From bde743ed25166a0b320ae157bfb1d68064f531c9 Mon Sep 17 00:00:00 2001
From: Gil <mcg@google.com>
Date: Tue, 3 Oct 2017 08:55:22 -0700
Subject: Release 4.3.0 (#327)

Initial release of Firestore at 0.8.0
Bump FirebaseCommunity to 0.1.3
---
 Firestore/Source/Local/FSTQueryCache.h | 113 +++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 Firestore/Source/Local/FSTQueryCache.h

(limited to 'Firestore/Source/Local/FSTQueryCache.h')

diff --git a/Firestore/Source/Local/FSTQueryCache.h b/Firestore/Source/Local/FSTQueryCache.h
new file mode 100644
index 0000000..87ee342
--- /dev/null
+++ b/Firestore/Source/Local/FSTQueryCache.h
@@ -0,0 +1,113 @@
+/*
+ * 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>
+
+#import "FSTDocumentKeySet.h"
+#import "FSTGarbageCollector.h"
+#import "FSTTypes.h"
+
+@class FSTDocumentKey;
+@class FSTDocumentSet;
+@class FSTMaybeDocument;
+@class FSTQuery;
+@class FSTQueryData;
+@class FSTWriteGroup;
+@class FSTSnapshotVersion;
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * Represents cached queries received from the remote backend. This contains both a mapping between
+ * queries and the documents that matched them according to the server, but also metadata about the
+ * queries.
+ *
+ * The cache is keyed by FSTQuery and entries in the cache are FSTQueryData instances.
+ */
+@protocol FSTQueryCache <NSObject, FSTGarbageSource>
+
+/** Starts the query cache up. */
+- (void)start;
+
+/** Shuts this cache down, closing open files, etc. */
+- (void)shutdown;
+
+/**
+ * Returns the highest target ID of any query in the cache. Typically called during startup to
+ * seed a target ID generator and avoid collisions with existing queries. If there are no queries
+ * in the cache, returns zero.
+ */
+- (FSTTargetID)highestTargetID;
+
+/**
+ * A global snapshot version representing the last consistent snapshot we received from the
+ * backend. This is monotonically increasing and any snapshots received from the backend prior to
+ * this version (e.g. for targets resumed with a resume_token) should be suppressed (buffered)
+ * until the backend has caught up to this snapshot version again. This prevents our cache from
+ * ever going backwards in time.
+ *
+ * This is updated whenever our we get a TargetChange with a read_time and empty target_ids.
+ */
+- (FSTSnapshotVersion *)lastRemoteSnapshotVersion;
+
+/**
+ * Set the snapshot version representing the last consistent snapshot received from the backend.
+ * (see -lastRemoteSnapshotVersion for more details).
+ *
+ * @param snapshotVersion The new snapshot version.
+ */
+- (void)setLastRemoteSnapshotVersion:(FSTSnapshotVersion *)snapshotVersion
+                               group:(FSTWriteGroup *)group;
+
+/**
+ * Adds or replaces an entry in the cache.
+ *
+ * The cache key is extracted from `queryData.query`. If there is already a cache entry for the
+ * key, it will be replaced.
+ *
+ * @param queryData An FSTQueryData instance to put in the cache.
+ */
+- (void)addQueryData:(FSTQueryData *)queryData group:(FSTWriteGroup *)group;
+
+/** Removes the cached entry for the given query data (no-op if no entry exists). */
+- (void)removeQueryData:(FSTQueryData *)queryData group:(FSTWriteGroup *)group;
+
+/**
+ * Looks up an FSTQueryData entry in the cache.
+ *
+ * @param query The query corresponding to the entry to look up.
+ * @return The cached FSTQueryData entry, or nil if the cache has no entry for the query.
+ */
+- (nullable FSTQueryData *)queryDataForQuery:(FSTQuery *)query;
+
+/** Adds the given document keys to cached query results of the given target ID. */
+- (void)addMatchingKeys:(FSTDocumentKeySet *)keys
+            forTargetID:(FSTTargetID)targetID
+                  group:(FSTWriteGroup *)group;
+
+/** Removes the given document keys from the cached query results of the given target ID. */
+- (void)removeMatchingKeys:(FSTDocumentKeySet *)keys
+               forTargetID:(FSTTargetID)targetID
+                     group:(FSTWriteGroup *)group;
+
+/** Removes all the keys in the query results of the given target ID. */
+- (void)removeMatchingKeysForTargetID:(FSTTargetID)targetID group:(FSTWriteGroup *)group;
+
+- (FSTDocumentKeySet *)matchingKeysForTargetID:(FSTTargetID)targetID;
+
+@end
+
+NS_ASSUME_NONNULL_END
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