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How to use StepInterceptorImpl class of com.tngtech.jgiven.impl.intercept package

Best JGiven code snippet using com.tngtech.jgiven.impl.intercept.StepInterceptorImpl

Source:ScenarioExecutor.java

...15import com.tngtech.jgiven.impl.inject.ValueInjector;16import com.tngtech.jgiven.impl.intercept.NoOpScenarioListener;17import com.tngtech.jgiven.impl.intercept.ScenarioListener;18import com.tngtech.jgiven.impl.intercept.StageTransitionHandler;19import com.tngtech.jgiven.impl.intercept.StepInterceptorImpl;20import com.tngtech.jgiven.impl.util.FieldCache;21import com.tngtech.jgiven.impl.util.ReflectionUtil;22import com.tngtech.jgiven.integration.CanWire;23import com.tngtech.jgiven.report.model.InvocationMode;24import com.tngtech.jgiven.report.model.NamedArgument;25import java.lang.annotation.Annotation;26import java.lang.reflect.Field;27import java.lang.reflect.Method;28import java.util.ArrayList;29import java.util.LinkedHashMap;30import java.util.List;31import java.util.Map;32import java.util.Optional;33import org.slf4j.Logger;34import org.slf4j.LoggerFactory;35/**36 * Main class of JGiven for executing scenarios.37 */38public class ScenarioExecutor {39    private static final Logger log = LoggerFactory.getLogger(ScenarioExecutor.class);40    enum State {41        INIT,42        STARTED,43        FINISHED44    }45    private Object currentTopLevelStage;46    private State state = State.INIT;47    private boolean beforeScenarioMethodsExecuted;48    /**49     * Whether life cycle methods should be executed.50     * This is only false for scenarios that are annotated with @NotImplementedYet51     */52    private boolean executeLifeCycleMethods = true;53    protected final Map<Class<?>, StageState> stages = new LinkedHashMap<>();54    private final List<Object> scenarioRules = new ArrayList<>();55    private final ValueInjector injector = new ValueInjector();56    private StageCreator stageCreator = createStageCreator(new ByteBuddyStageClassCreator());57    private ScenarioListener listener = new NoOpScenarioListener();58    protected final StageTransitionHandler stageTransitionHandler = new StageTransitionHandlerImpl();59    protected final StepInterceptorImpl methodInterceptor =60        new StepInterceptorImpl(this, listener, stageTransitionHandler);61    /**62     * Set if an exception was thrown during the execution of the scenario and63     * suppressStepExceptions is true.64     */65    private Throwable failedException;66    private boolean failIfPass;67    /**68     * Whether exceptions caught while executing steps should be thrown at the end69     * of the scenario. Only relevant if suppressStepExceptions is true, because otherwise70     * the exceptions are not caught at all.71     */72    private boolean suppressExceptions;73    /**74     * Whether exceptions thrown while executing steps should be suppressed or not.75     * Only relevant for normal executions of scenarios.76     */77    private boolean suppressStepExceptions = true;78    /**79     * Create a new ScenarioExecutor instance.80     */81    public ScenarioExecutor() {82        injector.injectValueByType(ScenarioExecutor.class, this);83        injector.injectValueByType(CurrentStep.class, new StepAccessImpl());84        injector.injectValueByType(CurrentScenario.class, new ScenarioAccessImpl());85    }86    class StepAccessImpl implements CurrentStep {87        @Override88        public void addAttachment(Attachment attachment) {89            listener.attachmentAdded(attachment);90        }91        @Override92        public void setExtendedDescription(String extendedDescription) {93            listener.extendedDescriptionUpdated(extendedDescription);94        }95        @Override96        public void setName(String name) {97            listener.stepNameUpdated(name);98        }99        @Override100        public void setComment(String comment) {101            listener.stepCommentUpdated(comment);102        }103    }104    class ScenarioAccessImpl implements CurrentScenario {105        @Override106        public void addTag(Class<? extends Annotation> annotationClass, String... values) {107            listener.tagAdded(annotationClass, values);108        }109    }110    class StageTransitionHandlerImpl implements StageTransitionHandler {111        @Override112        public void enterStage(Object parentStage, Object childStage) throws Throwable {113            if (parentStage == childStage || currentTopLevelStage == childStage) { // NOSONAR: reference comparison OK114                return;115            }116            // if currentStage == null, this means that no stage at117            // all has been executed, thus we call all beforeScenarioMethods118            if (currentTopLevelStage == null) {119                ensureBeforeScenarioMethodsAreExecuted();120            } else {121                // in case parentStage == null, this is the first top-level122                // call on this stage, thus we have to call the afterStage methods123                // from the current top level stage124                if (parentStage == null) {125                    executeAfterStageMethods(currentTopLevelStage);126                    readScenarioState(currentTopLevelStage);127                } else {128                    // as the parent stage is not null, we have a true child call129                    // thus we have to read the state from the parent stage130                    readScenarioState(parentStage);131                    // if there has been a child stage that was executed before132                    // and the new child stage is different, we have to execute133                    // the after stage methods of the previous child stage134                    StageState stageState = getStageState(parentStage);135                    if (stageState.currentChildStage != null && stageState.currentChildStage != childStage136                        && !afterStageMethodsCalled(stageState.currentChildStage)) {137                        updateScenarioState(stageState.currentChildStage);138                        executeAfterStageMethods(stageState.currentChildStage);139                        readScenarioState(stageState.currentChildStage);140                    }141                    stageState.currentChildStage = childStage;142                }143            }144            updateScenarioState(childStage);145            executeBeforeStageMethods(childStage);146            if (parentStage == null) {147                currentTopLevelStage = childStage;148            }149        }150        @Override151        public void leaveStage(Object parentStage, Object childStage) throws Throwable {152            if (parentStage == childStage || parentStage == null) {153                return;154            }155            readScenarioState(childStage);156            // in case we leave a child stage that itself had a child stage157            // we have to execute the after stage method of that transitive child158            StageState childState = getStageState(childStage);159            if (childState.currentChildStage != null) {160                updateScenarioState(childState.currentChildStage);161                if (!getStageState(childState.currentChildStage).allAfterStageMethodsHaveBeenExecuted()) {162                    executeAfterStageMethods(childState.currentChildStage);163                    readScenarioState(childState.currentChildStage);164                    updateScenarioState(childStage);165                }166                childState.currentChildStage = null;167            }168            updateScenarioState(parentStage);169        }170    }171    @SuppressWarnings("unchecked")172    <T> T addStage(Class<T> stageClass) {173        if (stages.containsKey(stageClass)) {174            return (T) stages.get(stageClass).instance;175        }176        T result = stageCreator.createStage(stageClass, methodInterceptor);177        methodInterceptor.enableMethodInterception(true);178        stages.put(stageClass, new StageState(result, methodInterceptor));179        gatherRules(result);180        injectStages(result);181        return result;182    }183    public void addIntroWord(String word) {184        listener.introWordAdded(word);185    }186    @SuppressWarnings("unchecked")187    private void gatherRules(Object stage) {188        for (Field field : FieldCache.get(stage.getClass()).getFieldsWithAnnotation(ScenarioRule.class)) {189            log.debug("Found rule in field {} ", field);190            try {191                scenarioRules.add(field.get(stage));192            } catch (IllegalAccessException e) {193                throw new RuntimeException("Error while reading field " + field, e);194            }195        }196    }197    private <T> void updateScenarioState(T t) {198        try {199            injector.updateValues(t);200        } catch (JGivenMissingRequiredScenarioStateException e) {201            if (!suppressExceptions) {202                throw e;203            }204        }205    }206    private boolean afterStageMethodsCalled(Object stage) {207        return getStageState(stage).allAfterStageMethodsHaveBeenExecuted();208    }209    //TODO: nicer stage search?210    // What may happen if there is a common superclass to two distinct implementations? Is that even possible?211    StageState getStageState(Object stage) {212        Class<?> stageClass = stage.getClass();213        StageState stageState = stages.get(stageClass);214        while (stageState == null && stageClass != stageClass.getSuperclass()) {215            stageState = stages.get(stageClass);216            stageClass = stageClass.getSuperclass();217        }218        return stageState;219    }220    private void ensureBeforeScenarioMethodsAreExecuted() throws Throwable {221        if (state != State.INIT) {222            return;223        }224        state = STARTED;225        methodInterceptor.enableMethodInterception(false);226        try {227            for (Object rule : scenarioRules) {228                invokeRuleMethod(rule, "before");229            }230            beforeScenarioMethodsExecuted = true;231            for (StageState stage : stages.values()) {232                executeBeforeScenarioMethods(stage.instance);233            }234        } catch (Throwable e) {235            failed(e);236            finished();237            throw e;238        }239        methodInterceptor.enableMethodInterception(true);240    }241    private void invokeRuleMethod(Object rule, String methodName) throws Throwable {242        if (!executeLifeCycleMethods) {243            return;244        }245        Optional<Method> optionalMethod = ReflectionUtil.findMethodTransitively(rule.getClass(), methodName);246        if (!optionalMethod.isPresent()) {247            log.debug("Class {} has no {} method, but was used as ScenarioRule!", rule.getClass(), methodName);248            return;249        }250        try {251            ReflectionUtil.invokeMethod(rule, optionalMethod.get(), " of rule class " + rule.getClass().getName());252        } catch (JGivenUserException e) {253            throw e.getCause();254        }255    }256    private void executeBeforeScenarioMethods(Object stage) throws Throwable {257        getStageState(stage).executeBeforeScenarioMethods(!executeLifeCycleMethods);258    }259    private void executeBeforeStageMethods(Object stage) throws Throwable {260        getStageState(stage).executeBeforeStageMethods(!executeLifeCycleMethods);261    }262    private void executeAfterStageMethods(Object stage) throws Throwable {263        getStageState(stage).executeAfterStageMethods(!executeLifeCycleMethods);264    }265    private void executeAfterScenarioMethods(Object stage) throws Throwable {266        getStageState(stage).executeAfterScenarioMethods(!executeLifeCycleMethods);267    }268    public void readScenarioState(Object object) {269        injector.readValues(object);270    }271    /**272     * Used for DI frameworks to inject values into stages.273     */274    public void wireSteps(CanWire canWire) {275        for (StageState steps : stages.values()) {276            canWire.wire(steps.instance);277        }278    }279    /**280     * Has to be called when the scenario is finished in order to execute after methods.281     */282    public void finished() throws Throwable {283        if (state == FINISHED) {284            return;285        }286        State previousState = state;287        state = FINISHED;288        methodInterceptor.enableMethodInterception(false);289        try {290            if (previousState == STARTED) {291                callFinishLifeCycleMethods();292            }293        } finally {294            listener.scenarioFinished();295        }296    }297    private void callFinishLifeCycleMethods() throws Throwable {298        Throwable firstThrownException = failedException;299        if (beforeScenarioMethodsExecuted) {300            try {301                if (currentTopLevelStage != null) {302                    executeAfterStageMethods(currentTopLevelStage);303                }304            } catch (Exception e) {305                firstThrownException = logAndGetFirstException(firstThrownException, e);306            }307            for (StageState stage : reverse(newArrayList(stages.values()))) {308                try {309                    executeAfterScenarioMethods(stage.instance);310                } catch (Exception e) {311                    firstThrownException = logAndGetFirstException(firstThrownException, e);312                }313            }314        }315        for (Object rule : reverse(scenarioRules)) {316            try {317                invokeRuleMethod(rule, "after");318            } catch (Exception e) {319                firstThrownException = logAndGetFirstException(firstThrownException, e);320            }321        }322        failedException = firstThrownException;323        if (!suppressExceptions && failedException != null) {324            throw failedException;325        }326        if (failIfPass && failedException == null) {327            throw new FailIfPassedException();328        }329    }330    private Throwable logAndGetFirstException(Throwable firstThrownException, Throwable newException) {331        log.error(newException.getMessage(), newException);332        return firstThrownException == null ? newException : firstThrownException;333    }334    /**335     * Initialize the fields annotated with {@link ScenarioStage} in the test class.336     */337    @SuppressWarnings("unchecked")338    public void injectStages(Object stage) {339        for (Field field : FieldCache.get(stage.getClass()).getFieldsWithAnnotation(ScenarioStage.class)) {340            Object steps = addStage(field.getType());341            ReflectionUtil.setField(field, stage, steps, ", annotated with @ScenarioStage");342        }343    }344    public boolean hasFailed() {345        return failedException != null;346    }347    public Throwable getFailedException() {348        return failedException;349    }350    public void setFailedException(Exception e) {351        failedException = e;352    }353    /**354     * Handle ocurred exception and continue.355     */356    public void failed(Throwable e) {357        if (hasFailed()) {358            log.error(e.getMessage(), e);359        } else {360            if (!failIfPass) {361                listener.scenarioFailed(e);362            }363            methodInterceptor.disableMethodExecution();364            failedException = e;365        }366    }367    /**368     * Starts a scenario with the given description.369     *370     * @param description the description of the scenario371     */372    public void startScenario(String description) {373        listener.scenarioStarted(description);374    }375    /**376     * Starts the scenario with the given method and arguments.377     * Derives the description from the method name.378     *379     * @param method    the method that started the scenario380     * @param arguments the test arguments with their parameter names381     */382    public void startScenario(Class<?> testClass, Method method, List<NamedArgument> arguments) {383        listener.scenarioStarted(testClass, method, arguments);384        if (Config.config().dryRun()) {385            methodInterceptor.setDefaultInvocationMode(InvocationMode.PENDING);386            methodInterceptor.disableMethodExecution();387            executeLifeCycleMethods = false;388            suppressExceptions = true;389        } else {390            Pending annotation = extractPendingAnnotation(method);391            if (annotation == null) {392                methodInterceptor.setSuppressExceptions(suppressStepExceptions);393            } else {394                if (annotation.failIfPass()) {395                    failIfPass();396                } else {397                    methodInterceptor.setDefaultInvocationMode(InvocationMode.PENDING);398                    if (!annotation.executeSteps()) {399                        methodInterceptor.disableMethodExecution();400                        executeLifeCycleMethods = false;401                    }402                }403                suppressExceptions = true;404            }405        }406    }407    private Pending extractPendingAnnotation(Method method) {408        if (method.isAnnotationPresent(Pending.class)) {409            return method.getAnnotation(Pending.class);410        }411        if (method.getDeclaringClass().isAnnotationPresent(Pending.class)) {412            return method.getDeclaringClass().getAnnotation(Pending.class);413        }414        return null;415    }416    public void setListener(ScenarioListener listener) {417        this.listener = listener;418        methodInterceptor.setScenarioListener(listener);419    }420    public void failIfPass() {421        failIfPass = true;422    }423    public void setSuppressStepExceptions(boolean suppressStepExceptions) {424        this.suppressStepExceptions = suppressStepExceptions;425    }426    public void setSuppressExceptions(boolean suppressExceptions) {427        this.suppressExceptions = suppressExceptions;428    }429    public void addSection(String sectionTitle) {430        listener.sectionAdded(sectionTitle);431    }432    public void setStageCreator(StageCreator stageCreator) {433        this.stageCreator = stageCreator;434    }435    public void setStageClassCreator(StageClassCreator stageClassCreator) {436        this.stageCreator = createStageCreator(stageClassCreator);437    }438    private StageCreator createStageCreator(StageClassCreator stageClassCreator) {439        return new DefaultStageCreator(new CachingStageClassCreator(stageClassCreator));440    }441    private static class StageState extends StageLifecycleManager {442        final Object instance;443        Object currentChildStage;444        private StageState(Object instance, StepInterceptorImpl methodInterceptor) {445            super(instance, methodInterceptor);446            this.instance = instance;447        }448    }449}...

Source:StepInterceptorImpl.java

...16import com.tngtech.jgiven.impl.ScenarioExecutor;17import com.tngtech.jgiven.impl.util.ParameterNameUtil;18import com.tngtech.jgiven.report.model.InvocationMode;19import com.tngtech.jgiven.report.model.NamedArgument;20public class StepInterceptorImpl implements StepInterceptor {21    private static final Logger log = LoggerFactory.getLogger( StepInterceptorImpl.class );22    private static final int INITIAL_MAX_STEP_DEPTH = 1;23    private ScenarioExecutor scenarioExecutor;24    private StageTransitionHandler stageTransitionHandler;25    private ScenarioListener listener;26    /**27     * Contains the stack of call receivers. This is used to update28     * the state of a parent stage after a call to a child stage has returned29     */30    protected final Stack<Object> stageStack = new Stack<Object>();31    private int maxStepDepth = INITIAL_MAX_STEP_DEPTH;32    private InvocationMode defaultInvocationMode = InvocationMode.NORMAL;33    /**34     * Whether methods should be intercepted or not35     */36    private boolean interceptingEnabled;37    /**38     * Whether step methods are actually executed or just skipped39     */40    private boolean methodExecutionEnabled = true;41    /**42     * Whether all exceptions should be suppressed and not be rethrown43     */44    private boolean suppressExceptions = true;45    public StepInterceptorImpl(ScenarioExecutor scenarioExecutor, ScenarioListener listener, StageTransitionHandler stageTransitionHandler) {46        this.scenarioExecutor = scenarioExecutor;47        this.listener = listener;48        this.stageTransitionHandler = stageTransitionHandler;49    }50    public final Object intercept( final Object receiver, Method method, final Object[] parameters, Invoker invoker ) throws Throwable {51        if( !shouldInterceptMethod( method ) ) {52            return invoker.proceed();53        }54        int currentStackDepth = stageStack.size();55        Object parentStage = null;56        if( !stageStack.isEmpty() ) {57            parentStage = stageStack.peek();58        }59        stageStack.push( receiver );...

Source:StageLifecycleManagerTest.java

...3import com.tngtech.jgiven.annotation.AfterScenario;4import com.tngtech.jgiven.annotation.AfterStage;5import com.tngtech.jgiven.annotation.BeforeScenario;6import com.tngtech.jgiven.annotation.BeforeStage;7import com.tngtech.jgiven.impl.intercept.StepInterceptorImpl;8import org.junit.Test;9public class StageLifecycleManagerTest {10    private final StepInterceptorImpl mockInterceptor = new StepInterceptorImpl(null, null, null);11    private LifecycleMethodContainer methodContainer = new LifecycleMethodContainer();12    private StageLifecycleManager underTest = new StageLifecycleManager(methodContainer, mockInterceptor);13    @Test14    public void exectuesAnnotatedMethodRepeatedly() throws Throwable {15        executeAllLifecycleMethods(underTest, false);16        executeAllLifecycleMethods(underTest, false);17        assertThat(methodContainer.repeatableBeforeMethodInvoked).isEqualTo(2);18        assertThat(methodContainer.repeatableAfterMethodInvoked).isEqualTo(2);19    }20    @Test21    public void exectuesNonAnnotatedMethodOnlyOnce() throws Throwable {22        executeAllLifecycleMethods(underTest, false);23        executeAllLifecycleMethods(underTest, false);24        assertThat(methodContainer.beforeScenarioMethodInvoked).isEqualTo(1);...

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