implementation of server synchronization

src/app/core/cache/server-sync-buffer.actions.ts

@@ -0,0 +1,83 @@
+import { Action } from '@ngrx/store';
+
+import { type } from '../../shared/ngrx/type';
+import { CacheableObject } from './object-cache.reducer';
+import { Operation } from 'fast-json-patch';
+import { RestRequest, RestRequestMethod } from '../data/request.models';
+
+/**
+ * The list of ServerSyncBufferAction type definitions
+ */
+export const ServerSyncBufferActionTypes = {
+  ADD: type('dspace/core/cache/syncbuffer/ADD'),
+  COMMIT: type('dspace/core/cache/syncbuffer/COMMIT'),
+  EMPTY: type('dspace/core/cache/syncbuffer/EMPTY'),
+};
+
+/* tslint:disable:max-classes-per-file */
+
+/**
+ * An ngrx action to add a new cached object to the server's sync buffer
+ */
+export class AddToSSBAction implements Action {
+  type = ServerSyncBufferActionTypes.ADD;
+  payload: {
+    href: string,
+    method: RestRequestMethod
+  };
+
+  /**
+   * Create a new AddToSSBAction
+   *
+   * @param href
+   *    the unique href of the cached object entry that should be updated
+   */
+  constructor(href: string, method: RestRequestMethod) {
+    this.payload = { href, method };
+  }
+}
+
+/**
+ * An ngrx action to commit everything (for a certain method, when specified) in the ServerSyncBuffer to the server
+ */
+export class CommitSSBAction implements Action {
+  type = ServerSyncBufferActionTypes.COMMIT;
+  payload?: RestRequestMethod;
+
+  /**
+   * Create a new CommitSSBAction
+   *
+   * @param method
+   *    an optional method for which the ServerSyncBuffer should send its entries to the server
+   */
+  constructor(method?: RestRequestMethod) {
+    this.payload = method;
+  }
+}
+/**
+ * An ngrx action to remove everything (for a certain method, when specified) from the ServerSyncBuffer to the server
+ */
+export class EmptySSBAction implements Action {
+  type = ServerSyncBufferActionTypes.EMPTY;
+  payload?: RestRequestMethod;
+
+  /**
+   * Create a new EmptySSBAction
+   *
+   * @param method
+   *    an optional method for which the ServerSyncBuffer should remove its entries
+   */
+  constructor(method?: RestRequestMethod) {
+    this.payload = method;
+  }
+}
+
+/* tslint:enable:max-classes-per-file */
+
+/**
+ * A type to encompass all ServerSyncBufferActions
+ */
+export type ServerSyncBufferAction
+  = AddToSSBAction
+  | CommitSSBAction
+  | EmptySSBAction