# All files / local memory_persistence.ts

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     /**
     * Copyright 2017 Google Inc.
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    import { User } from '../auth/user';
    import { assert } from '../util/assert';
    import { debug } from '../util/log';

    import { MemoryMutationQueue } from './memory_mutation_queue';
    import { MemoryQueryCache } from './memory_query_cache';
    import { MemoryRemoteDocumentCache } from './memory_remote_document_cache';
    import { MutationQueue } from './mutation_queue';
    import { Persistence, PersistenceTransaction } from './persistence';
    import { PersistencePromise } from './persistence_promise';
    import { QueryCache } from './query_cache';
    import { RemoteDocumentCache } from './remote_document_cache';

    const LOG_TAG = 'MemoryPersistence';

    /**
     * A memory-backed instance of Persistence. Data is stored only in RAM and
     * not persisted across sessions.
     */
    export class MemoryPersistence implements Persistence {
      /**
       * Note that these are retained here to make it easier to write tests
       * affecting both the in-memory and IndexedDB-backed persistence layers. Tests
       * can create a new LocalStore wrapping this Persistence instance and this
       * will make the in-memory persistence layer behave as if it were actually
       * persisting values.
       */
      private mutationQueues: { [user: string]: MutationQueue } = {};
      private remoteDocumentCache = new MemoryRemoteDocumentCache();
      private queryCache = new MemoryQueryCache();

      private started = false;

      async start(): Promise<void> {
        // No durable state to read on startup.
        assert(!this.started, 'MemoryPersistence double-started!');
        this.started = true;
      }

      async shutdown(): Promise<void> {
        // No durable state to ensure is closed on shutdown.
        assert(this.started, 'MemoryPersistence shutdown without start!');
        this.started = false;
      }

      getMutationQueue(user: User): MutationQueue {
        let queue = this.mutationQueues[user.toKey()];
        if (!queue) {
          queue = new MemoryMutationQueue();
          this.mutationQueues[user.toKey()] = queue;
        }
        return queue;
      }

      getQueryCache(): QueryCache {
        return this.queryCache;
      }

      getRemoteDocumentCache(): RemoteDocumentCache {
        return this.remoteDocumentCache;
      }

      runTransaction<T>(
        action: string,
        operation: (transaction: PersistenceTransaction) => PersistencePromise<T>
      ): Promise<T> {
        debug(LOG_TAG, 'Starting transaction:', action);
        return operation(new MemoryPersistenceTransaction()).toPromise();
      }
    }

    /** Dummy class since memory persistence doesn't actually use transactions. */
    class MemoryPersistenceTransaction implements PersistenceTransaction {}