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Implemented bucket repository

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This commit is contained in:
Andrey Terentev 2023-11-16 12:45:54 +07:00
parent f9547b9cbe
commit ab446e7160
6 changed files with 240 additions and 4 deletions
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7
src/main/java/ru/dragonestia/loadbalancer/model/Bucket.java
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@ -1,11 +1,12 @@
package ru.dragonestia.loadbalancer.model;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.RequiredArgsConstructor;
import ru.dragonestia.loadbalancer.model.type.SlotLimit;
@Getter
@RequiredArgsConstructor
@RequiredArgsConstructor(access = AccessLevel.PRIVATE)
public class Bucket {
private final String identifier;
@ -14,6 +15,10 @@ public class Bucket {
private final String payload;
private boolean locked = false;
public static Bucket create(String identifier, Node node, SlotLimit limit, String payload) {
return new Bucket(identifier, node.identifier(), limit, payload);
}
public void setLocked(boolean value) {
locked = value;
}

18
src/main/java/ru/dragonestia/loadbalancer/model/Node.java
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@ -3,4 +3,20 @@ package ru.dragonestia.loadbalancer.model;
import lombok.NonNull;
import ru.dragonestia.loadbalancer.model.type.LoadBalancingMethod;
public record Node(@NonNull String identifier, @NonNull LoadBalancingMethod method) {}
public record Node(@NonNull String identifier, @NonNull LoadBalancingMethod method) {
@Override
public int hashCode() {
return identifier.hashCode();
}
@Override
public boolean equals(Object object) {
if (object == this) return true;
if (object == null) return false;
if (object instanceof Node other) {
return identifier.equals(other.identifier);
}
return false;
}
}

34
src/main/java/ru/dragonestia/loadbalancer/repository/BucketRepository.java Normal file
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@ -0,0 +1,34 @@
package ru.dragonestia.loadbalancer.repository;
import ru.dragonestia.loadbalancer.model.Bucket;
import ru.dragonestia.loadbalancer.model.Node;
import ru.dragonestia.loadbalancer.model.User;
import java.util.Collection;
import java.util.List;
import java.util.Optional;
public interface BucketRepository {
void createBucket(Bucket bucket);
void removeBucket(Bucket bucket);
Optional<Bucket> findBucket(Node node, String identifier);
List<Bucket> all(Node node);
default int countAvailableBuckets(Node node) {
return countAvailableBuckets(node, 0);
}
int countAvailableBuckets(Node node, int requiredSlots);
Optional<Bucket> pickFreeBucket(Node node, Collection<User> users);
void freeBucket(Bucket bucket, Collection<User> users);
void onCreateNode(Node node);
void onRemoveNode(Node node);
}

4
src/main/java/ru/dragonestia/loadbalancer/repository/UserRepository.java
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@ -13,4 +13,8 @@ public interface UserRepository {
void unlinkWithBucket(Bucket bucket, Collection<User> users);
List<Bucket> findAllLinkedUserBuckets(User user);
int tryUnlinkWithBucket(Bucket bucket, Collection<User> users);
void onRemoveBucket(Bucket bucket);
}

142
src/main/java/ru/dragonestia/loadbalancer/repository/impl/BucketRepositoryImpl.java Normal file
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@ -0,0 +1,142 @@
package ru.dragonestia.loadbalancer.repository.impl;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Repository;
import ru.dragonestia.loadbalancer.model.Bucket;
import ru.dragonestia.loadbalancer.model.Node;
import ru.dragonestia.loadbalancer.model.User;
import ru.dragonestia.loadbalancer.repository.BucketRepository;
import ru.dragonestia.loadbalancer.repository.UserRepository;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
@Repository
@RequiredArgsConstructor
public class BucketRepositoryImpl implements BucketRepository {
private final UserRepository userRepository;
private final Map<Node, Buckets> node2bucketsMap = new ConcurrentHashMap<>();
@Override
public void createBucket(Bucket bucket) {
var nodeId = bucket.getNodeIdentifier();
var node = node2bucketsMap.keySet().stream()
.filter(n -> bucket.getNodeIdentifier().equals(n.identifier()))
.findFirst();
synchronized (node2bucketsMap) {
if (node.isEmpty()) {
throw new IllegalArgumentException("Node '" + nodeId + "' does not exist");
}
node2bucketsMap.get(node.get()).put(bucket.getIdentifier(), new BucketContainer(bucket, new AtomicInteger(0)));
}
}
@Override
public void removeBucket(Bucket bucket) {
var nodeId = bucket.getNodeIdentifier();
var node = node2bucketsMap.keySet().stream()
.filter(n -> bucket.getNodeIdentifier().equals(n.identifier()))
.findFirst();
synchronized (node2bucketsMap) {
if (node.isEmpty()) {
throw new IllegalArgumentException("Node '" + nodeId + "' does not exist");
}
node2bucketsMap.get(node.get()).remove(bucket.getIdentifier());
}
}
@Override
public Optional<Bucket> findBucket(Node node, String identifier) {
synchronized (node2bucketsMap) {
if (!node2bucketsMap.containsKey(node)) {
throw new IllegalArgumentException("Node '" + node.identifier() + "' does not exist");
}
var result = node2bucketsMap.get(node).getOrDefault(identifier, null);
return result == null? Optional.empty() : Optional.of(result.bucket());
}
}
@Override
public List<Bucket> all(Node node) {
synchronized (node2bucketsMap) {
return node2bucketsMap.get(node).values().stream().map(BucketContainer::bucket).toList();
}
}
@Override
public int countAvailableBuckets(Node node, int requiredSlots) {
return (int) node2bucketsMap.get(node).values().stream()
.filter(bucket -> bucket.isAvailable(requiredSlots))
.count();
}
@Override
public Optional<Bucket> pickFreeBucket(Node node, Collection<User> users) {
synchronized (node2bucketsMap) {
if (!node2bucketsMap.containsKey(node)) {
throw new IllegalArgumentException("Node '" + node.identifier() + "' does not exist");
}
var requiredSlots = users.size();
var container = node2bucketsMap.get(node).values().stream()
.filter(b -> b.isAvailable(requiredSlots))
.findFirst();
return container.map(BucketContainer::bucket);
}
}
@Override
public void freeBucket(Bucket bucket, Collection<User> users) {
var nodeId = bucket.getNodeIdentifier();
var node = node2bucketsMap.keySet().stream()
.filter(n -> bucket.getNodeIdentifier().equals(n.identifier()))
.findFirst();
synchronized (node2bucketsMap) {
if (node.isEmpty()) {
throw new IllegalArgumentException("Node '" + nodeId + "' does not exist");
}
var buckets = node2bucketsMap.get(node.get());
if (!buckets.containsKey(bucket.getIdentifier())) {
throw new IllegalArgumentException("Bucket '" + nodeId + "' does not exist");
}
var delta = userRepository.tryUnlinkWithBucket(bucket, users);
if (buckets.get(bucket.getIdentifier()).used().getAndAdd(-delta) < 0) {
throw new RuntimeException("Bucket has less than 0 users");
}
}
}
@Override
public void onCreateNode(Node node) {
synchronized (node2bucketsMap) {
node2bucketsMap.put(node, new Buckets());
}
}
@Override
public void onRemoveNode(Node node) {
synchronized (node2bucketsMap) {
node2bucketsMap.remove(node);
}
}
private record BucketContainer(Bucket bucket, AtomicInteger used) {
public boolean isAvailable(int requiredSlots) {
return bucket.isAvailable(used.get(), requiredSlots);
}
}
private static class Buckets extends LinkedHashMap<String, BucketContainer> {}
}

37
src/main/java/ru/dragonestia/loadbalancer/repository/impl/UserRepositoryImpl.java
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@ -2,12 +2,12 @@ package ru.dragonestia.loadbalancer.repository.impl;
import org.springframework.stereotype.Repository;
import ru.dragonestia.loadbalancer.model.Bucket;
import ru.dragonestia.loadbalancer.model.Node;
import ru.dragonestia.loadbalancer.model.User;
import ru.dragonestia.loadbalancer.repository.UserRepository;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicInteger;
@Repository
public class UserRepositoryImpl implements UserRepository {
@ -31,10 +31,15 @@ public class UserRepositoryImpl implements UserRepository {
for (var user: users) {
var set = usersMap.getOrDefault(user, new HashSet<>());
set.remove(bucket);
if (set.isEmpty()) {
usersMap.remove(user);
} else {
usersMap.put(user, set);
}
}
}
}
@Override
public List<Bucket> findAllLinkedUserBuckets(User user) {
@ -42,4 +47,34 @@ public class UserRepositoryImpl implements UserRepository {
return usersMap.getOrDefault(user, new HashSet<>()).stream().toList();
}
}
@Override
public int tryUnlinkWithBucket(Bucket bucket, Collection<User> users) {
var counter = new AtomicInteger();
synchronized (usersMap) {
usersMap.forEach((user, set) -> {
if (!set.contains(bucket)) return;
set.remove(bucket);
counter.incrementAndGet();
if (set.isEmpty()) {
usersMap.remove(user);
}
});
}
return counter.get();
}
@Override
public void onRemoveBucket(Bucket bucket) {
synchronized (usersMap) {
usersMap.forEach((user, set) -> {
set.remove(bucket);
if (set.isEmpty()) {
usersMap.remove(user);
}
});
}
}
}