/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.kafka.streams.state.internals;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.errors.InvalidStateStoreException;
import org.apache.kafka.streams.processor.ProcessorContext;
import org.apache.kafka.streams.processor.StateStore;
import org.apache.kafka.streams.state.ReadOnlyWindowStore;
import org.apache.kafka.streams.state.WindowStoreIterator;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
* A very simple window store stub for testing purposes.
*/
public class ReadOnlyWindowStoreStub<K, V> implements ReadOnlyWindowStore<K, V>, StateStore {
private final Map<Long, Map<K, V>> data = new HashMap<>();
private boolean open = true;
@Override
public WindowStoreIterator<V> fetch(final K key, final long timeFrom, final long timeTo) {
if (!open) {
throw new InvalidStateStoreException("Store is not open");
}
final List<KeyValue<Long, V>> results = new ArrayList<>();
for (long now = timeFrom; now <= timeTo; now++) {
final Map<K, V> kvMap = data.get(now);
if (kvMap != null && kvMap.containsKey(key)) {
results.add(new KeyValue<>(now, kvMap.get(key)));
}
}
return new TheWindowStoreIterator<>(results.iterator());
}
public void put(final K key, final V value, final long timestamp) {
if (!data.containsKey(timestamp)) {
data.put(timestamp, new HashMap<K, V>());
}
data.get(timestamp).put(key, value);
}
@Override
public String name() {
return null;
}
@Override
public void init(final ProcessorContext context, final StateStore root) {
}
@Override
public void flush() {
}
@Override
public void close() {
}
@Override
public boolean persistent() {
return false;
}
@Override
public boolean isOpen() {
return open;
}
public void setOpen(final boolean open) {
this.open = open;
}
private class TheWindowStoreIterator<E> implements WindowStoreIterator<E> {
private final Iterator<KeyValue<Long, E>> underlying;
TheWindowStoreIterator(final Iterator<KeyValue<Long, E>> underlying) {
this.underlying = underlying;
}
@Override
public void close() {
}
@Override
public Long peekNextKey() {
throw new UnsupportedOperationException("peekNextKey() not supported in " + getClass().getName());
}
@Override
public boolean hasNext() {
return underlying.hasNext();
}
@Override
public KeyValue<Long, E> next() {
return underlying.next();
}
@Override
public void remove() {
}
}
}