Add basic concepts for event bus, and implement in request and model

src/orm/model/events/ModelCreatedEvent.ts

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+import {Model} from '../Model'
+import {ModelEvent} from './ModelEvent'
+
+/**
+ * Event fired right after a model is inserted.
+ */
+export class ModelCreatedEvent<T extends Model<T>> extends ModelEvent<T> {
+
+}

src/orm/model/events/ModelCreatingEvent.ts

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+import {Model} from '../Model'
+import {ModelEvent} from './ModelEvent'
+
+/**
+ * Event fired right before a model is inserted.
+ */
+export class ModelCreatingEvent<T extends Model<T>> extends ModelEvent<T> {
+
+}

src/orm/model/events/ModelDeletedEvent.ts

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+import {Model} from '../Model'
+import {ModelEvent} from './ModelEvent'
+
+/**
+ * Event fired right after a model is deleted.
+ */
+export class ModelDeletedEvent<T extends Model<T>> extends ModelEvent<T> {
+
+}

src/orm/model/events/ModelDeletingEvent.ts

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+import {Model} from '../Model'
+import {ModelEvent} from './ModelEvent'
+
+/**
+ * Event fired right before a model is deleted.
+ */
+export class ModelDeletingEvent<T extends Model<T>> extends ModelEvent<T> {
+
+}

src/orm/model/events/ModelEvent.ts

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+import {Model} from '../Model'
+import {Event} from '../../../event/Event'
+import {JSONState} from '../../../util'
+
+/**
+ * Base class for events that concern an instance of a model.
+ */
+export abstract class ModelEvent<T extends Model<T>> extends Event {
+    /**
+     * The instance of the model.
+     */
+    public instance!: T
+
+    constructor(
+        instance?: T,
+    ) {
+        super()
+        if ( instance ) {
+            this.instance = instance
+        }
+    }
+
+    // TODO implement serialization here
+    dehydrate(): Promise<JSONState> {
+        return Promise.resolve({})
+    }
+
+    rehydrate(/* state: JSONState */): void | Promise<void> {
+        return undefined
+    }
+}

src/orm/model/events/ModelRetrievedEvent.ts

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+import {Model} from '../Model'
+import {ModelEvent} from './ModelEvent'
+
+/**
+ * Event fired right after a model's data is loaded from the source.
+ */
+export class ModelRetrievedEvent<T extends Model<T>> extends ModelEvent<T> {
+
+}

src/orm/model/events/ModelSavedEvent.ts

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+import {Model} from '../Model'
+import {ModelEvent} from './ModelEvent'
+
+/**
+ * Event fired right after a model is persisted to the source.
+ */
+export class ModelSavedEvent<T extends Model<T>> extends ModelEvent<T> {
+
+}

src/orm/model/events/ModelSavingEvent.ts

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+import {Model} from '../Model'
+import {ModelEvent} from './ModelEvent'
+
+/**
+ * Event fired right before a model is persisted to the source.
+ */
+export class ModelSavingEvent<T extends Model<T>> extends ModelEvent<T> {
+
+}

src/orm/model/events/ModelUpdatedEvent.ts

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+import {Model} from '../Model'
+import {ModelEvent} from './ModelEvent'
+
+/**
+ * Event fired right after a model's data is updated.
+ */
+export class ModelUpdatedEvent<T extends Model<T>> extends ModelEvent<T> {
+
+}

src/orm/model/events/ModelUpdatingEvent.ts

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+import {Model} from '../Model'
+import {ModelEvent} from './ModelEvent'
+
+/**
+ * Event fired right before a model's data is updated.
+ */
+export class ModelUpdatingEvent<T extends Model<T>> extends ModelEvent<T> {
+
+}

src/orm/model/events/index.ts

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+import {ModelCreatedEvent} from './ModelCreatedEvent'
+import {ModelUpdatingEvent} from './ModelUpdatingEvent'
+import {ModelCreatingEvent} from './ModelCreatingEvent'
+import {ModelSavedEvent} from './ModelSavedEvent'
+import {ModelDeletedEvent} from './ModelDeletedEvent'
+import {ModelDeletingEvent} from './ModelDeletingEvent'
+import {ModelRetrievedEvent} from './ModelRetrievedEvent'
+import {ModelUpdatedEvent} from './ModelUpdatedEvent'
+import {ModelEvent} from './ModelEvent'
+
+export const ModelEvents = {
+    ModelCreatedEvent,
+    ModelCreatingEvent,
+    ModelDeletedEvent,
+    ModelDeletingEvent,
+    ModelEvent,
+    ModelRetrievedEvent,
+    ModelSavedEvent,
+    ModelUpdatedEvent,
+    ModelUpdatingEvent,
+}