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8cf2be030f
* Add an DD tenant-cache-assembly actor * Add basic tenant list monitoring for tenant cache. * Update DD tenant cache refresh to be more efficient and unit-testable * Remove the DD prefix in the tenant cache class name (and associated impl and UT class names); there is nothing specific to DD in it; DD uses it; other modules may use it in the future * Disable DD tenant awareness by default
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/*
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* TenantCache.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "fdbclient/FDBTypes.h"
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#include "fdbclient/Tenant.h"
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#include "fdbserver/DDTeamCollection.h"
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#include "fdbserver/TCInfo.h"
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#include "flow/IRandom.h"
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#include "flow/IndexedSet.h"
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#include <limits>
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#include <string>
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typedef Map<KeyRef, Reference<TCTenantInfo>> TenantMapByPrefix;
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class TenantCache : public ReferenceCounted<TenantCache> {
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friend class TenantCacheImpl;
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friend class TenantCacheUnitTest;
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private:
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constexpr static uint64_t INVALID_GENERATION = std::numeric_limits<uint64_t>::max();
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UID distributorID;
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Database cx;
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uint64_t generation;
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TenantMapByPrefix tenantCache;
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// mark the start of a new sweep of the tenant cache
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void startRefresh();
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void insert(TenantName& tenantName, TenantMapEntry& tenant);
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void keep(TenantName& tenantName, TenantMapEntry& tenant);
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// return true if a new tenant is inserted into the cache
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bool update(TenantName& tenantName, TenantMapEntry& tenant);
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// return count of tenants that were found to be stale and removed from the cache
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int cleanup();
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UID id() const { return distributorID; }
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Database dbcx() const { return cx; }
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public:
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TenantCache(Database cx, UID distributorID) : distributorID(distributorID), cx(cx) {
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generation = deterministicRandom()->randomUInt32();
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}
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Future<Void> build(Database cx);
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Future<Void> monitorTenantMap();
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std::string desc() const;
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bool isTenantKey(KeyRef key) const;
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};
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