feat(database): offer default database impl

Signed-off-by: Jasper Lutz Severino <jasperlutzseverino@gmail.com>

database/guava/pom.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>discord-books-database</artifactId>
+        <groupId>com.lutzseverino.discordbooks</groupId>
+        <version>2.7.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <name>Discord Books Guava Database</name>
+    <artifactId>discord-books-database-guava</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>discord-books-core</artifactId>
+            <version>${project.version}</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+</project>

database/guava/src/main/java/com/lutzseverino/discordbooks/database/guava/GuavaDB.java

@@ -0,0 +1,30 @@
+package com.lutzseverino.discordbooks.database.guava;
+
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import com.lutzseverino.discordbooks.book.Book;
+import com.lutzseverino.discordbooks.database.BookDB;
+
+import java.util.concurrent.TimeUnit;
+
+public class GuavaDB implements BookDB {
+    private final Cache<String, Book> cache;
+
+    public GuavaDB() {
+        cache = CacheBuilder.newBuilder()
+                .expireAfterWrite(20, TimeUnit.MINUTES)
+                .build();
+    }
+
+    public GuavaDB(Cache<String, Book> cache) {
+        this.cache = cache;
+    }
+
+    @Override public Book get(String key) {
+        return cache.getIfPresent(key);
+    }
+
+    @Override public void set(String key, Book value) {
+        cache.put(key, value);
+    }
+}

database/pom.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>discord-books</artifactId>
+        <groupId>com.lutzseverino.discordbooks</groupId>
+        <version>2.7.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+    <packaging>pom</packaging>
+
+    <name>Discord Books Databases</name>
+    <modules>
+        <module>guava</module>
+        <module>redis</module>
+    </modules>
+    <artifactId>discord-books-database</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>com.google.guava</groupId>
+                <artifactId>guava</artifactId>
+                <version>31.1-jre</version>
+            </dependency>
+            <dependency>
+                <groupId>redis.clients</groupId>
+                <artifactId>jedis</artifactId>
+                <version>4.2.0</version>
+            </dependency>
+            <dependency>
+                <groupId>com.fasterxml.jackson.core</groupId>
+                <artifactId>jackson-databind</artifactId>
+                <version>2.13.3</version>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+</project>

database/redis/pom.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>discord-books-database</artifactId>
+        <groupId>com.lutzseverino.discordbooks</groupId>
+        <version>2.7.0</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <name>Discord Books Redis Database</name>
+    <artifactId>discord-books-database-redis</artifactId>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>discord-books-core</artifactId>
+            <version>${project.version}</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>redis.clients</groupId>
+            <artifactId>jedis</artifactId>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
+</project>

database/redis/src/main/java/com/lutzseverino/discordbooks/database/redis/JedisDB.java

@@ -0,0 +1,39 @@
+package com.lutzseverino.discordbooks.database.redis;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.lutzseverino.discordbooks.book.Book;
+import com.lutzseverino.discordbooks.database.BookDB;
+import redis.clients.jedis.JedisPool;
+import redis.clients.jedis.JedisPoolConfig;
+
+public class JedisDB implements BookDB {
+    private final ObjectMapper mapper = new ObjectMapper();
+    private final JedisPool pool;
+
+    public JedisDB() {
+        this.pool = new JedisPool(new JedisPoolConfig(), "localhost", 6379);
+    }
+
+    public JedisDB(JedisPool pool) {
+        this.pool = pool;
+    }
+
+    @Override public Book get(String key) {
+        try (var jedis = pool.getResource()) {
+            var json = jedis.get(key);
+            return json == null ? null : mapper.readValue(json, Book.class);
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    @Override public void set(String key, Book value) {
+        try (var jedis = pool.getResource()) {
+            jedis.set(key, mapper.writeValueAsString(value));
+        } catch (JsonProcessingException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

pom.xml

@@ -7,7 +7,7 @@
     <groupId>com.lutzseverino.discordbooks</groupId>
     <artifactId>discord-books</artifactId>
     <packaging>pom</packaging>
-    <version>2.1.3</version>
+    <version>2.7.0</version>
 
     <build>
         <plugins>
@@ -97,6 +97,7 @@
     <modules>
         <module>core</module>
         <module>jda</module>
+        <module>database</module>
     </modules>
 
     <properties>
@@ -122,6 +123,11 @@
                 <artifactId>annotations</artifactId>
                 <version>23.0.0</version>
             </dependency>
+            <dependency>
+                <groupId>com.fasterxml.jackson.core</groupId>
+                <artifactId>jackson-annotations</artifactId>
+                <version>2.13.3</version>
+            </dependency>
         </dependencies>
     </dependencyManagement>