365.add support of custom codecs in topics

topic/src/main/java/tech/ydb/topic/TopicClient.java

@@ -8,6 +8,7 @@
 import tech.ydb.core.Result;
 import tech.ydb.core.Status;
 import tech.ydb.core.grpc.GrpcTransport;
+import tech.ydb.topic.description.Codec;
 import tech.ydb.topic.description.ConsumerDescription;
 import tech.ydb.topic.description.TopicDescription;
 import tech.ydb.topic.impl.GrpcTopicRpc;
@@ -164,6 +165,14 @@ default CompletableFuture<Result<ConsumerDescription>> describeConsumer(String p
     @Override
     void close();
 
+    /**
+     * Register custom codec implementation to TopicClient     *
+     *
+     * @param codec - custom implementation
+     */
+    void registerCodec(Codec codec);
+
+
     /**
      * BUILDER
      */

topic/src/main/java/tech/ydb/topic/description/Codec.java

@@ -1,12 +1,83 @@
 package tech.ydb.topic.description;
 
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
 /**
+
+ *
+ * Interface for custom codec implementation.
+ * <p>
+ *
+ * You can use custom codec as below
+ * 1. Implement interface methods
+ *    Specify getId which return value more than 10000. This value identify codec across others
+ * 2. Use code below to write data
+ *   Codec codecImpl = ....
+ *   Topic client = TopicClient.newClient(ydbTransport).build();
+ * <p>
+ *   client.registerCodec(codecImpl);
+ *   WriterSettings settings = WriterSettings.newBuilder()
+ *                 .setTopicPath(topicName)
+ *                 .setCodec(codecId)
+ *                 .build();
+ * <p>
+ *    SyncWriter writer = client.createSyncWriter(settings);
+ * <p>
+ * 3. Use to read data. Codec should be registered in {@link CodecRegistry}
+ *   Codec codecImpl = ....
+ *   Topic client = TopicClient.newClient(ydbTransport).build();
+ * <p>
+ *   ReaderSettings readerSettings = ReaderSettings.newBuilder()
+ *                  .addTopic(TopicReadSettings.newBuilder().setPath(topicName).build())
+ *                  .setConsumerName(TEST_CONSUMER1)
+ *                  .build();
+ * <p>
+ *   SyncReader reader = client.createSyncReader(readerSettings);
+ *
  * @author Nikolay Perfilov
  */
-public enum Codec {
-    RAW,
-    GZIP,
-    LZOP,
-    ZSTD,
-    CUSTOM;
+public interface Codec {
+    int RAW = 1;
+    int GZIP = 2;
+    int LZOP = 3;
+    int ZSTD = 4;
+    int CUSTOM = 10000;
+
+    /**
+     * Check is codec is reserved
+     *
+     * @param codec codec id
+     * @return true - codec id is reserved; false - elsewhere
+     */
+    default boolean isReserved(int codec) {
+        return codec <= CUSTOM;
+    }
+
+    /**
+     * Get codec identifier
+     * @return codec identifier
+     */
+    int getId();
+
+    /**
+     * Decode data
+     *
+     * @param byteArrayInputStream input stream
+     * @return output stream
+     * @throws IOException throws when error occurs
+     */
+
+    InputStream decode(InputStream byteArrayInputStream) throws IOException;
+
+    /**
+     * Encode data
+     *
+     * @param byteArrayOutputStream output stream
+     * @return output stream
+     * @throws IOException throws when error occurs
+     */
+    OutputStream encode(OutputStream byteArrayOutputStream) throws IOException;
+
 }

topic/src/main/java/tech/ydb/topic/description/CodecRegistry.java

@@ -0,0 +1,67 @@
+package tech.ydb.topic.description;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import tech.ydb.topic.impl.GzipCodec;
+import tech.ydb.topic.impl.LzopCodec;
+import tech.ydb.topic.impl.RawCodec;
+import tech.ydb.topic.impl.ZstdCodec;
+
+/**
+ * Register for custom topic codec. Local to TopicClient
+ *
+ * @author Evgeny Kuvardin
+ **/
+public class CodecRegistry {
+
+    private static final Logger logger = LoggerFactory.getLogger(CodecRegistry.class);
+
+    final Map<Integer, Codec> customCodecMap;
+
+    public CodecRegistry() {
+        customCodecMap = new HashMap<>();
+        customCodecMap.put(Codec.RAW, RawCodec.getInstance());
+        customCodecMap.put(Codec.GZIP, GzipCodec.getInstance());
+        customCodecMap.put(Codec.LZOP, LzopCodec.getInstance());
+        customCodecMap.put(Codec.ZSTD, ZstdCodec.getInstance());
+    }
+
+    /**
+     * Register codec implementation
+     * @param codec codec implementation
+     * @return previous implementation with associated codec
+     */
+    public Codec registerCodec(Codec codec) {
+        assert codec != null;
+        int codecId = codec.getId();
+
+        if (codec.isReserved(codecId)) {
+            throw new RuntimeException(
+                    "Create custom codec for reserved code not allowed: " + codec + " .Use code more than 10000");
+        }
+        Codec result = customCodecMap.put(codecId, codec);
+
+        if (result != null) {
+            logger.info(
+                    "Replace codec which have already associated with this id. CodecId: {} Codec: {}",
+                    codecId,
+                    result);
+        }
+
+        return result;
+    }
+
+    /**
+     * Get codec implementation by associated id
+     * @param codecId codec identifier
+     * @return codec implementation
+     */
+    public Codec getCodec(int codecId) {
+        return customCodecMap.get(codecId);
+    }
+
+}

topic/src/main/java/tech/ydb/topic/description/Consumer.java

@@ -23,7 +23,7 @@ public class Consumer {
     private final String name;
     private final boolean important;
     private final Instant readFrom;
-    private final List<Codec> supportedCodecs;
+    private final List<Integer> supportedCodecs;
     private final Map<String, String> attributes;
     private final ConsumerStats stats;
 
@@ -68,7 +68,7 @@ public SupportedCodecs getSupportedCodecs() {
         return new SupportedCodecs(supportedCodecs);
     }
 
-    public List<Codec> getSupportedCodecsList() {
+    public List<Integer> getSupportedCodecsList() {
         return supportedCodecs;
     }
 
@@ -88,7 +88,7 @@ public static class Builder {
         private String name;
         private boolean important = false;
         private Instant readFrom = null;
-        private List<Codec> supportedCodecs = new ArrayList<>();
+        private List<Integer> supportedCodecs = new ArrayList<>();
         private Map<String, String> attributes = new HashMap<>();
         private ConsumerStats stats = null;
 
@@ -107,7 +107,7 @@ public Builder setReadFrom(Instant readFrom) {
             return this;
         }
 
-        public Builder addSupportedCodec(Codec codec) {
+        public Builder addSupportedCodec(int codec) {
             this.supportedCodecs.add(codec);
             return this;
         }

topic/src/main/java/tech/ydb/topic/description/SupportedCodecs.java

@@ -9,17 +9,17 @@
  * @author Nikolay Perfilov
  */
 public class SupportedCodecs {
-    private final List<Codec> codecs;
+    private final List<Integer> codecs;
 
     public SupportedCodecs(Builder builder) {
         this.codecs = ImmutableList.copyOf(builder.codecs);
     }
 
-    public SupportedCodecs(List<Codec> codecs) {
+    public SupportedCodecs(List<Integer> codecs) {
         this.codecs = codecs;
     }
 
-    public List<Codec> getCodecs() {
+    public List<Integer> getCodecs() {
         return codecs;
     }
 
@@ -31,14 +31,14 @@ public static Builder newBuilder() {
      * BUILDER
      */
     public static class Builder {
-        private List<Codec> codecs = new ArrayList<>();
+        private List<Integer> codecs = new ArrayList<>();
 
-        public Builder addCodec(Codec codec) {
+        public Builder addCodec(int codec) {
             codecs.add(codec);
             return this;
         }
 
-        public Builder setCodecs(List<Codec> supportedCodecs) {
+        public Builder setCodecs(List<Integer> supportedCodecs) {
             this.codecs = supportedCodecs;
             return this;
         }

topic/src/main/java/tech/ydb/topic/impl/GzipCodec.java

@@ -0,0 +1,43 @@
+package tech.ydb.topic.impl;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+import tech.ydb.topic.description.Codec;
+
+/**
+ * Compression codec which implements the GZIP algorithm
+ */
+public class GzipCodec implements Codec {
+
+    private static final GzipCodec INSTANCE = new GzipCodec();
+
+    private GzipCodec() {
+    }
+
+    /**
+     * Get single instance
+     * @return single instance of RawCodec
+     */
+    public static GzipCodec getInstance() {
+        return INSTANCE;
+    }
+
+    @Override
+    public int getId() {
+        return Codec.GZIP;
+    }
+
+    @Override
+    public InputStream decode(InputStream byteArrayInputStream) throws IOException {
+        return new GZIPInputStream(byteArrayInputStream);
+    }
+
+    @Override
+    public OutputStream encode(OutputStream byteArrayOutputStream) throws IOException {
+        return new GZIPOutputStream(byteArrayOutputStream);
+    }
+}

topic/src/main/java/tech/ydb/topic/impl/LzopCodec.java

@@ -0,0 +1,48 @@
+package tech.ydb.topic.impl;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import org.anarres.lzo.LzoAlgorithm;
+import org.anarres.lzo.LzoCompressor;
+import org.anarres.lzo.LzoLibrary;
+import org.anarres.lzo.LzopInputStream;
+import org.anarres.lzo.LzopOutputStream;
+
+import tech.ydb.topic.description.Codec;
+
+/**
+ * Compression codec which implements the LZO algorithm
+ */
+public class LzopCodec implements Codec {
+
+    private static final LzopCodec INSTANCE = new LzopCodec();
+
+    private LzopCodec() {
+    }
+
+    /**
+     * Get single instance
+     * @return single instance of RawCodec
+     */
+    public static LzopCodec getInstance() {
+        return INSTANCE;
+    }
+
+    @Override
+    public int getId() {
+        return Codec.LZOP;
+    }
+
+    @Override
+    public InputStream decode(InputStream byteArrayInputStream) throws IOException {
+        return new LzopInputStream(byteArrayInputStream);
+    }
+
+    @Override
+    public OutputStream encode(OutputStream byteArrayOutputStream)  throws IOException {
+        LzoCompressor lzoCompressor = LzoLibrary.getInstance().newCompressor(LzoAlgorithm.LZO1X, null);
+        return new LzopOutputStream(byteArrayOutputStream, lzoCompressor);
+    }
+}

topic/src/main/java/tech/ydb/topic/impl/RawCodec.java

@@ -0,0 +1,41 @@
+package tech.ydb.topic.impl;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import tech.ydb.topic.description.Codec;
+
+/**
+ * Default codec which don't do any encode and decode.
+ *
+ */
+public class RawCodec implements Codec {
+    private static final RawCodec INSTANCE = new RawCodec();
+
+    private RawCodec() {
+    }
+
+    /**
+     * Get single instance
+     * @return single instance of RawCodec
+     */
+    public static RawCodec getInstance() {
+        return INSTANCE;
+    }
+
+    @Override
+    public int getId() {
+        return Codec.RAW;
+    }
+
+    @Override
+    public InputStream decode(InputStream byteArrayInputStream) throws IOException {
+        return byteArrayInputStream;
+    }
+
+    @Override
+    public OutputStream encode(OutputStream byteArrayOutputStream) throws IOException {
+        return byteArrayOutputStream;
+    }
+}