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component.ts
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component.ts
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// Copyright (c) 2023 Sourcefuse Technologies
//
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT
import {
Binding,
Component,
ControllerClass,
CoreBindings,
createBindingFromClass,
inject,
ProviderMap,
ServiceOrProviderClass,
} from '@loopback/core';
import {Class, Model, Repository} from '@loopback/repository';
import {RestApplication} from '@loopback/rest';
import {
WorkflowRepository,
WorkflowServiceBindings,
WorkflowServiceComponent,
WorkflowVersionRepository,
} from '@sourceloop/bpmn-service';
import {
CoreComponent,
SECURITY_SCHEME_SPEC,
ServiceSequence,
} from '@sourceloop/core';
import {AuthenticationComponent} from 'loopback4-authentication';
import {AuthorizationComponent} from 'loopback4-authorization';
import * as controllers from './controllers';
import {TaskServiceBindings} from './keys';
import {CommandObserver, EventStreamObserver} from './lifecycle-observers';
import {Event, EventWorkflow, Task, TaskWorkflow, UserTask} from './models';
import {BpmnProvider} from './providers';
import {SystemUserProvider} from './providers/system-user.provider';
import {
EventRepository,
EventWorkflowRepository,
TaskRepository,
TaskWorkFlowRepository,
UserTaskRepository,
} from './repositories';
import {
EventRepository as EventSequelizeRepository,
EventWorkflowRepository as EventWorkflowSequelizeRepository,
TaskRepository as TaskSequelizeRepository,
TaskWorkFlowRepository as TaskWorkFlowSequelizeRepository,
UserTaskRepository as UserTaskSequelizeRepository,
} from './repositories/sequelize';
import {
CamundaService,
EventProcessorService,
HttpClientService,
UserTaskService,
UtilityService,
} from './services';
import {TaskServiceConfig} from './types';
import {
WorkflowRepository as WorkflowSequelizeRepository,
WorkflowVersionRepository as WorkflowVersionSequelizeRepository,
} from '@sourceloop/bpmn-service/sequelize';
export class TaskServiceComponent implements Component {
repositories?: Class<Repository<Model>>[];
/**
* An optional list of Model classes to bind for dependency injection
* via `app.model()` API.
*/
models?: Class<Model>[];
providers: ProviderMap = {};
services?: ServiceOrProviderClass[];
/**
* An array of controller classes
*/
controllers?: ControllerClass[];
bindings?: Binding[] = [];
constructor(
@inject(CoreBindings.APPLICATION_INSTANCE)
private readonly application: RestApplication,
@inject(TaskServiceBindings.CONFIG, {optional: true})
private readonly config?: TaskServiceConfig,
) {
this.application.component(CoreComponent);
this.application.api({
openapi: '3.0.0',
info: {
title: 'Task Service',
version: '1.0.0',
},
paths: {},
components: {
securitySchemes: SECURITY_SCHEME_SPEC,
},
servers: [{url: '/'}],
});
this.application.component(WorkflowServiceComponent);
this.controllers = [
controllers.EventController,
controllers.TaskController,
controllers.TaskUserTaskController,
];
if (config?.useSequelize) {
this.repositories = [
EventSequelizeRepository,
TaskSequelizeRepository,
EventWorkflowSequelizeRepository,
TaskWorkFlowSequelizeRepository,
UserTaskSequelizeRepository,
WorkflowSequelizeRepository,
WorkflowVersionSequelizeRepository,
];
} else {
this.repositories = [
EventRepository,
TaskRepository,
EventWorkflowRepository,
TaskWorkFlowRepository,
UserTaskRepository,
WorkflowRepository,
WorkflowVersionRepository,
];
}
this.providers = {
[TaskServiceBindings.SYSTEM_USER.key]: SystemUserProvider,
[WorkflowServiceBindings.WorkflowManager.key]: BpmnProvider,
};
this.models = [EventWorkflow, Event, TaskWorkflow, Task, UserTask];
this.services = [CamundaService, UtilityService, HttpClientService];
this.bindings = [
createBindingFromClass(EventProcessorService, {
key: TaskServiceBindings.EVENT_PROCESSOR,
}),
createBindingFromClass(UserTaskService, {
key: TaskServiceBindings.SUB_TASK_SERVICE,
}),
];
if (!this.config?.useCustomSequence) {
this.setupSequence();
}
// default filter does not skip any events
this.application.bind(TaskServiceBindings.EVENT_FILTER).to(() => true);
this.application.lifeCycleObserver(EventStreamObserver);
this.application.lifeCycleObserver(CommandObserver);
}
/**
* Setup ServiceSequence by default if no other sequnce provided
*/
setupSequence() {
this.application.component(AuthenticationComponent);
this.application.component(AuthorizationComponent);
this.application.sequence(ServiceSequence);
}
}