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/*
* Copyright 2017-2018 the original author or authors.
*
* 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.springframework.data.redis.connection.lettuce;
import io.lettuce.core.KeyScanCursor;
import io.lettuce.core.ScanArgs;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ThreadLocalRandom;
import org.springframework.data.redis.connection.ClusterSlotHashUtil;
import org.springframework.data.redis.connection.RedisClusterNode;
import org.springframework.data.redis.connection.SortParameters;
import org.springframework.data.redis.connection.lettuce.LettuceClusterConnection.LettuceClusterCommandCallback;
import org.springframework.data.redis.core.Cursor;
import org.springframework.data.redis.core.ScanCursor;
import org.springframework.data.redis.core.ScanOptions;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
/**
* @author Christoph Strobl
* @author Mark Paluch
* @since 2.0
*/
class LettuceClusterKeyCommands extends LettuceKeyCommands {
private final LettuceClusterConnection connection;
LettuceClusterKeyCommands(LettuceClusterConnection connection) {
super(connection);
this.connection = connection;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.lettuce.LettuceConnection#randomKey()
*/
@Override
public byte[] randomKey() {
List nodes = connection.clusterGetNodes();
Set inspectedNodes = new HashSet<>(nodes.size());
do {
RedisClusterNode node = nodes.get(ThreadLocalRandom.current().nextInt(nodes.size()));
while (inspectedNodes.contains(node)) {
node = nodes.get(ThreadLocalRandom.current().nextInt(nodes.size()));
}
inspectedNodes.add(node);
byte[] key = randomKey(node);
if (key != null && key.length > 0) {
return key;
}
} while (nodes.size() != inspectedNodes.size());
return null;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.lettuce.LettuceConnection#keys(byte[])
*/
@Override
public Set keys(byte[] pattern) {
Assert.notNull(pattern, "Pattern must not be null!");
Collection> keysPerNode = connection.getClusterCommandExecutor()
.executeCommandOnAllNodes((LettuceClusterCommandCallback>) connection -> connection.keys(pattern))
.resultsAsList();
Set keys = new HashSet<>();
for (List keySet : keysPerNode) {
keys.addAll(keySet);
}
return keys;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.lettuce.LettuceConnection#rename(byte[], byte[])
*/
@Override
public void rename(byte[] sourceKey, byte[] targetKey) {
Assert.notNull(sourceKey, "Source key must not be null!");
Assert.notNull(targetKey, "Target key must not be null!");
if (ClusterSlotHashUtil.isSameSlotForAllKeys(sourceKey, targetKey)) {
super.rename(sourceKey, targetKey);
return;
}
byte[] value = dump(sourceKey);
if (value != null && value.length > 0) {
restore(targetKey, 0, value);
del(sourceKey);
}
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.lettuce.LettuceConnection#renameNX(byte[], byte[])
*/
@Override
public Boolean renameNX(byte[] sourceKey, byte[] targetKey) {
Assert.notNull(sourceKey, "Source key must not be null!");
Assert.notNull(targetKey, "Target key must not be null!");
if (ClusterSlotHashUtil.isSameSlotForAllKeys(sourceKey, targetKey)) {
return super.renameNX(sourceKey, targetKey);
}
byte[] value = dump(sourceKey);
if (value != null && value.length > 0 && !exists(targetKey)) {
restore(targetKey, 0, value);
del(sourceKey);
return Boolean.TRUE;
}
return Boolean.FALSE;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.lettuce.LettuceConnection#move(byte[], int)
*/
@Override
public Boolean move(byte[] key, int dbIndex) {
throw new UnsupportedOperationException("MOVE not supported in CLUSTER mode!");
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisClusterConnection#randomKey(org.springframework.data.redis.connection.RedisClusterNode)
*/
@Nullable
public byte[] randomKey(RedisClusterNode node) {
return connection.getClusterCommandExecutor()
.executeCommandOnSingleNode((LettuceClusterCommandCallback) client -> client.randomkey(), node)
.getValue();
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisClusterConnection#keys(org.springframework.data.redis.connection.RedisClusterNode, byte[])
*/
@Nullable
public Set keys(RedisClusterNode node, byte[] pattern) {
Assert.notNull(pattern, "Pattern must not be null!");
return LettuceConverters.toBytesSet(connection.getClusterCommandExecutor()
.executeCommandOnSingleNode((LettuceClusterCommandCallback>) client -> client.keys(pattern), node)
.getValue());
}
/**
* Use a {@link Cursor} to iterate over keys stored at the given {@link RedisClusterNode}.
*
* @param node must not be {@literal null}.
* @param options must not be {@literal null}.
* @return never {@literal null}.
* @since 2.1
*/
Cursor scan(RedisClusterNode node, ScanOptions options) {
Assert.notNull(node, "RedisClusterNode must not be null!");
Assert.notNull(options, "Options must not be null!");
return connection.getClusterCommandExecutor()
.executeCommandOnSingleNode((LettuceClusterCommandCallback>) client -> {
return new LettuceScanCursor(options) {
@Override
protected LettuceScanIteration doScan(io.lettuce.core.ScanCursor cursor, ScanOptions options) {
ScanArgs scanArgs = LettuceConverters.toScanArgs(options);
KeyScanCursor keyScanCursor = client.scan(cursor, scanArgs);
return new LettuceScanIteration<>(keyScanCursor, keyScanCursor.getKeys());
}
}.open();
}, node).getValue();
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.lettuce.LettuceConnection#sort(byte[], org.springframework.data.redis.connection.SortParameters, byte[])
*/
@Override
public Long sort(byte[] key, SortParameters params, byte[] storeKey) {
Assert.notNull(key, "Key must not be null!");
if (ClusterSlotHashUtil.isSameSlotForAllKeys(key, storeKey)) {
return super.sort(key, params, storeKey);
}
List sorted = sort(key, params);
if (!CollectionUtils.isEmpty(sorted)) {
byte[][] arr = new byte[sorted.size()][];
switch (type(key)) {
case SET:
connection.setCommands().sAdd(storeKey, sorted.toArray(arr));
return 1L;
case LIST:
connection.listCommands().lPush(storeKey, sorted.toArray(arr));
return 1L;
default:
throw new IllegalArgumentException("sort and store is only supported for SET and LIST");
}
}
return 0L;
}
}
