text: /*
   * Copyright 2017 Google
   *
   * 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 <Foundation/Foundation.h>
  
  @protocol FStorageEngine;
  @protocol FClock;
  @protocol FCachePolicy;
  @class FQuerySpec;
  @class FPath;
  @class FTrackedQuery;
  @class FPruneForest;
  
  @interface FTrackedQueryManager : NSObject
  
  - (id)initWithStorageEngine:(id<FStorageEngine>)storageEngine
                        clock:(id<FClock>)clock;
  
  - (FTrackedQuery *)findTrackedQuery:(FQuerySpec *)query;
  
  - (BOOL)isQueryComplete:(FQuerySpec *)query;
  
  - (void)removeTrackedQuery:(FQuerySpec *)query;
  - (void)setQueryComplete:(FQuerySpec *)query;
  - (void)setQueriesCompleteAtPath:(FPath *)path;
  - (void)setQueryActive:(FQuerySpec *)query;
  - (void)setQueryInactive:(FQuerySpec *)query;
  
  - (BOOL)hasActiveDefaultQueryAtPath:(FPath *)path;
  - (void)ensureCompleteTrackedQueryAtPath:(FPath *)path;
  
  - (FPruneForest *)pruneOldQueries:(id<FCachePolicy>)cachePolicy;
  - (NSUInteger)numberOfPrunableQueries;
  - (NSSet *)knownCompleteChildrenAtPath:(FPath *)path;
  
  // For testing
  - (void)verifyCache;
  
  @end
  