| // Copyright (C) 2017 The Android Open Source Project |
| // |
| // 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. |
| |
| package com.google.gerrit.server.schema; |
| |
| import static com.google.common.base.Preconditions.checkState; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.util.concurrent.Futures; |
| import com.google.gerrit.reviewdb.server.ReviewDbWrapper; |
| import com.google.gwtorm.client.Key; |
| import com.google.gwtorm.server.Access; |
| import com.google.gwtorm.server.AtomicUpdate; |
| import com.google.gwtorm.server.ListResultSet; |
| import com.google.gwtorm.server.OrmException; |
| import com.google.gwtorm.server.ResultSet; |
| import java.util.Map; |
| import java.util.function.Function; |
| |
| abstract class AbstractDisabledAccess<T, K extends Key<?>> implements Access<T, K> { |
| private static <T> ResultSet<T> empty() { |
| return new ListResultSet<>(ImmutableList.of()); |
| } |
| |
| @SuppressWarnings("deprecation") |
| private static <T> |
| com.google.common.util.concurrent.CheckedFuture<T, OrmException> emptyFuture() { |
| return Futures.immediateCheckedFuture(null); |
| } |
| |
| // Don't even hold a reference to delegate, so it's not possible to use it |
| // accidentally. |
| private final ReviewDbWrapper wrapper; |
| private final String relationName; |
| private final int relationId; |
| private final Function<T, K> primaryKey; |
| private final Function<Iterable<T>, Map<K, T>> toMap; |
| |
| AbstractDisabledAccess(ReviewDbWrapper wrapper, Access<T, K> delegate) { |
| this.wrapper = wrapper; |
| this.relationName = delegate.getRelationName(); |
| this.relationId = delegate.getRelationID(); |
| this.primaryKey = delegate::primaryKey; |
| this.toMap = delegate::toMap; |
| } |
| |
| @Override |
| public final int getRelationID() { |
| return relationId; |
| } |
| |
| @Override |
| public final String getRelationName() { |
| return relationName; |
| } |
| |
| @Override |
| public final K primaryKey(T entity) { |
| return primaryKey.apply(entity); |
| } |
| |
| @Override |
| public final Map<K, T> toMap(Iterable<T> iterable) { |
| return toMap.apply(iterable); |
| } |
| |
| @Override |
| public final ResultSet<T> iterateAllEntities() { |
| return empty(); |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public final com.google.common.util.concurrent.CheckedFuture<T, OrmException> getAsync(K key) { |
| return emptyFuture(); |
| } |
| |
| @Override |
| public final ResultSet<T> get(Iterable<K> keys) { |
| return empty(); |
| } |
| |
| @Override |
| public final void insert(Iterable<T> instances) { |
| // Do nothing. |
| } |
| |
| @Override |
| public final void update(Iterable<T> instances) { |
| // Do nothing. |
| } |
| |
| @Override |
| public final void upsert(Iterable<T> instances) { |
| // Do nothing. |
| } |
| |
| @Override |
| public final void deleteKeys(Iterable<K> keys) { |
| // Do nothing. |
| } |
| |
| @Override |
| public final void delete(Iterable<T> instances) { |
| // Do nothing. |
| } |
| |
| @Override |
| public final void beginTransaction(K key) { |
| // Keep track of when we've started a transaction so that we can avoid calling commit/rollback |
| // on the underlying ReviewDb. This is just a simple arm's-length approach, and may produce |
| // slightly different results from a native ReviewDb in corner cases like: |
| // * beginning transactions on different tables simultaneously |
| // * doing work between commit and rollback |
| // These kinds of things are already misuses of ReviewDb, and shouldn't be happening in current |
| // code anyway. |
| checkState(!wrapper.inTransaction(), "already in transaction"); |
| wrapper.beginTransaction(); |
| } |
| |
| @Override |
| public final T atomicUpdate(K key, AtomicUpdate<T> update) { |
| return null; |
| } |
| |
| @Override |
| public final T get(K id) { |
| return null; |
| } |
| } |