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Extract the Redis subscription -> Vert.x event bus handler
The `SubscriptionHandler` does almost the same job, but has to be set on the `RedisConnection` explicitly (using the `handler()` method). In addition to forwarding the messages to the event bus, the new `SubscriptionHandler` also forwards subscription/unsubscriptions.
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src/main/java/io/vertx/redis/client/SubscriptionHandler.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package io.vertx.redis.client; | ||
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| import io.vertx.core.Handler; | ||
| import io.vertx.core.Vertx; | ||
| import io.vertx.core.eventbus.EventBus; | ||
| import io.vertx.core.internal.logging.Logger; | ||
| import io.vertx.core.internal.logging.LoggerFactory; | ||
| import io.vertx.core.json.JsonObject; | ||
| import io.vertx.redis.client.impl.types.Multi; | ||
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| /** | ||
| * A handler that can be installed on a Redis connection using {@link RedisConnection#handler(Handler)} | ||
| * in order to consume subscription messages and send them on the Vert.x {@linkplain Vertx#eventBus() event bus}. | ||
| * <p> | ||
| * By default, the address to which the messages are sent is {@code io.vertx.redis.<Redis channel>}. | ||
| * This can be changed by passing a different address prefix to {@link #create(Vertx, String)}. | ||
| * For example, if the prefix is {@code com.example}, the address is {@code com.example.<Redis channel>}. | ||
| */ | ||
| public class SubscriptionHandler implements Handler<Response> { | ||
| private static final Logger LOG = LoggerFactory.getLogger(SubscriptionHandler.class); | ||
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| private static final String DEFAULT_ADDRESS_PREFIX = "io.vertx.redis"; | ||
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| private final String prefix; | ||
| private final EventBus eventBus; | ||
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| /** | ||
| * Creates a subscription handler that forwards messages to the event bus of the given {@code vertx}. | ||
| * The default address prefix is used. | ||
| */ | ||
| public static SubscriptionHandler create(Vertx vertx) { | ||
| return new SubscriptionHandler(DEFAULT_ADDRESS_PREFIX, vertx.eventBus()); | ||
| } | ||
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| /** | ||
| * Creates a subscription handler that forwards messages to the event bus of the given {@code vertx}. | ||
| * The given address prefix is used. | ||
| */ | ||
| public static SubscriptionHandler create(Vertx vertx, String addressPrefix) { | ||
| return new SubscriptionHandler(addressPrefix, vertx.eventBus()); | ||
| } | ||
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| private SubscriptionHandler(String prefix, EventBus eventBus) { | ||
| this.prefix = prefix; | ||
| this.eventBus = eventBus; | ||
| } | ||
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| @Override | ||
| public void handle(Response reply) { | ||
| // pub/sub messages are arrays | ||
| if (reply instanceof Multi) { | ||
| // Detect valid published messages according to https://redis.io/topics/pubsub | ||
| String type = reply.get(0).toString(); | ||
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| if (reply.size() == 3 && "message".equals(type)) { | ||
| eventBus.send(prefix + "." + reply.get(1).toString(), | ||
| new JsonObject() | ||
| .put("status", "OK") | ||
| .put("type", type) | ||
| .put("value", new JsonObject() | ||
| .put("channel", reply.get(1).toString()) | ||
| .put("message", reply.get(2).toString()))); | ||
| return; | ||
| } | ||
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| if (reply.size() == 4 && "pmessage".equals(type)) { | ||
| eventBus.send(prefix + "." + reply.get(1).toString(), | ||
| new JsonObject() | ||
| .put("status", "OK") | ||
| .put("type", type) | ||
| .put("value", new JsonObject() | ||
| .put("pattern", reply.get(1).toString()) | ||
| .put("channel", reply.get(2).toString()) | ||
| .put("message", reply.get(3).toString()))); | ||
| return; | ||
| } | ||
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| if (reply.size() == 3 && ("subscribe".equals(type) || "psubscribe".equals(type) | ||
| || "unsubscribe".equals(type) || "punsubscribe".equals(type))) { | ||
| eventBus.send(prefix + "." + reply.get(1).toString(), | ||
| new JsonObject() | ||
| .put("status", "OK") | ||
| .put("type", type) | ||
| .put("value", new JsonObject() | ||
| .put("channel", reply.get(1).toString()) | ||
| .put("remaining", reply.get(2).toString()))); | ||
| return; | ||
| } | ||
| } | ||
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| LOG.warn("No handler waiting for message: " + reply); | ||
| } | ||
| } |
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