExtensions.ExpectException(() => table.GetItem("Floyd", 42));
var oldTableDescription = tableCache.GetValue(tableName, null);
DeleteTable();
CreateTable(defaultKeys: false);
table.PutItem(item);
AssertExtensions.ExpectException(() => table.GetItem(42, "Yes"));
counter.Reset();
Table.ClearTableCache();
table = Table.LoadTable(client, tableName);
doc = table.GetItem(42, "Yes");
Assert.IsNotNull(doc);
Assert.AreNotEqual(0, doc.Count);
Assert.AreEqual(2, counter.ResponseCount);
counter.Reset();
Table.ClearTableCache();
PutItem(tableCache, tableName, oldTableDescription);
table = Table.LoadTable(client, tableName);
doc = tableCache.UseCache(tableName,
() => table.GetItem(42, "Yes"),
() => table = Table.LoadTable(client, tableName),
shouldRetryForException: null);
Assert.IsNotNull(doc);
Assert.AreNotEqual(0, doc.Count);
Assert.AreEqual(2, counter.ResponseCount);
}
}