Provides a main framework for custom scripting

src/main/java/sirius/biz/scripting/CustomEvent.java

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+/*
+ * Made with all the love in the world
+ * by scireum in Remshalden, Germany
+ *
+ * Copyright by scireum GmbH
+ * http://www.scireum.de - info@scireum.de
+ */
+
+package sirius.biz.scripting;
+
+import sirius.kernel.health.HandledException;
+
+import java.util.Optional;
+
+/**
+ * Provides a base class for all custom events handled by a {@link CustomEventDispatcher}.
+ */
+public abstract class CustomEvent {
+
+ protected boolean success;
+ protected boolean failed;
+ protected HandledException error;
+
+ /**
+ * Determines if the event was successful.
+ *
+ * @return <tt>true</tt> if the event was successful, <tt>false</tt> otherwise
+ */
+ public boolean isSuccess() {
+ return success;
+ }
+
+ /**
+ * Determines if the event failed (an exception occurred within an event handler).
+ * <p>
+ * Note, that the exception itself can be obtained via {@link #getError()}.
+ *
+ * @return <tt>true</tt> if the event failed, <tt>false</tt> otherwise
+ */
+ public boolean isFailed() {
+ return failed;
+ }
+
+ /**
+ * Provides the error which occurred when handling the event.
+ *
+ * @return the error that occurred wrapped as optional or an empty optional if the event was successful
+ */
+ public Optional<HandledException> getError() {
+ return Optional.ofNullable(error);
+ }
+}

src/main/java/sirius/biz/scripting/CustomEventDispatcher.java

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+/*
+ * Made with all the love in the world
+ * by scireum in Remshalden, Germany
+ *
+ * Copyright by scireum GmbH
+ * http://www.scireum.de - info@scireum.de
+ */
+
+package sirius.biz.scripting;
+
+/**
+ * Describes a dispatcher which can handle custom events.
+ * <p>
+ * This is usually fetched via {@link CustomEvents} and will handle all events for a given tenant,
+ * based on a given script. If no custom handling script is present, a <tt>NOOP</tt> dispatcher is used
+ * which will be marked as {@link #isActive() inactive} (so that some events might get optimized away).
+ */
+public interface CustomEventDispatcher {
+
+ /**
+ * Determines if this dispatcher is active and will actually handle events.
+ *
+ * @return <tt>true</tt> if a real dispatcher is present, <tt>false</tt> if a <tt>NOOP</tt> dispatcher is used
+ */
+ boolean isActive();
+
+ /**
+ * Handles the given event.
+ *
+ * @param event the event to handle
+ */
+ void handleEvent(CustomEvent event);
+}

src/main/java/sirius/biz/scripting/CustomEventDispatcherRepository.java

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+/*
+ * Made with all the love in the world
+ * by scireum in Remshalden, Germany
+ *
+ * Copyright by scireum GmbH
+ * http://www.scireum.de - info@scireum.de
+ */
+
+package sirius.biz.scripting;
+
+import sirius.kernel.di.std.AutoRegister;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Provides a repository which stores and manages {@link CustomEventDispatcher custom event dispatchers}.
+ * <p>
+ * Note that the repository isn't usually accessed directly. Instead, the {@link CustomEvents} class should be used.
+ */
+@AutoRegister
+public interface CustomEventDispatcherRepository {
+
+ /**
+ * Fetches all available dispatchers for the given tenant.
+ *
+ * @param tenantId the tenant for which to fetch the dispatchers
+ * @return a list of all available dispatchers for the given tenant
+ */
+ List<String> fetchAvailableDispatchers(@Nonnull String tenantId);
+
+ /**
+ * Fetches the dispatcher with the given name for the given tenant.
+ *
+ * @param tenantId the tenant for which to fetch the dispatcher
+ * @param name the name of the dispatcher to fetch
+ * @return the dispatcher with the given name for the given tenant wrapped as optional or an empty optional if
+ * no such dispatcher exists. <b>NOTE:</b> if an empty name is given, the first dispatcher for the given tenant
+ * is used. This helps to simplify the usage of custom events.
+ */
+ Optional<CustomEventDispatcher> fetchDispatcher(@Nonnull String tenantId, @Nullable String name);
+}

src/main/java/sirius/biz/scripting/CustomEventRegistry.java

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+/*
+ * Made with all the love in the world
+ * by scireum in Remshalden, Germany
+ *
+ * Copyright by scireum GmbH
+ * http://www.scireum.de - info@scireum.de
+ */
+
+package sirius.biz.scripting;
+
+import sirius.kernel.commons.Callback;
+
+/**
+ * Provides the interface as seen by the scripting engine to register custom event handlers.
+ * <p>
+ * The tenant specific script is provided with an instance of this registry and can then add handlers
+ * as needed.
+ */
+public interface CustomEventRegistry {
+
+ /**
+ * Adds a handler for the given event type.
+ *
+ * @param eventType the type of events to handle
+ * @param handler the handler to handle the event
+ * @param <E> the generic type of the event
+ */
+ <E extends CustomEvent> void registerHandler(Class<E> eventType, Callback<E> handler);
+
+ /**
+ * Adds a typed handler for the given event type and inner type
+ *
+ * @param eventType the type of events to handle
+ * @param type the inner type within the event to process
+ * @param handler the handler to handle the event
+ * @param <T> the generic inner type of the event
+ * @param <E> the generic type of the event
+ */
+ <T, E extends TypedCustomEvent<T>> void registerTypedHandler(Class<E> eventType,
+ Class<T> type,
+ Callback<E> handler);
+}

src/main/java/sirius/biz/scripting/CustomEvents.java

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+/*
+ * Made with all the love in the world
+ * by scireum in Remshalden, Germany
+ *
+ * Copyright by scireum GmbH
+ * http://www.scireum.de - info@scireum.de
+ */
+
+package sirius.biz.scripting;
+
+import sirius.kernel.di.std.Part;
+import sirius.kernel.di.std.Register;
+import sirius.web.security.ScopeInfo;
+import sirius.web.security.UserContext;
+import sirius.web.security.UserInfo;
+
+import javax.annotation.Nullable;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Provides access to tenant specific custom event dispatchers.
+ * <p>
+ * Event dispatchers are stored and managed by a {@link CustomEventDispatcherRepository}. Commonly these are
+ * defined via scripts which modify a {@link CustomEventRegistry} and are then transformed into a
+ * {@link CustomEventDispatcher} with the help of a {@link ScriptBasedCustomEventDispatcher}.
+ */
+@Register(classes = CustomEvents.class)
+public class CustomEvents {
+
+ private static final CustomEventDispatcher NOOP_DISPATCHER = new CustomEventDispatcher() {
+
+ @Override
+ public boolean isActive() {
+ return false;
+ }
+
+ @Override
+ public void handleEvent(CustomEvent event) {
+ // do nothing
+ }
+ };
+
+ @Part
+ @Nullable
+ private CustomEventDispatcherRepository dispatcherRepository;
+
+ /**
+ * Fetches the dispatcher for the current tenant.
+ *
+ * @param name the name of the dispatcher to fetch
+ * @return the dispatcher for the current tenant with the given name or a NOOP dispatcher if no such dispatcher
+ * exists. Note, if an empty <tt>name</tt> is given, the first available dispatcher for the current tenant is used.
+ * This way, if exactly one dispatcher is present, it will be used in all import processes etc.
+ */
+ public CustomEventDispatcher fetchDispatcherForCurrentTenant(@Nullable String name) {
+ if (dispatcherRepository == null) {
+ return NOOP_DISPATCHER;
+ }
+
+ if (!ScopeInfo.DEFAULT_SCOPE.getScopeType().equals(UserContext.getCurrentScope().getScopeType())) {
+ return NOOP_DISPATCHER;
+ }
+
+ UserInfo currentUser = UserContext.getCurrentUser();
+ if (!currentUser.isLoggedIn()) {
+ return NOOP_DISPATCHER;
+ }
+
+ return dispatcherRepository.fetchDispatcher(currentUser.getTenantId(), name).orElse(NOOP_DISPATCHER);
+ }
+
+ /**
+ * Fetches all available dispatchers for the current tenant.
+ *
+ * @return a list of all available dispatchers for the current tenant
+ */
+ public List<String> fetchDispatchersForCurrentTenant() {
+ if (dispatcherRepository == null) {
+ return Collections.emptyList();
+ }
+ if (!ScopeInfo.DEFAULT_SCOPE.getScopeType().equals(UserContext.getCurrentScope().getScopeType())) {
+ return Collections.emptyList();
+ }
+
+ UserInfo currentUser = UserContext.getCurrentUser();
+ if (!currentUser.isLoggedIn()) {
+ return Collections.emptyList();
+ }
+
+ return dispatcherRepository.fetchAvailableDispatchers(currentUser.getTenantId());
+ }
+}

src/main/java/sirius/biz/scripting/EntityCustomEvent.java

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+/*
+ * Made with all the love in the world
+ * by scireum in Remshalden, Germany
+ *
+ * Copyright by scireum GmbH
+ * http://www.scireum.de - info@scireum.de
+ */
+
+package sirius.biz.scripting;
+
+import sirius.db.mixing.Entity;
+
+/**
+ * Provides a base class for all custom events which are associated with an entity.
+ *
+ * @param <E> the generic type of the entity
+ */
+public abstract class EntityCustomEvent<E extends Entity> extends TypedCustomEvent<E> {
+
+ private final E entity;
+
+ protected EntityCustomEvent(E entity) {
+ this.entity = entity;
+ }
+
+ /**
+ * Returns the entity associated with this event.
+ *
+ * @return the entity associated with this event
+ */
+ public E getEntity() {
+ return entity;
+ }
+
+ @SuppressWarnings("unchecked")
+ @Override
+ public Class<E> getType() {
+ return (Class<E>) entity.getClass();
+ }
+}