add data source

src/app/app.module.ts

@@ -1,10 +1,49 @@
 import { BrowserModule } from '@angular/platform-browser';
-import { NgModule } from '@angular/core';
+import { NgModule, APP_INITIALIZER } from '@angular/core';
 
 import { AppRoutingModule } from './app-routing.module';
 import { AppComponent } from './app.component';
 import { HomeComponent } from './home/home.component';
 
+import { Apollo, ApolloModule } from 'apollo-angular';
+import { HttpLink, HttpLinkModule } from 'apollo-angular-link-http';
+import { DefaultOptions } from 'apollo-client';
+import { InMemoryCache } from 'apollo-cache-inmemory';
+import { HttpClientModule } from '@angular/common/http';
+
+export function app_Init(apollo: Apollo, httpLink: HttpLink) {
+  return async () => {
+    const defaultOptions: DefaultOptions = {
+      watchQuery: {
+        fetchPolicy: 'no-cache',
+        errorPolicy: 'ignore',
+      },
+      query: {
+        fetchPolicy: 'network-only',
+        errorPolicy: 'all',
+      },
+      mutate: {
+        fetchPolicy: 'no-cache',
+      },
+    };
+
+    apollo.createDefault({
+      link: httpLink.create({ uri: 'https://localhost:5001' }),
+      cache: new InMemoryCache(),
+      defaultOptions: defaultOptions,
+    });
+
+    apollo.createNamed('command', {
+      link: httpLink.create({ uri: 'https://localhost:6001' }),
+      cache: new InMemoryCache(),
+      defaultOptions: defaultOptions,
+    });
+
+    return new Promise((resolve, reject) => {
+      resolve();
+    });
+  };
+}
 
 @NgModule({
   declarations: [
@@ -14,9 +53,19 @@ import { HomeComponent } from './home/home.component';
   ],
   imports: [
     BrowserModule,
-    AppRoutingModule
+    AppRoutingModule,
+    HttpClientModule,
+    ApolloModule,
+    HttpLinkModule
+  ],
+  providers: [
+    {
+      provide: APP_INITIALIZER,
+      useFactory: app_Init,
+      deps: [Apollo, HttpLink],
+      multi: true,
+    },
   ],
-  providers: [],
   bootstrap: [AppComponent]
 })
 export class AppModule { }

src/app/data/services/merchant.service.ts

@@ -0,0 +1,36 @@
+import { Injectable } from '@angular/core';
+import { GraphQLDataSourceService } from '@poweredsoft/ngx-data-apollo';
+import { IDataSource, DataSource } from '@poweredsoft/data';
+
+export interface IMerchant{
+  id: string,
+  name: string,
+  address: string
+}
+
+@Injectable({
+  providedIn: 'root'
+})
+export class MerchantService {
+
+  constructor(private dataSourceGenericService: GraphQLDataSourceService) {
+
+    dataSourceGenericService
+  }
+
+  createMerchantDataSource() : IDataSource<IMerchant> {
+    const optionsBuilder = this.dataSourceGenericService.createDataSourceOptionsBuilder<IMerchant, string>(
+      'merchants',
+      'GraphQLAdvanceQueryOfMerchantInput',
+      'id, name, address',
+      (model) => model.id,
+      {
+        page: 1,
+        pageSize: 4
+      }, 
+      true
+    );
+    const options = optionsBuilder.create();
+    return new DataSource<IMerchant>(options);
+  }
+}