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Recompute cached value when the Redis connection fails #35977

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merged 1 commit into from
Sep 18, 2023
Merged

Recompute cached value when the Redis connection fails #35977

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46 changes: 33 additions & 13 deletions ...ions/redis-cache/runtime/src/main/java/io/quarkus/cache/redis/runtime/RedisCacheImpl.java
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
package io.quarkus.cache.redis.runtime;

import java.net.ConnectException;
import java.nio.charset.StandardCharsets;
import java.time.Duration;
import java.util.List;
Expand All @@ -10,6 +11,8 @@
import java.util.function.Predicate;
import java.util.function.Supplier;

import org.jboss.logging.Logger;

import io.quarkus.arc.Arc;
import io.quarkus.arc.ArcContainer;
import io.quarkus.cache.CacheException;
Expand All @@ -35,6 +38,8 @@
*/
public class RedisCacheImpl extends AbstractCache implements RedisCache {

private static final Logger log = Logger.getLogger(RedisCacheImpl.class);

private static final Map<String, Class<?>> PRIMITIVE_TO_CLASS_MAPPING = Map.of(
"int", Integer.class,
"byte", Byte.class,
Expand Down Expand Up @@ -123,6 +128,19 @@ private <K> String encodeKey(K key) {
return new String(marshaller.encode(key), StandardCharsets.UTF_8);
}

private <K, V> Uni<V> computeValue(K key, Function<K, V> valueLoader, boolean isWorkerThread) {
if (isWorkerThread) {
return Uni.createFrom().item(new Supplier<V>() {
@Override
public V get() {
return valueLoader.apply(key);
}
}).runSubscriptionOn(MutinyHelper.blockingExecutor(vertx.getDelegate()));
} else {
return Uni.createFrom().item(valueLoader.apply(key));
}
}

@Override
public <K, V> Uni<V> get(K key, Class<V> clazz, Function<K, V> valueLoader) {
// With optimistic locking:
Expand All @@ -148,17 +166,7 @@ public Uni<V> apply(V cached) throws Exception {
if (cached != null) {
return Uni.createFrom().item(new StaticSupplier<>(cached));
} else {
Uni<V> uni;
if (isWorkerThread) {
uni = Uni.createFrom().item(new Supplier<V>() {
@Override
public V get() {
return valueLoader.apply(key);
}
}).runSubscriptionOn(MutinyHelper.blockingExecutor(vertx.getDelegate()));
} else {
uni = Uni.createFrom().item(valueLoader.apply(key));
}
Uni<V> uni = computeValue(key, valueLoader, isWorkerThread);

return uni.onItem().call(new Function<V, Uni<?>>() {
@Override
Expand All @@ -185,7 +193,15 @@ public Uni<?> apply(V value) {
}
}));
}
});
})

.onFailure(ConnectException.class).recoverWithUni(new Function<Throwable, Uni<? extends V>>() {
@Override
public Uni<? extends V> apply(Throwable e) {
log.warn("Unable to connect to Redis, recomputing cached value", e);
return computeValue(key, valueLoader, isWorkerThread);
}
});
}

@Override
Expand Down Expand Up @@ -215,7 +231,11 @@ public Uni<V> apply(RedisConnection connection) {
}
});
}
});
})
.onFailure(ConnectException.class).recoverWithUni(e -> {
log.warn("Unable to connect to Redis, recomputing cached value", e);
return valueLoader.apply(key);
});
}

@Override
Expand Down
45 changes: 44 additions & 1 deletion .../redis-cache/runtime/src/test/java/io/quarkus/cache/redis/runtime/RedisCacheImplTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,12 @@ class RedisCacheImplTest extends RedisCacheTestBase {

@AfterEach
void clear() {
redis.send(Request.cmd(Command.FLUSHALL).arg("SYNC")).await().atMost(Duration.ofSeconds(10));
try {
redis.send(Request.cmd(Command.FLUSHALL).arg("SYNC")).await()
.atMost(Duration.ofSeconds(10));
} catch (Exception ignored) {
// ignored.
}
}

@Test
Expand All @@ -45,6 +50,18 @@ public void testPutInTheCache() {
assertThat(r).isNotNull();
}

@Test
public void testPutInTheCacheWithoutRedis() {
String k = UUID.randomUUID().toString();
RedisCacheInfo info = new RedisCacheInfo();
info.name = "foo";
info.valueType = String.class.getName();
info.expireAfterWrite = Optional.of(Duration.ofSeconds(2));
RedisCacheImpl cache = new RedisCacheImpl(info, vertx, redis, BLOCKING_ALLOWED);
server.close();
assertThat(cache.get(k, s -> "hello").await().indefinitely()).isEqualTo("hello");
}

@Test
public void testPutInTheCacheWithOptimisticLocking() {
String k = UUID.randomUUID().toString();
Expand Down Expand Up @@ -355,6 +372,32 @@ void testAsyncGetWithDefaultType() {
}));
}

@Test
void testAsyncGetWithDefaultTypeWithoutRedis() {
RedisCacheInfo info = new RedisCacheInfo();
info.name = "star-wars";
info.expireAfterWrite = Optional.of(Duration.ofSeconds(2));
info.valueType = Person.class.getName();
RedisCacheImpl cache = new RedisCacheImpl(info, vertx, redis, BLOCKING_ALLOWED);

server.close();

assertThat(cache
.getAsync("test",
x -> Uni.createFrom().item(new Person("luke", "skywalker"))
.runSubscriptionOn(Infrastructure.getDefaultExecutor()))
.await().indefinitely()).satisfies(p -> {
assertThat(p.firstName).isEqualTo("luke");
assertThat(p.lastName).isEqualTo("skywalker");
});

assertThat(cache.getAsync("test", x -> Uni.createFrom().item(new Person("leia", "organa")))
.await().indefinitely()).satisfies(p -> {
assertThat(p.firstName).isEqualTo("leia");
assertThat(p.lastName).isEqualTo("organa");
});
}

@Test
void testAsyncGetWithDefaultTypeWithOptimisticLocking() {
RedisCacheInfo info = new RedisCacheInfo();
Expand Down
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