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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.common.datastructure;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
/**
* Thread Safe List with a cap for Max elements.<br>
* If an element would be inserted to the list and it is full, the oldest
* element will be taken out.
*
* @author mshitrit
*
* @param <T>
*/
public class CapList<T> implements List<T> {
private static final int DEFAULT_CAP = 1000;
private int cap;
private ReadWriteLock readWriteLock;
private List<T> innerList;
public CapList() {
this(DEFAULT_CAP);
}
public CapList(int cap) {
if (cap < 1) {
throw new RuntimeException("List Cap Must Be Positive");
}
this.cap = cap;
innerList = new ArrayList<>();
readWriteLock = new ReentrantReadWriteLock();
}
@Override
public boolean add(T e) {
try {
readWriteLock.writeLock().lock();
boolean result = innerList.add(e);
removeExtras();
return result;
} finally {
readWriteLock.writeLock().unlock();
}
}
private void removeExtras() {
while (innerList.size() > cap) {
innerList.remove(0);
}
}
@Override
public void add(int index, T element) {
try {
readWriteLock.writeLock().lock();
innerList.add(index, element);
} finally {
readWriteLock.writeLock().unlock();
}
}
@Override
public boolean addAll(Collection<? extends T> c) {
try {
readWriteLock.writeLock().lock();
boolean result = innerList.addAll(c);
removeExtras();
return result;
} finally {
readWriteLock.writeLock().unlock();
}
}
@Override
public boolean addAll(int index, Collection<? extends T> c) {
try {
readWriteLock.writeLock().lock();
boolean result = innerList.addAll(index, c);
removeExtras();
return result;
} finally {
readWriteLock.writeLock().unlock();
}
}
@Override
public void clear() {
try {
readWriteLock.writeLock().lock();
innerList.clear();
} finally {
readWriteLock.writeLock().unlock();
}
}
@Override
public boolean contains(Object o) {
try {
readWriteLock.readLock().lock();
return innerList.contains(o);
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public boolean containsAll(Collection<?> c) {
try {
readWriteLock.readLock().lock();
return innerList.containsAll(c);
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public T get(int index) {
try {
readWriteLock.readLock().lock();
return innerList.get(index);
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public int indexOf(Object o) {
try {
readWriteLock.readLock().lock();
return innerList.indexOf(o);
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public boolean isEmpty() {
try {
readWriteLock.readLock().lock();
return innerList.isEmpty();
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public Iterator<T> iterator() {
try {
readWriteLock.readLock().lock();
return innerList.iterator();
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public int lastIndexOf(Object o) {
try {
readWriteLock.readLock().lock();
return innerList.lastIndexOf(o);
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public ListIterator<T> listIterator() {
try {
readWriteLock.readLock().lock();
return innerList.listIterator();
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public ListIterator<T> listIterator(int index) {
try {
readWriteLock.readLock().lock();
return innerList.listIterator(index);
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public boolean remove(Object o) {
try {
readWriteLock.writeLock().lock();
return innerList.remove(o);
} finally {
readWriteLock.writeLock().unlock();
}
}
@Override
public T remove(int index) {
try {
readWriteLock.writeLock().lock();
return innerList.remove(index);
} finally {
readWriteLock.writeLock().unlock();
}
}
@Override
public boolean removeAll(Collection<?> c) {
try {
readWriteLock.writeLock().lock();
return innerList.removeAll(c);
} finally {
readWriteLock.writeLock().unlock();
}
}
@Override
public boolean retainAll(Collection<?> c) {
try {
readWriteLock.writeLock().lock();
return innerList.retainAll(c);
} finally {
readWriteLock.writeLock().unlock();
}
}
@Override
public T set(int index, T element) {
try {
readWriteLock.writeLock().lock();
return innerList.set(index, element);
} finally {
readWriteLock.writeLock().unlock();
}
}
@Override
public int size() {
try {
readWriteLock.readLock().lock();
return innerList.size();
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public List<T> subList(int fromIndex, int toIndex) {
try {
readWriteLock.readLock().lock();
return innerList.subList(fromIndex, toIndex);
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public Object[] toArray() {
try {
readWriteLock.readLock().lock();
return innerList.toArray();
} finally {
readWriteLock.readLock().unlock();
}
}
@Override
public <T> T[] toArray(T[] a) {
try {
readWriteLock.readLock().lock();
return innerList.toArray(a);
} finally {
readWriteLock.readLock().unlock();
}
}
}
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