AbstractExternalizedFlowExecutionTests.java
/*
* Copyright 2004-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.webflow.test.execution;
import org.springframework.core.io.DefaultResourceLoader;
import org.springframework.core.io.ResourceLoader;
import org.springframework.webflow.config.FlowDefinitionResource;
import org.springframework.webflow.config.FlowDefinitionResourceFactory;
import org.springframework.webflow.core.collection.AttributeMap;
import org.springframework.webflow.definition.FlowDefinition;
import org.springframework.webflow.definition.registry.FlowDefinitionRegistry;
import org.springframework.webflow.engine.Flow;
import org.springframework.webflow.engine.builder.FlowAssembler;
import org.springframework.webflow.engine.builder.FlowBuilder;
import org.springframework.webflow.engine.builder.support.FlowBuilderServices;
import org.springframework.webflow.engine.impl.FlowExecutionImplFactory;
import org.springframework.webflow.execution.FlowExecutionListener;
import org.springframework.webflow.execution.factory.StaticFlowExecutionListenerLoader;
import org.springframework.webflow.test.MockFlowBuilderContext;
/**
* Base class for flow integration tests that verify an externalized flow definition executes as expected. Supports
* caching of the flow definition built from an externalized resource to speed up test execution.
*
* @author Keith Donald
* @author Scott Andrews
*/
public abstract class AbstractExternalizedFlowExecutionTests extends AbstractFlowExecutionTests {
/**
* The cached flow definition.
*/
private static Flow cachedFlowDefinition;
/**
* The flag indicating if the flow definition built from an externalized resource as part of this test should be
* cached.
*/
private boolean cacheFlowDefinition;
/**
* A helper for constructing paths to flow definition resources in the filesystem, classpath, or other location.
*/
private FlowDefinitionResourceFactory resourceFactory;
/**
* Private flow builder context object.
*/
private MockFlowBuilderContext flowBuilderContext;
/**
* Constructs a default externalized flow execution test.
* @see #setName(String)
*/
public AbstractExternalizedFlowExecutionTests() {
init();
}
/**
* Constructs an externalized flow execution test with given name.
* @param name the name of the test
*/
public AbstractExternalizedFlowExecutionTests(String name) {
super(name);
init();
}
/**
* Returns if flow definition caching is turned on.
*/
protected boolean isCacheFlowDefinition() {
return cacheFlowDefinition;
}
/**
* Sets the flag indicating if the flow definition built from an externalized resource as part of this test should
* be cached. Default is false.
*/
protected void setCacheFlowDefinition(boolean cacheFlowDefinition) {
this.cacheFlowDefinition = cacheFlowDefinition;
}
/**
* Sets system attributes to be associated with the flow execution the next time one is started. by this test.
* Useful for assigning attributes that influence flow execution behavior.
* @param executionAttributes the system attributes to assign
*/
protected void setFlowExecutionAttributes(AttributeMap<Object> executionAttributes) {
getFlowExecutionImplFactory().setExecutionAttributes(executionAttributes);
}
/**
* Set a single listener to be attached to the flow execution the next time one is started by this test. Useful for
* attaching a listener that does test assertions during the execution of the flow.
* @param executionListener the listener to attach
*/
protected void setFlowExecutionListener(FlowExecutionListener executionListener) {
getFlowExecutionImplFactory().setExecutionListenerLoader(
new StaticFlowExecutionListenerLoader(executionListener));
}
/**
* Set the listeners to be attached to the flow execution the next time one is started. by this test. Useful for
* attaching listeners that do test assertions during the execution of the flow.
* @param executionListeners the listeners to attach
*/
protected void setFlowExecutionListeners(FlowExecutionListener[] executionListeners) {
getFlowExecutionImplFactory().setExecutionListenerLoader(
new StaticFlowExecutionListenerLoader(executionListeners));
}
/**
* Returns the factory used to create pointers to externalized flow definition resources.
* @return the resource factory
*/
protected FlowDefinitionResourceFactory getResourceFactory() {
return resourceFactory;
}
/**
* Returns the {@link ResourceLoader} used by the {@link FlowDefinitionResourceFactory} to load flow resources from
* a path. Subclasses may override to customize the resource loader used.
* @see #getResourceFactory()
* @return the resource loader
*/
protected ResourceLoader createResourceLoader() {
return new DefaultResourceLoader();
}
protected final FlowDefinition getFlowDefinition() {
if (isCacheFlowDefinition() && cachedFlowDefinition != null) {
return cachedFlowDefinition;
}
Flow flow = buildFlow();
if (isCacheFlowDefinition()) {
cachedFlowDefinition = flow;
}
return flow;
}
/**
* Returns the flow definition being tested as a {@link Flow} implementation. Useful if you need to do specific
* assertions against the configuration of the implementation.
*/
protected final Flow getFlow() {
return (Flow) getFlowDefinition();
}
/**
* Factory method to assemble a flow definition from a resource. Called by {@link #getFlowDefinition()} to create
* the "main" flow to test. May also be called by subclasses to create subflow definitions whose executions should
* also be exercised by this test.
* @return the built flow definition, ready for execution
*/
protected final Flow buildFlow() {
FlowDefinitionResource resource = getResource(getResourceFactory());
flowBuilderContext = new MockFlowBuilderContext(resource.getId(), resource.getAttributes());
configureFlowBuilderContext(flowBuilderContext);
FlowBuilder builder = createFlowBuilder(resource);
FlowAssembler assembler = new FlowAssembler(builder, flowBuilderContext);
return assembler.assembleFlow();
}
/**
* Subclasses may override this hook to customize the builder context for the flow being tested. Useful for
* registering mock subflows or other {@link FlowBuilderServices flow builder services}. By default, this method
* does nothing.
* @param builderContext the mock flow builder context to configure
*/
protected void configureFlowBuilderContext(MockFlowBuilderContext builderContext) {
}
/**
* Returns a reference to the flow definition registry used by the flow being tested to load subflows. Allows late
* registration of dependent subflows on a per test-case basis. This is an alternative to registering such subflows
* upfront in {@link #configureFlowBuilderContext(MockFlowBuilderContext)}.
* @return the flow definition registry
*/
protected FlowDefinitionRegistry getFlowDefinitionRegistry() {
return (FlowDefinitionRegistry) flowBuilderContext.getFlowDefinitionLocator();
}
/**
* Get the resource defining the flow to be tested.
* @param resourceFactory a helper for constructing the resource to be tested
* @return the flow definition resource
*/
protected abstract FlowDefinitionResource getResource(FlowDefinitionResourceFactory resourceFactory);
/**
* Create the flow builder to build the flow at the specified resource location.
* @param resource the resource location of the flow definition
* @return the flow builder that can build the flow definition
*/
protected abstract FlowBuilder createFlowBuilder(FlowDefinitionResource resource);
// internal helpers
private void init() {
resourceFactory = new FlowDefinitionResourceFactory(createResourceLoader());
}
private FlowExecutionImplFactory getFlowExecutionImplFactory() {
return (FlowExecutionImplFactory) getFlowExecutionFactory();
}
}