package redis.clients.jedis;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.apache.commons.pool2.impl.GenericObjectPoolConfig;
import redis.clients.util.ClusterNodeInformation;
import redis.clients.util.ClusterNodeInformationParser;
import redis.clients.util.SafeEncoder;
public class JedisClusterInfoCache {
public static final ClusterNodeInformationParser nodeInfoParser = new ClusterNodeInformationParser();
private Map<String, JedisPool> nodes = new HashMap<String, JedisPool>();
private Map<Integer, JedisPool> slots = new HashMap<Integer, JedisPool>();
private final ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
private final Lock r = rwl.readLock();
private final Lock w = rwl.writeLock();
private final GenericObjectPoolConfig poolConfig;
public JedisClusterInfoCache(final GenericObjectPoolConfig poolConfig) {
this.poolConfig = poolConfig;
}
public void discoverClusterNodesAndSlots(Jedis jedis) {
w.lock();
try {
this.nodes.clear();
this.slots.clear();
String localNodes = jedis.clusterNodes();
for (String nodeInfo : localNodes.split("\n")) {
ClusterNodeInformation clusterNodeInfo = nodeInfoParser.parse(
nodeInfo, new HostAndPort(jedis.getClient().getHost(),
jedis.getClient().getPort()));
HostAndPort targetNode = clusterNodeInfo.getNode();
setNodeIfNotExist(targetNode);
assignSlotsToNode(clusterNodeInfo.getAvailableSlots(),
targetNode);
}
} finally {
w.unlock();
}
}
public void discoverClusterSlots(Jedis jedis) {
w.lock();
try {
this.slots.clear();
List<Object> slots = jedis.clusterSlots();
for (Object slotInfoObj : slots) {
List<Object> slotInfo = (List<Object>) slotInfoObj;
if (slotInfo.size() <= 2) {
continue;
}
List<Integer> slotNums = getAssignedSlotArray(slotInfo);
// hostInfos
List<Object> hostInfos = (List<Object>) slotInfo.get(2);
if (hostInfos.size() <= 0) {
continue;
}
// at this time, we just use master, discard slave information
HostAndPort targetNode = generateHostAndPort(hostInfos);
setNodeIfNotExist(targetNode);
assignSlotsToNode(slotNums, targetNode);
}
} finally {
w.unlock();
}
}
private HostAndPort generateHostAndPort(List<Object> hostInfos) {
return new HostAndPort(SafeEncoder.encode((byte[]) hostInfos.get(0)),
((Long) hostInfos.get(1)).intValue());
}
public void setNodeIfNotExist(HostAndPort node) {
w.lock();
try {
String nodeKey = getNodeKey(node);
if (nodes.containsKey(nodeKey))
return;
JedisPool nodePool = new JedisPool(poolConfig, node.getHost(),
node.getPort());
nodes.put(nodeKey, nodePool);
} finally {
w.unlock();
}
}
public void assignSlotToNode(int slot, HostAndPort targetNode) {
w.lock();
try {
JedisPool targetPool = nodes.get(getNodeKey(targetNode));
if (targetPool == null) {
setNodeIfNotExist(targetNode);
targetPool = nodes.get(getNodeKey(targetNode));
}
slots.put(slot, targetPool);
} finally {
w.unlock();
}
}
public void assignSlotsToNode(List<Integer> targetSlots,
HostAndPort targetNode) {
w.lock();
try {
JedisPool targetPool = nodes.get(getNodeKey(targetNode));
if (targetPool == null) {
setNodeIfNotExist(targetNode);
targetPool = nodes.get(getNodeKey(targetNode));
}
for (Integer slot : targetSlots) {
slots.put(slot, targetPool);
}
} finally {
w.unlock();
}
}
public JedisPool getNode(String nodeKey) {
r.lock();
try {
return nodes.get(nodeKey);
} finally {
r.unlock();
}
}
public JedisPool getSlotPool(int slot) {
r.lock();
try {
return slots.get(slot);
} finally {
r.unlock();
}
}
public Map<String, JedisPool> getNodes() {
r.lock();
try {
return new HashMap<String, JedisPool>(nodes);
} finally {
r.unlock();
}
}
public static String getNodeKey(HostAndPort hnp) {
return hnp.getHost() + ":" + hnp.getPort();
}
public static String getNodeKey(Client client) {
return client.getHost() + ":" + client.getPort();
}
public static String getNodeKey(Jedis jedis) {
return getNodeKey(jedis.getClient());
}
private List<Integer> getAssignedSlotArray(List<Object> slotInfo) {
List<Integer> slotNums = new ArrayList<Integer>();
for (int slot = ((Long) slotInfo.get(0)).intValue(); slot <= ((Long) slotInfo
.get(1)).intValue(); slot++) {
slotNums.add(slot);
}
return slotNums;
}
}