com.github.bootfastconfig.cache.redis.MyRedisCacheWriter Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of boot-fast-config-cache Show documentation
Show all versions of boot-fast-config-cache Show documentation
Parent pom providing dependency and plugin management for applications
built with Maven
The newest version!
package com.github.bootfastconfig.cache.redis;
import org.springframework.dao.PessimisticLockingFailureException;
import org.springframework.data.redis.cache.RedisCacheWriter;
import org.springframework.data.redis.connection.RedisConnection;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.RedisStringCommands;
import org.springframework.data.redis.core.types.Expiration;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import java.nio.charset.StandardCharsets;
import java.time.Duration;
import java.util.Collections;
import java.util.Optional;
import java.util.concurrent.TimeUnit;
import java.util.function.Consumer;
import java.util.function.Function;
public class MyRedisCacheWriter implements RedisCacheWriter {
private final RedisConnectionFactory connectionFactory;
private final Duration sleepTime;
/**
* Instantiates a new Winjoin redis cache writer.
*
* @param connectionFactory must not be {@literal null}.
*/
MyRedisCacheWriter(RedisConnectionFactory connectionFactory) {
this(connectionFactory, Duration.ZERO);
}
/**
* Instantiates a new Winjoin redis cache writer.
*
* @param connectionFactory must not be {@literal null}.
* @param sleepTime sleep time between lock request attempts. Must not be {@literal null}. Use {@link Duration#ZERO} to disable locking.
*/
MyRedisCacheWriter(RedisConnectionFactory connectionFactory, Duration sleepTime) {
Assert.notNull(connectionFactory, "ConnectionFactory must not be null!");
Assert.notNull(sleepTime, "SleepTime must not be null!");
this.connectionFactory = connectionFactory;
this.sleepTime = sleepTime;
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.cache.RedisCacheWriter#put(java.lang.String, byte[], byte[], java.time.Duration)
*/
@Override
public void put(String name, byte[] key, byte[] value, @Nullable Duration ttl) {
Assert.notNull(name, "Name must not be null!");
Assert.notNull(key, "Key must not be null!");
Assert.notNull(value, "Value must not be null!");
execute(name, connection -> {
if (shouldExpireWithin(ttl)) {
connection.set(key, value, Expiration.from(ttl.toMillis(), TimeUnit.MILLISECONDS), RedisStringCommands.SetOption.upsert());
} else {
connection.set(key, value);
}
return "OK";
});
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.cache.RedisCacheWriter#get(java.lang.String, byte[])
*/
@Override
public byte[] get(String name, byte[] key) {
Assert.notNull(name, "Name must not be null!");
Assert.notNull(key, "Key must not be null!");
return execute(name, connection -> connection.get(key));
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.cache.RedisCacheWriter#putIfAbsent(java.lang.String, byte[], byte[], java.time.Duration)
*/
@Override
public byte[] putIfAbsent(String name, byte[] key, byte[] value, @Nullable Duration ttl) {
Assert.notNull(name, "Name must not be null!");
Assert.notNull(key, "Key must not be null!");
Assert.notNull(value, "Value must not be null!");
return execute(name, connection -> {
if (isLockingCacheWriter()) {
doLock(name, connection);
}
try {
if (connection.setNX(key, value)) {
if (shouldExpireWithin(ttl)) {
connection.pExpire(key, ttl.toMillis());
}
return null;
}
return connection.get(key);
} finally {
if (isLockingCacheWriter()) {
doUnlock(name, connection);
}
}
});
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.cache.RedisCacheWriter#remove(java.lang.String, byte[])
*/
@Override
public void remove(String name, byte[] key) {
Assert.notNull(name, "Name must not be null!");
Assert.notNull(key, "Key must not be null!");
execute(name, connection -> connection.del(key));
}
/*
* (non-Javadoc)
* @see org.springframework.data.redis.cache.RedisCacheWriter#clean(java.lang.String, byte[])
*/
@Override
public void clean(String name, byte[] pattern) {
Assert.notNull(name, "Name must not be null!");
Assert.notNull(pattern, "Pattern must not be null!");
execute(name, connection -> {
boolean wasLocked = false;
try {
if (isLockingCacheWriter()) {
doLock(name, connection);
wasLocked = true;
}
byte[][] keys = Optional.ofNullable(connection.keys(pattern)).orElse(Collections.emptySet())
.toArray(new byte[0][]);
if (keys.length > 0) {
connection.del(keys);
}
} finally {
if (wasLocked && isLockingCacheWriter()) {
doUnlock(name, connection);
}
}
return "OK";
});
}
/**
* Explicitly set a write lock on a cache.
*
* @param name the name of the cache to lock.
*/
void lock(String name) {
execute(name, connection -> doLock(name, connection));
}
/**
* Explicitly remove a write lock from a cache.
*
* @param name the name of the cache to unlock.
*/
void unlock(String name) {
executeLockFree(connection -> doUnlock(name, connection));
}
private Boolean doLock(String name, RedisConnection connection) {
return connection.setNX(createCacheLockKey(name), new byte[0]);
}
private Long doUnlock(String name, RedisConnection connection) {
return connection.del(createCacheLockKey(name));
}
/**
* Do check lock boolean.
*
* @param name the name
* @param connection the connection
* @return the boolean
*/
boolean doCheckLock(String name, RedisConnection connection) {
return connection.exists(createCacheLockKey(name));
}
/**
* @return {@literal true} if {@link RedisCacheWriter} uses locks.
*/
private boolean isLockingCacheWriter() {
return !sleepTime.isZero() && !sleepTime.isNegative();
}
private T execute(String name, Function callback) {
RedisConnection connection = connectionFactory.getConnection();
try {
checkAndPotentiallyWaitUntilUnlocked(name, connection);
return callback.apply(connection);
} finally {
connection.close();
}
}
private void executeLockFree(Consumer callback) {
RedisConnection connection = connectionFactory.getConnection();
try {
callback.accept(connection);
} finally {
connection.close();
}
}
private void checkAndPotentiallyWaitUntilUnlocked(String name, RedisConnection connection) {
if (!isLockingCacheWriter()) {
return;
}
try {
while (doCheckLock(name, connection)) {
Thread.sleep(sleepTime.toMillis());
}
} catch (InterruptedException ex) {
// Re-interrupt current thread, to allow other participants to react.
Thread.currentThread().interrupt();
throw new PessimisticLockingFailureException(String.format("Interrupted while waiting to unlock cache %s", name),
ex);
}
}
private boolean shouldExpireWithin(@Nullable Duration ttl) {
return ttl != null && !ttl.isZero() && !ttl.isNegative();
}
private byte[] createCacheLockKey(String name) {
return (name + "~lock").getBytes(StandardCharsets.UTF_8);
}
}