Java tutorial
/* * Copyright 2016-present Open Networking Laboratory * * 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 org.onosproject.store.service; import java.util.List; import java.util.function.Function; import org.onosproject.store.primitives.MapUpdate; import org.onosproject.store.primitives.TransactionId; import com.google.common.base.MoreObjects; import com.google.common.collect.ImmutableList; import com.google.common.collect.Lists; /** * Collection of map updates to be committed atomically. * * @param <K> key type * @param <V> value type */ public class MapTransaction<K, V> { private final TransactionId transactionId; private final List<MapUpdate<K, V>> updates; public MapTransaction(TransactionId transactionId, List<MapUpdate<K, V>> updates) { this.transactionId = transactionId; this.updates = ImmutableList.copyOf(updates); } /** * Returns the transaction identifier. * * @return transaction id */ public TransactionId transactionId() { return transactionId; } /** * Returns the list of map updates. * * @return map updates */ public List<MapUpdate<K, V>> updates() { return updates; } @Override public String toString() { return MoreObjects.toStringHelper(getClass()).add("transactionId", transactionId).add("updates", updates) .toString(); } /** * Maps this instance to another {@code MapTransaction} with different key and value types. * * @param keyMapper function for mapping key types * @param valueMapper function for mapping value types * @return newly typed instance * * @param <S> key type of returned instance * @param <T> value type of returned instance */ public <S, T> MapTransaction<S, T> map(Function<K, S> keyMapper, Function<V, T> valueMapper) { return new MapTransaction<>(transactionId, Lists.transform(updates, u -> u.map(keyMapper, valueMapper))); } }