80 lines
3.0 KiB
C++
80 lines
3.0 KiB
C++
/*
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* DatabaseContext.cpp
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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/DatabaseContext.h"
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Reference<WatchMetadata> DatabaseContext::getWatchMetadata(int64_t tenantId, KeyRef key) const {
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const auto it = watchMap.find(std::make_pair(tenantId, key));
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if (it == watchMap.end())
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return Reference<WatchMetadata>();
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return it->second;
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}
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void DatabaseContext::setWatchMetadata(Reference<WatchMetadata> metadata) {
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const WatchMapKey key(metadata->parameters->tenant.tenantId, metadata->parameters->key);
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watchMap[key] = metadata;
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// NOTE Here we do *NOT* update/reset the reference count for the key, see the source code in getWatchFuture.
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// Basically the reference count could be increased, or the same watch is refreshed, or the watch might be cancelled
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}
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int32_t DatabaseContext::increaseWatchRefCount(const int64_t tenantID, KeyRef key, const Version& version) {
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const WatchMapKey mapKey(tenantID, key);
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watchCounterMap[mapKey].insert(version);
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return watchCounterMap[mapKey].size();
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}
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int32_t DatabaseContext::decreaseWatchRefCount(const int64_t tenantID, KeyRef key, const Version& version) {
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const WatchMapKey mapKey(tenantID, key);
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auto mapKeyIter = watchCounterMap.find(mapKey);
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if (mapKeyIter == std::end(watchCounterMap)) {
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// Key does not exist. The metadata might be removed by deleteWatchMetadata already.
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return 0;
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}
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auto& versionSet = mapKeyIter->second;
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auto versionIter = versionSet.find(version);
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if (versionIter == std::end(versionSet)) {
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// Version not found, the watch might be cleared before.
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return versionSet.size();
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}
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versionSet.erase(versionIter);
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const auto count = versionSet.size();
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// The metadata might be deleted somewhere else, before calling this decreaseWatchRefCount
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if (auto metadata = getWatchMetadata(tenantID, key); metadata.isValid() && versionSet.size() == 0) {
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// It is a *must* to cancel the watchFutureSS manually. watchFutureSS waits for watchStorageServerResp, which
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// holds a reference to the metadata. If the ACTOR is not cancelled, it indirectly holds a Future waiting for
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// itself.
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metadata->watchFutureSS.cancel();
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deleteWatchMetadata(tenantID, key);
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}
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return count;
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}
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void DatabaseContext::deleteWatchMetadata(int64_t tenantId, KeyRef key, bool removeReferenceCount) {
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const WatchMapKey mapKey(tenantId, key);
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watchMap.erase(mapKey);
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if (removeReferenceCount) {
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watchCounterMap.erase(mapKey);
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}
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}
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