Java tutorial
/* * Copyright 2015-2016 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.consistent.impl; import java.util.Collection; import java.util.Map; import java.util.Objects; import java.util.Set; import java.util.concurrent.CompletableFuture; import java.util.stream.Collectors; import org.onlab.util.Tools; import org.onosproject.store.service.AsyncConsistentMap; import org.onosproject.store.service.AsyncDistributedSet; import org.onosproject.store.service.MapEvent; import org.onosproject.store.service.MapEventListener; import org.onosproject.store.service.SetEvent; import org.onosproject.store.service.SetEventListener; import com.google.common.collect.ImmutableSet; import com.google.common.collect.Maps; import com.google.common.collect.Sets; /** * Implementation of {@link AsyncDistributedSet}. * * @param <E> set entry type */ public class DefaultAsyncDistributedSet<E> implements AsyncDistributedSet<E> { private static final String CONTAINS = "contains"; private static final String PRIMITIVE_NAME = "distributedSet"; private static final String SIZE = "size"; private static final String IS_EMPTY = "isEmpty"; private static final String ADD = "add"; private static final String REMOVE = "remove"; private static final String CONTAINS_ALL = "containsAll"; private static final String ADD_ALL = "addAll"; private static final String RETAIN_ALL = "retainAll"; private static final String REMOVE_ALL = "removeAll"; private static final String CLEAR = "clear"; private static final String GET_AS_IMMUTABLE_SET = "getAsImmutableSet"; private final String name; private final AsyncConsistentMap<E, Boolean> backingMap; private final Map<SetEventListener<E>, MapEventListener<E, Boolean>> listenerMapping = Maps .newIdentityHashMap(); private final MeteringAgent monitor; public DefaultAsyncDistributedSet(AsyncConsistentMap<E, Boolean> backingMap, String name, boolean meteringEnabled) { this.backingMap = backingMap; this.name = name; monitor = new MeteringAgent(PRIMITIVE_NAME, name, meteringEnabled); } @Override public String name() { return name; } @Override public CompletableFuture<Integer> size() { final MeteringAgent.Context timer = monitor.startTimer(SIZE); return backingMap.size().whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Boolean> isEmpty() { final MeteringAgent.Context timer = monitor.startTimer(IS_EMPTY); return backingMap.isEmpty().whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Boolean> contains(E element) { final MeteringAgent.Context timer = monitor.startTimer(CONTAINS); return backingMap.containsKey(element).whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Boolean> add(E entry) { final MeteringAgent.Context timer = monitor.startTimer(ADD); return backingMap.putIfAbsent(entry, true).thenApply(Objects::isNull) .whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Boolean> remove(E entry) { final MeteringAgent.Context timer = monitor.startTimer(REMOVE); return backingMap.remove(entry, true).whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Boolean> containsAll(Collection<? extends E> c) { final MeteringAgent.Context timer = monitor.startTimer(CONTAINS_ALL); return Tools.allOf(c.stream().map(this::contains).collect(Collectors.toList())) .thenApply(v -> v.stream().reduce(Boolean::logicalAnd).orElse(true)) .whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Boolean> addAll(Collection<? extends E> c) { final MeteringAgent.Context timer = monitor.startTimer(ADD_ALL); return Tools.allOf(c.stream().map(this::add).collect(Collectors.toList())) .thenApply(v -> v.stream().reduce(Boolean::logicalOr).orElse(false)) .whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Boolean> retainAll(Collection<? extends E> c) { final MeteringAgent.Context timer = monitor.startTimer(RETAIN_ALL); return backingMap.keySet().thenApply(set -> Sets.difference(set, Sets.newHashSet(c))) .thenCompose(this::removeAll).whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Boolean> removeAll(Collection<? extends E> c) { final MeteringAgent.Context timer = monitor.startTimer(REMOVE_ALL); return Tools.allOf(c.stream().map(this::remove).collect(Collectors.toList())) .thenApply(v -> v.stream().reduce(Boolean::logicalOr).orElse(false)) .whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Void> clear() { final MeteringAgent.Context timer = monitor.startTimer(CLEAR); return backingMap.clear().whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<? extends Set<E>> getAsImmutableSet() { final MeteringAgent.Context timer = monitor.startTimer(GET_AS_IMMUTABLE_SET); return backingMap.keySet().thenApply(s -> ImmutableSet.copyOf(s)).whenComplete((r, e) -> timer.stop(null)); } @Override public CompletableFuture<Void> addListener(SetEventListener<E> listener) { MapEventListener<E, Boolean> mapEventListener = mapEvent -> { if (mapEvent.type() == MapEvent.Type.INSERT) { listener.event(new SetEvent<>(name, SetEvent.Type.ADD, mapEvent.key())); } else if (mapEvent.type() == MapEvent.Type.REMOVE) { listener.event(new SetEvent<>(name, SetEvent.Type.REMOVE, mapEvent.key())); } }; if (listenerMapping.putIfAbsent(listener, mapEventListener) == null) { return backingMap.addListener(mapEventListener); } return CompletableFuture.completedFuture(null); } @Override public CompletableFuture<Void> removeListener(SetEventListener<E> listener) { MapEventListener<E, Boolean> mapEventListener = listenerMapping.remove(listener); if (mapEventListener != null) { return backingMap.removeListener(mapEventListener); } return CompletableFuture.completedFuture(null); } }