Complex Scenarios. Traffic Class
In dotMemory Unit, memory traffic is represented with the Traffic type. The object of the Traffic type is returned as a result of the Memory.GetTrafficFrom* method.
To slice and dice traffic data, you should use a lambda expression passed to the Where method of the Traffic type. The Where method also returns an instance of the Traffic type allowing you to build chains of Where methods.
The Traffic type allows you to get data about allocated and collected memory using two properties: AllocatedMemory and CollectedMemory. These properties, in turn, have the ObjectsCount and SizeInBytes properties that you can use in test assertions.
Example
For example, to make the assertion that the bar.Foo() method allocates no more than 1000 objects of the string type, write the following:
[DotMemoryUnit(CollectAllocations=True)] // collect traffic data
[Test]
public void TestMethod1()
{
var checkPoint1 = dotMemory.Check();
bar.Foo();
dotMemory.Check(memory =>
{
Assert.That(memory.GetTrafficFrom(checkPoint1).Where(traffic => traffic.Type.Is<string>())
.AllocatedMemory.ObjectsCount, Is.LessThan(1000));
});
} dotMemory Unit also provides alternative syntax for traffic queries. You can use the == , &, and | logic operators to combine a number of queries. For example:
Assert.That(memory.GetTrafficFrom(memoryCheckPoint2).Where(obj => obj.Type == typeof(Foo) | obj.Interface == typeof(IEnumerable))
.AllocatedMemory.ObjectsCount, Is.LessThan(10));Traffic Class
Traffic Methods
| Name | Description |
|---|---|
Where(Func<TrafficProperty, Query> query): Traffic | Gets memory traffic data by a specific condition. The condition is defined by a Query that should be returned by a lambda expression. The TrafficProperty instance passed to the lambda allows creating queries that filter traffic data by object type, interface, and other parameters. Returns an instance of the Traffic type. |
Where(TrafficQuery predicate): Traffic | Gets memory traffic data by a specific condition. The condition is defined by a reusable query - an instance of the TrafficPredicateQuery type. See QueryBuilder for details. Returns an instance of the Traffic type. |
Traffic Properties
| Name | Type | Description |
|---|---|---|
AllocatedMemory | MemoryInfo | Data on allocated objects: objects count and total size. |
CollectedMemory | MemoryInfo | Data on collected objects: objects count and total size. |
MemoryInfo Struct
The MemoryInfo struct is used to get data about number of objects and their size.
MemoryInfo Properties
| Name | Type | Description |
|---|---|---|
ObjectsCount | int | Total number of objects in the set. |
SizeInBytes | long | Total size of objects in the set. |
TrafficProperty Class
Filters traffic by a specific condition: type, interface, and other.
TrafficProperty Properties
| Name | Type | Description |
|---|---|---|
Type | TypeProperty | Allows filtering traffic by object type. |
Interface | InterfaceProperty | Allows filtering traffic by interface. |
Namespace | NamespaceProperty | Allows filtering traffic by namespace. |
Assembly | AssemblyProperty | Allows filtering traffic by assemblies. |