feat: added a working connection to Redis, and a scaffolding for the RESTful APIHEADmaster

1 files changed, 44 insertions, 0 deletions

diff --git a/opendc-common/src/main/kotlin/org/opendc/common/utils/Redis.kt b/opendc-common/src/main/kotlin/org/opendc/common/utils/Redis.kt
new file mode 100644
index 00000000..67547778
--- /dev/null
+++ b/opendc-common/src/main/kotlin/org/opendc/common/utils/Redis.kt
@@ -0,0 +1,44 @@
+package org.opendc.common.utils
+
+import com.fasterxml.jackson.dataformat.toml.TomlMapper
+import redis.clients.jedis.RedisClient
+import redis.clients.jedis.StreamEntryID
+import redis.clients.jedis.params.XReadParams
+import java.util.Properties
+
+/**
+ * This class represents the Redis server instance.
+ * @author Mateusz Kwiatkowski
+ * @see <a href=https://redis.io/docs/latest/>https://redis.io/docs/latest/</a>
+ *
+ * @see <a href=https://redis.io/docs/latest/develop/data-types/streams/>https://redis.io/docs/latest/develop/data-types/streams/</a>
+ */
+
+@Suppress("DEPRECATION")
+public class Redis {
+    private var properties : Properties
+
+    init {
+        properties  = TomlMapper().readerFor(Properties().javaClass)
+            .readValue(Kafka::class.java.getResource("/producer.toml"))
+    }
+
+        public fun run() {
+            val jedis : RedisClient = RedisClient.create("redis://localhost:6379")
+
+            val res5 = jedis.xread(
+                XReadParams.xReadParams().block(300).count(100),
+                object : HashMap<String?, StreamEntryID?>() {
+                    init {
+                        put("${properties.getProperty("table")}", StreamEntryID())
+                    }
+                })
+
+            // in Redis you can subscribe to updates to a stream.
+            // you should base your application off this.
+            // you can listen for new items with XREAD
+            println(res5)
+            jedis.close()
+        }
+
+}
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