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RedissonMapReactiveIterator.java
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RedissonMapReactiveIterator.java
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/**
* Copyright 2014 Nikita Koksharov, Nickolay Borbit
*
* 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.redisson;
import java.net.InetSocketAddress;
import java.util.Map;
import java.util.Map.Entry;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import org.redisson.client.protocol.decoder.MapScanResult;
import reactor.rx.Stream;
import reactor.rx.subscription.ReactiveSubscription;
public class RedissonMapReactiveIterator<K, V, M> {
private final RedissonMapReactive<K, V> map;
public RedissonMapReactiveIterator(RedissonMapReactive<K, V> map) {
this.map = map;
}
public Publisher<M> stream() {
return new Stream<M>() {
@Override
public void subscribe(final Subscriber<? super M> t) {
t.onSubscribe(new ReactiveSubscription<M>(this, t) {
private Map<K, V> firstValues;
private long iterPos = 0;
private InetSocketAddress client;
private long currentIndex;
@Override
protected void onRequest(final long n) {
currentIndex = n;
nextValues();
}
protected void nextValues() {
final ReactiveSubscription<M> m = this;
map.scanIteratorReactive(client, iterPos).subscribe(new Subscriber<MapScanResult<Object, V>>() {
@Override
public void onSubscribe(Subscription s) {
s.request(Long.MAX_VALUE);
}
@Override
public void onNext(MapScanResult<Object, V> res) {
client = res.getRedisClient();
if (iterPos == 0 && firstValues == null) {
firstValues = (Map<K, V>) res.getMap();
} else if (res.getMap().equals(firstValues)) {
m.onComplete();
currentIndex = 0;
return;
}
iterPos = res.getPos();
for (Entry<K, V> entry : ((Map<K, V>)res.getMap()).entrySet()) {
M val = getValue(entry);
m.onNext(val);
currentIndex--;
if (currentIndex == 0) {
m.onComplete();
return;
}
}
}
@Override
public void onError(Throwable error) {
m.onError(error);
}
@Override
public void onComplete() {
if (currentIndex == 0) {
return;
}
nextValues();
}
});
}
});
}
};
}
M getValue(Entry<K, V> entry) {
return (M) entry;
}
}