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/*
* Copyright 2015 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 com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import org.onosproject.store.service.ConsistentMap;
import org.onosproject.store.service.DistributedSet;
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 java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* Implementation of distributed set that is backed by a ConsistentMap.
* @param <E> set element type
*/
public class DefaultDistributedSet<E> implements DistributedSet<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 ITERATOR = "iterator";
private static final String TO_ARRAY = "toArray";
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 final String name;
private final ConsistentMap<E, Boolean> backingMap;
private final Map<SetEventListener<E>, MapEventListener<E, Boolean>> listenerMapping = Maps.newIdentityHashMap();
private final MeteringAgent monitor;
public DefaultDistributedSet(String name, boolean meteringEnabled, ConsistentMap<E, Boolean> backingMap) {
this.name = name;
this.backingMap = backingMap;
monitor = new MeteringAgent(PRIMITIVE_NAME, name, meteringEnabled);
}
@Override
public int size() {
final MeteringAgent.Context timer = monitor.startTimer(SIZE);
try {
return backingMap.size();
} finally {
timer.stop(null);
}
}
@Override
public boolean isEmpty() {
final MeteringAgent.Context timer = monitor.startTimer(IS_EMPTY);
try {
return backingMap.isEmpty();
} finally {
timer.stop(null);
}
}
@SuppressWarnings("unchecked")
@Override
public boolean contains(Object o) {
final MeteringAgent.Context timer = monitor.startTimer(CONTAINS);
try {
return backingMap.containsKey((E) o);
} finally {
timer.stop(null);
}
}
@Override
public Iterator<E> iterator() {
final MeteringAgent.Context timer = monitor.startTimer(ITERATOR);
//Do we have to measure this guy?
try {
return backingMap.keySet().iterator();
} finally {
timer.stop(null);
}
}
@Override
public Object[] toArray() {
final MeteringAgent.Context timer = monitor.startTimer(TO_ARRAY);
try {
return backingMap.keySet().stream().toArray();
} finally {
timer.stop(null);
}
}
@Override
public <T> T[] toArray(T[] a) {
final MeteringAgent.Context timer = monitor.startTimer(TO_ARRAY);
try {
return backingMap.keySet().stream().toArray(size -> a);
} finally {
timer.stop(null);
}
}
@Override
public boolean add(E e) {
final MeteringAgent.Context timer = monitor.startTimer(ADD);
try {
return backingMap.putIfAbsent(e, true) == null;
} finally {
timer.stop(null);
}
}
@SuppressWarnings("unchecked")
@Override
public boolean remove(Object o) {
final MeteringAgent.Context timer = monitor.startTimer(REMOVE);
try {
return backingMap.remove((E) o) != null;
} finally {
timer.stop(null);
}
}
@Override
public boolean containsAll(Collection<?> c) {
final MeteringAgent.Context timer = monitor.startTimer(CONTAINS_ALL);
try {
return c.stream()
.allMatch(this::contains);
} finally {
timer.stop(null);
}
}
@Override
public boolean addAll(Collection<? extends E> c) {
final MeteringAgent.Context timer = monitor.startTimer(ADD_ALL);
try {
return c.stream()
.map(this::add)
.reduce(Boolean::logicalOr)
.orElse(false);
} finally {
timer.stop(null);
}
}
@Override
public boolean retainAll(Collection<?> c) {
final MeteringAgent.Context timer = monitor.startTimer(RETAIN_ALL);
try {
Set<?> retainSet = Sets.newHashSet(c);
return backingMap.keySet()
.stream()
.filter(k -> !retainSet.contains(k))
.map(this::remove)
.reduce(Boolean::logicalOr)
.orElse(false);
} finally {
timer.stop(null);
}
}
@Override
public boolean removeAll(Collection<?> c) {
final MeteringAgent.Context timer = monitor.startTimer(REMOVE_ALL);
try {
Set<?> removeSet = Sets.newHashSet(c);
return backingMap.keySet()
.stream()
.filter(removeSet::contains)
.map(this::remove)
.reduce(Boolean::logicalOr)
.orElse(false);
} finally {
timer.stop(null);
}
}
@Override
public void clear() {
final MeteringAgent.Context timer = monitor.startTimer(CLEAR);
try {
backingMap.clear();
} finally {
timer.stop(null);
}
}
@Override
public 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) {
backingMap.addListener(mapEventListener);
}
}
@Override
public void removeListener(SetEventListener<E> listener) {
MapEventListener<E, Boolean> mapEventListener = listenerMapping.remove(listener);
if (mapEventListener != null) {
backingMap.removeListener(mapEventListener);
}
}
}
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