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RedissonBaseMapIterator.java
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RedissonBaseMapIterator.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.AbstractMap;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import org.redisson.client.protocol.decoder.MapScanResult;
import org.redisson.client.protocol.decoder.ScanObjectEntry;
import io.netty.buffer.ByteBuf;
abstract class RedissonBaseMapIterator<K, V, M> implements Iterator<M> {
private Map<ByteBuf, ByteBuf> firstValues;
private Iterator<Map.Entry<ScanObjectEntry, ScanObjectEntry>> iter;
protected long iterPos = 0;
protected InetSocketAddress client;
private boolean finished;
private boolean removeExecuted;
protected Map.Entry<ScanObjectEntry, ScanObjectEntry> entry;
@Override
public boolean hasNext() {
if (finished) {
return false;
}
if (iter == null || !iter.hasNext()) {
MapScanResult<ScanObjectEntry, ScanObjectEntry> res = iterator();
client = res.getRedisClient();
if (iterPos == 0 && firstValues == null) {
firstValues = convert(res.getMap());
} else {
Map<ByteBuf, ByteBuf> newValues = convert(res.getMap());
if (newValues.equals(firstValues)) {
finished = true;
free(firstValues);
free(newValues);
firstValues = null;
return false;
}
free(newValues);
}
iter = res.getMap().entrySet().iterator();
iterPos = res.getPos();
}
return iter.hasNext();
}
protected abstract MapScanResult<ScanObjectEntry, ScanObjectEntry> iterator();
private void free(Map<ByteBuf, ByteBuf> map) {
for (Entry<ByteBuf, ByteBuf> entry : map.entrySet()) {
entry.getKey().release();
entry.getValue().release();
}
}
private Map<ByteBuf, ByteBuf> convert(Map<ScanObjectEntry, ScanObjectEntry> map) {
Map<ByteBuf, ByteBuf> result = new HashMap<ByteBuf, ByteBuf>(map.size());
for (Entry<ScanObjectEntry, ScanObjectEntry> entry : map.entrySet()) {
result.put(entry.getKey().getBuf(), entry.getValue().getBuf());
}
return result;
}
@Override
public M next() {
if (!hasNext()) {
throw new NoSuchElementException("No such element at index");
}
entry = iter.next();
removeExecuted = false;
return getValue(entry);
}
@SuppressWarnings("unchecked")
M getValue(final Entry<ScanObjectEntry, ScanObjectEntry> entry) {
return (M)new AbstractMap.SimpleEntry<K, V>((K)entry.getKey().getObj(), (V)entry.getValue().getObj()) {
@Override
public V setValue(V value) {
return put(entry, value);
}
};
}
@Override
public void remove() {
if (removeExecuted) {
throw new IllegalStateException("Element been already deleted");
}
// lazy init iterator
hasNext();
iter.remove();
removeKey();
removeExecuted = true;
}
protected abstract void removeKey();
protected abstract V put(Entry<ScanObjectEntry, ScanObjectEntry> entry, V value);
}