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/*
* Copyright 2015-2020 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
*
* https://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;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
/**
* Representation of a Redis server within the cluster.
*
* @author Christoph Strobl
* @author Mark Paluch
* @since 1.7
*/
public class RedisClusterNode extends RedisNode {
private SlotRange slotRange;
private @Nullable LinkState linkState;
private Set flags;
protected RedisClusterNode() {
super();
flags = Collections.emptySet();
}
/**
* Creates new {@link RedisClusterNode} with empty {@link SlotRange}.
*
* @param host must not be {@literal null}.
* @param port
*/
public RedisClusterNode(String host, int port) {
this(host, port, SlotRange.empty());
}
/**
* Creates new {@link RedisClusterNode} with an id and empty {@link SlotRange}.
*
* @param id must not be {@literal null}.
*/
public RedisClusterNode(String id) {
this(SlotRange.empty());
Assert.notNull(id, "Id must not be null!");
this.id = id;
}
/**
* Creates new {@link RedisClusterNode} with given {@link SlotRange}.
*
* @param host must not be {@literal null}.
* @param port
* @param slotRange must not be {@literal null}.
*/
public RedisClusterNode(String host, int port, SlotRange slotRange) {
super(host, port);
Assert.notNull(slotRange, "SlotRange must not be null!");
this.slotRange = slotRange;
}
/**
* Creates new {@link RedisClusterNode} with given {@link SlotRange}.
*
* @param slotRange must not be {@literal null}.
*/
public RedisClusterNode(SlotRange slotRange) {
super();
Assert.notNull(slotRange, "SlotRange must not be null!");
this.slotRange = slotRange;
}
{
if (flags == null) {
flags = Collections.emptySet();
}
}
/**
* Get the served {@link SlotRange}.
*
* @return never {@literal null}.
*/
public SlotRange getSlotRange() {
return slotRange;
}
/**
* @param slot
* @return true if slot is covered.
*/
public boolean servesSlot(int slot) {
return slotRange.contains(slot);
}
/**
* @return can be {@literal null}
*/
@Nullable
public LinkState getLinkState() {
return linkState;
}
/**
* @return true if node is connected to cluster.
*/
public boolean isConnected() {
return LinkState.CONNECTED.equals(linkState);
}
/**
* @return never {@literal null}.
*/
public Set getFlags() {
return flags == null ? Collections.emptySet() : flags;
}
/**
* @return true if node is marked as failing.
*/
public boolean isMarkedAsFail() {
if (!CollectionUtils.isEmpty(flags)) {
return flags.contains(Flag.FAIL) || flags.contains(Flag.PFAIL);
}
return false;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisNode#toString()
*/
@Override
public String toString() {
return super.toString();
}
/**
* Get {@link RedisClusterNodeBuilder} for creating new {@link RedisClusterNode}.
*
* @return never {@literal null}.
*/
public static RedisClusterNodeBuilder newRedisClusterNode() {
return new RedisClusterNodeBuilder();
}
/**
* @author Christoph Strobl
* @since 1.7
*/
public static class SlotRange {
private final Set range;
/**
* @param lowerBound must not be {@literal null}.
* @param upperBound must not be {@literal null}.
*/
public SlotRange(Integer lowerBound, Integer upperBound) {
Assert.notNull(lowerBound, "LowerBound must not be null!");
Assert.notNull(upperBound, "UpperBound must not be null!");
this.range = new LinkedHashSet<>();
for (int i = lowerBound; i <= upperBound; i++) {
this.range.add(i);
}
}
public SlotRange(Collection range) {
this.range = CollectionUtils.isEmpty(range) ? Collections.emptySet() : new LinkedHashSet<>(range);
}
@Override
public String toString() {
return range.toString();
}
/**
* @param slot
* @return true when slot is part of the range.
*/
public boolean contains(int slot) {
return range.contains(slot);
}
/**
* @return
*/
public Set getSlots() {
return Collections.unmodifiableSet(range);
}
public int[] getSlotsArray() {
int[] slots = new int[range.size()];
int pos = 0;
for (Integer value : range) {
slots[pos++] = value.intValue();
}
return slots;
}
public static SlotRange empty() {
return new SlotRange(Collections.emptySet());
}
}
/**
* @author Christoph Strobl
* @since 1.7
*/
public enum LinkState {
CONNECTED, DISCONNECTED
}
/**
* @author Christoph Strobl
* @since 1.7
*/
public static enum Flag {
MYSELF("myself"), MASTER("master"), SLAVE("slave"), FAIL("fail"), PFAIL("fail?"), HANDSHAKE("handshake"), NOADDR(
"noaddr"), NOFLAGS("noflags");
private String raw;
Flag(String raw) {
this.raw = raw;
}
public String getRaw() {
return raw;
}
}
/**
* Builder for creating new {@link RedisClusterNode}.
*
* @author Christoph Strobl
* @since 1.7
*/
public static class RedisClusterNodeBuilder extends RedisNodeBuilder {
@Nullable Set flags;
@Nullable LinkState linkState;
SlotRange slotRange;
public RedisClusterNodeBuilder() {
this.slotRange = SlotRange.empty();
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisNode.RedisNodeBuilder#listeningAt(java.lang.String, int)
*/
@Override
public RedisClusterNodeBuilder listeningAt(String host, int port) {
super.listeningAt(host, port);
return this;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisNode.RedisNodeBuilder#withName(java.lang.String)
*/
@Override
public RedisClusterNodeBuilder withName(String name) {
super.withName(name);
return this;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisNode.RedisNodeBuilder#withId(java.lang.String)
*/
@Override
public RedisClusterNodeBuilder withId(String id) {
super.withId(id);
return this;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisNode.RedisNodeBuilder#promotedAs(org.springframework.data.redis.connection.RedisNode.NodeType)
*/
@Override
public RedisClusterNodeBuilder promotedAs(NodeType nodeType) {
super.promotedAs(nodeType);
return this;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisNode.RedisNodeBuilder#slaveOf(java.lang.String)
*/
public RedisClusterNodeBuilder slaveOf(String masterId) {
super.slaveOf(masterId);
return this;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisNode.RedisNodeBuilder#replicaOf(java.lang.String)
*/
@Override
public RedisClusterNodeBuilder replicaOf(String masterId) {
super.replicaOf(masterId);
return this;
}
/**
* Set flags for node.
*
* @param flags
* @return
*/
public RedisClusterNodeBuilder withFlags(Set flags) {
this.flags = flags;
return this;
}
/**
* Set {@link SlotRange}.
*
* @param range
* @return
*/
public RedisClusterNodeBuilder serving(SlotRange range) {
this.slotRange = range;
return this;
}
/**
* Set {@link LinkState}.
*
* @param linkState
* @return
*/
public RedisClusterNodeBuilder linkState(LinkState linkState) {
this.linkState = linkState;
return this;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.connection.RedisNode.RedisNodeBuilder#build()
*/
@Override
public RedisClusterNode build() {
RedisNode base = super.build();
RedisClusterNode node;
if (base.host != null) {
node = new RedisClusterNode(base.getHost(), base.getPort(), slotRange);
} else {
node = new RedisClusterNode(slotRange);
}
node.id = base.id;
node.type = base.type;
node.masterId = base.masterId;
node.name = base.name;
node.flags = flags;
node.linkState = linkState;
return node;
}
}
}