Interface MethodInvoker

public interface MethodInvoker

MethodInvoker defines a generic API for invoking a Method within the Spring TestContext Framework.

Specifically, a MethodInvoker is made available to a TestExecutionListener via TestContext.getMethodInvoker(), and a TestExecutionListener can use the invoker to transparently benefit from any special method invocation features of the underlying testing framework.

For example, when the underlying testing framework is JUnit Jupiter, a TestExecutionListener can use a MethodInvoker to invoke arbitrary methods with JUnit Jupiter's parameter resolution mechanism. For other testing frameworks, the DEFAULT_INVOKER will be used.

Since:

6.1

Author:

Sam Brannen

See Also:

• ExecutableInvoker
• MethodInvoker

Field Summary

Fields

Modifier and Type	Field	Description
static final MethodInvoker	DEFAULT_INVOKER	Shared instance of the default MethodInvoker.

Method Summary

Modifier and Type	Method	Description
@Nullable Object	invoke(Method method, @Nullable Object target)	Invoke the supplied Method on the supplied target.

Field Details

DEFAULT_INVOKER

static final MethodInvoker DEFAULT_INVOKER

Shared instance of the default MethodInvoker.

This invoker never provides arguments to a Method.

Method Details

invoke

@Nullable Object invoke(Method method,
 @Nullable Object target)
                 throws Exception

Invoke the supplied Method on the supplied target.

When the DEFAULT_INVOKER is used — for example, when the underlying testing framework is JUnit 4 or TestNG — the method must not declare any formal parameters. When the underlying testing framework is JUnit Jupiter, parameters will be dynamically resolved via registered ParameterResolvers (such as the SpringExtension).

Parameters:

method - the method to invoke

target - the object on which to invoke the method, may be null if the method is static

Returns:

the value returned from the method invocation, potentially null

Throws:

Exception - if any error occurs