RocksDB缓存实现，并更换默认实现为RocksDB

jodconverter-web/pom.xml

@@ -156,6 +156,11 @@
             <artifactId>concurrentlinkedhashmap-lru</artifactId>
             <version>1.4.2</version>
         </dependency>
+        <dependency>
+            <groupId>org.rocksdb</groupId>
+            <artifactId>rocksdbjni</artifactId>
+            <version>5.17.2</version>
+        </dependency>
     </dependencies>
     <build>
         <resources>

jodconverter-web/src/main/conf/application.properties

@@ -21,10 +21,11 @@ spring.http.multipart.max-file-size=100MB
 #openoffice home路径
 #office.home = C:\\Program Files (x86)\\OpenOffice 4
 
-#缓存实现类型，不配默认为JDK实现，可配置为redis实现（需要配置spring.redisson.address等参数）
+#缓存实现类型，不配默认为内嵌RocksDB实现，可配置为redis(type = redis)实现（需要配置spring.redisson.address等参数）和 JDK 内置对象实现（type = jdk）,
 #cache.type = redis
 #redis连接
 #spring.redisson.address = 192.168.1.204:6379
+#spring.redisson.password = xxx
 
 #######################################可在运行时动态配置#######################################
 #文本类型，默认如下，可自定义添加

jodconverter-web/src/main/java/cn/keking/service/cache/impl/CacheServiceJDKImpl.java

@@ -3,6 +3,7 @@ package cn.keking.service.cache.impl;
 import cn.keking.service.cache.CacheService;
 import com.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap;
 import com.googlecode.concurrentlinkedhashmap.Weighers;
+import org.rocksdb.RocksDB;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
 import org.springframework.stereotype.Service;
 
@@ -17,7 +18,7 @@ import java.util.concurrent.BlockingQueue;
  * @description
  */
 @Service
-@ConditionalOnExpression("'${cache.type:default}'.equals('default')")
+@ConditionalOnExpression("'${cache.type:default}'.equals('jdk')")
 public class CacheServiceJDKImpl implements CacheService {
 
     private Map<String, String> pdfCache;

jodconverter-web/src/main/java/cn/keking/service/cache/impl/CacheServiceRocksDBImpl.java

@@ -0,0 +1,170 @@
+package cn.keking.service.cache.impl;
+
+import cn.keking.service.cache.CacheService;
+import org.artofsolving.jodconverter.office.OfficeUtils;
+import org.rocksdb.RocksDB;
+import org.rocksdb.RocksDBException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
+import org.springframework.stereotype.Service;
+
+import java.io.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+
+/**
+ * @auther: chenjh
+ * @time: 2019/4/22 11:02
+ * @description
+ */
+@ConditionalOnExpression("'${cache.type:default}'.equals('default')")
+@Service
+public class CacheServiceRocksDBImpl implements CacheService {
+
+    static {
+        RocksDB.loadLibrary();
+    }
+
+    private static final String DB_PATH = OfficeUtils.getHomePath() + File.separator + "cache";
+
+    private static final int QUEUE_SIZE = 500000;
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(CacheServiceRocksDBImpl.class);
+
+    private BlockingQueue blockingQueue = new ArrayBlockingQueue(QUEUE_SIZE);
+
+    private RocksDB db;
+
+    {
+        try {
+            db = RocksDB.open(DB_PATH);
+            if (db.get(REDIS_FILE_PREVIEW_PDF_KEY.getBytes()) == null) {
+                Map<String, String> initPDFCache = new HashMap<>();
+                db.put(REDIS_FILE_PREVIEW_PDF_KEY.getBytes(), toByteArray(initPDFCache));
+            }
+            if (db.get(REDIS_FILE_PREVIEW_IMGS_KEY.getBytes()) == null) {
+                Map<String, List<String>> initIMGCache = new HashMap<>();
+                db.put(REDIS_FILE_PREVIEW_IMGS_KEY.getBytes(), toByteArray(initIMGCache));
+            }
+        } catch (RocksDBException | IOException e) {
+            LOGGER.error("Uable to init RocksDB" + e);
+        }
+    }
+
+
+    @Override
+    public void initPDFCachePool(Integer capacity) {
+
+    }
+
+    @Override
+    public void initIMGCachePool(Integer capacity) {
+
+    }
+
+    @Override
+    public void putPDFCache(String key, String value) {
+        try {
+            Map<String, String> pdfCacheItem = new HashMap<>();
+            pdfCacheItem.put(key, value);
+            db.put(REDIS_FILE_PREVIEW_PDF_KEY.getBytes(), toByteArray(pdfCacheItem));
+        } catch (RocksDBException | IOException e) {
+            LOGGER.error("Put into RocksDB Exception" + e);
+        }
+    }
+
+    @Override
+    public void putImgCache(String key, List<String> value) {
+        try {
+            Map<String, List<String>> imgCacheItem = new HashMap<>();
+            imgCacheItem.put(key, value);
+            db.put(REDIS_FILE_PREVIEW_PDF_KEY.getBytes(), toByteArray(imgCacheItem));
+        } catch (RocksDBException | IOException e) {
+            LOGGER.error("Put into RocksDB Exception" + e);
+        }
+    }
+
+    @Override
+    public Map<String, String> getPDFCache() {
+        Map<String, String> result = new HashMap<>();
+        try{
+            result = (Map<String, String>) toObject(db.get(REDIS_FILE_PREVIEW_PDF_KEY.getBytes()));
+        } catch (RocksDBException | IOException | ClassNotFoundException e) {
+            LOGGER.error("Get from RocksDB Exception" + e);
+        }
+        return result;
+    }
+
+    @Override
+    public String getPDFCache(String key) {
+        String result = "";
+        try{
+            Map<String, String> map = (Map<String, String>) toObject(db.get(REDIS_FILE_PREVIEW_PDF_KEY.getBytes()));
+            result = map.get(key);
+        } catch (RocksDBException | IOException | ClassNotFoundException e) {
+            LOGGER.error("Get from RocksDB Exception" + e);
+        }
+        return result;
+    }
+
+    @Override
+    public Map<String, List<String>> getImgCache() {
+        Map<String, List<String>> result = new HashMap<>();
+        try{
+            result = (Map<String, List<String>>) toObject(db.get(REDIS_FILE_PREVIEW_IMGS_KEY.getBytes()));
+        } catch (RocksDBException | IOException | ClassNotFoundException e) {
+            LOGGER.error("Get from RocksDB Exception" + e);
+        }
+        return result;
+    }
+
+    @Override
+    public List<String> getImgCache(String key) {
+        List<String> result = new ArrayList<>();
+        Map<String, List<String>> map;
+        try{
+            map = (Map<String, List<String>>) toObject(db.get(REDIS_FILE_PREVIEW_IMGS_KEY.getBytes()));
+            result = map.get(key);
+        } catch (RocksDBException | IOException | ClassNotFoundException e) {
+            LOGGER.error("Get from RocksDB Exception" + e);
+        }
+        return result;
+    }
+
+    @Override
+    public void addQueueTask(String url) {
+        blockingQueue.add(url);
+    }
+
+    @Override
+    public String takeQueueTask() throws InterruptedException {
+        return String.valueOf(blockingQueue.take());
+    }
+
+    private byte[] toByteArray (Object obj) throws IOException {
+        byte[] bytes = null;
+        ByteArrayOutputStream bos = new ByteArrayOutputStream();
+        ObjectOutputStream oos = new ObjectOutputStream(bos);
+        oos.writeObject(obj);
+        oos.flush();
+        bytes = bos.toByteArray ();
+        oos.close();
+        bos.close();
+        return bytes;
+    }
+
+    private Object toObject (byte[] bytes) throws IOException, ClassNotFoundException {
+        Object obj = null;
+        ByteArrayInputStream bis = new ByteArrayInputStream (bytes);
+        ObjectInputStream ois = new ObjectInputStream (bis);
+        obj = ois.readObject();
+        ois.close();
+        bis.close();
+        return obj;
+    }
+}