[Fix apache#3721] Optimize event grouping

api/kogito-events-api/pom.xml

@@ -47,10 +47,6 @@
     </dependency>
 
     <!-- CloudEvents -->
-     <dependency>
-      <groupId>io.cloudevents</groupId>
-      <artifactId>cloudevents-core</artifactId>
-    </dependency>
     <!-- Tests -->
     <dependency>
       <groupId>org.junit.jupiter</groupId>
@@ -72,6 +68,10 @@
       <artifactId>slf4j-simple</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+    	<groupId>org.kie.kogito</groupId>
+    	<artifactId>kogito-jackson-utils</artifactId>
+    </dependency>
   </dependencies>
 
 </project>

api/kogito-events-api/src/main/java/org/kie/kogito/event/process/CloudEventVisitor.java

@@ -0,0 +1,25 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.kie.kogito.event.process;
+
+import org.kie.kogito.event.DataEvent;
+
+public interface CloudEventVisitor {
+    void visit(DataEvent<?> cloudEvent);
+}

api/kogito-events-api/src/main/java/org/kie/kogito/event/process/KogitoEventBodySerializationHelper.java

@@ -0,0 +1,297 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.kie.kogito.event.process;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.util.Collection;
+import java.util.Date;
+
+import org.kie.kogito.jackson.utils.ObjectMapperFactory;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+public class KogitoEventBodySerializationHelper {
+
+    private KogitoEventBodySerializationHelper() {
+    }
+
+    public static String readUTF(DataInput in) throws IOException {
+        boolean isNotNull = in.readBoolean();
+        return isNotNull ? in.readUTF() : null;
+    }
+
+    public static void writeUTF(DataOutput out, String string) throws IOException {
+        if (string == null) {
+            out.writeBoolean(false);
+        } else {
+            out.writeBoolean(true);
+            out.writeUTF(string);
+        }
+    }
+
+    public static void writeDate(DataOutput out, Date date) throws IOException {
+        if (date == null) {
+            out.writeBoolean(false);
+        } else {
+            out.writeBoolean(true);
+            out.writeLong(date.getTime());
+        }
+    }
+
+    public static Date readDate(DataInput in) throws IOException {
+        boolean isNotNull = in.readBoolean();
+        return isNotNull ? new Date(in.readLong()) : null;
+    }
+
+    public static void writeTime(DataOutput out, OffsetDateTime date) throws IOException {
+        if (date == null) {
+            out.writeBoolean(false);
+        } else {
+            out.writeBoolean(true);
+            out.writeLong(date.toInstant().toEpochMilli());
+        }
+    }
+
+    public static OffsetDateTime readTime(DataInput in) throws IOException {
+        boolean isNotNull = in.readBoolean();
+        return isNotNull ? Instant.ofEpochMilli(in.readLong()).atOffset(ZoneOffset.UTC) : null;
+    }
+
+    public static void writeUTFCollection(DataOutput out, Collection<String> collection) throws IOException {
+        if (collection == null) {
+            writeInt(out, -1);
+        } else {
+            writeInt(out, collection.size());
+            for (String item : collection) {
+                writeUTF(out, item);
+            }
+        }
+    }
+
+    public static <T extends Collection<String>> T readUTFCollection(DataInput in, T holder) throws IOException {
+        int size = readInt(in);
+        if (size == -1) {
+            return null;
+        }
+        while (size-- > 0) {
+            holder.add(readUTF(in));
+        }
+        return holder;
+    }
+
+    private enum SerType {
+
+        NULL(KogitoEventBodySerializationHelper::writeNull, KogitoEventBodySerializationHelper::readNull),
+        JSON(KogitoEventBodySerializationHelper::writeJson, KogitoEventBodySerializationHelper::readJson),
+        DEFAULT(KogitoEventBodySerializationHelper::writeJson, KogitoEventBodySerializationHelper::readDefault),
+        STRING(KogitoEventBodySerializationHelper::writeString, DataInput::readUTF),
+        INT(KogitoEventBodySerializationHelper::writeInt, DataInput::readInt),
+        SHORT(KogitoEventBodySerializationHelper::writeShort, DataInput::readShort),
+        LONG(KogitoEventBodySerializationHelper::writeLong, DataInput::readLong),
+        BYTE(KogitoEventBodySerializationHelper::writeByte, DataInput::readByte),
+        BOOLEAN(KogitoEventBodySerializationHelper::writeBoolean, DataInput::readBoolean),
+        FLOAT(KogitoEventBodySerializationHelper::writeFloat, DataInput::readFloat),
+        DOUBLE(KogitoEventBodySerializationHelper::writeDouble, DataInput::readDouble);
+
+        final ObjectWriter writer;
+        final ObjectReader reader;
+
+        SerType(ObjectWriter writer, ObjectReader reader) {
+            this.writer = writer;
+            this.reader = reader;
+        }
+
+        ObjectWriter writer() {
+            return writer;
+        }
+
+        ObjectReader reader() {
+            return reader;
+        }
+
+        static SerType fromType(Class<?> type) {
+            if (JsonNode.class.isAssignableFrom(type)) {
+                return JSON;
+            } else if (String.class.isAssignableFrom(type)) {
+                return STRING;
+            } else if (Boolean.class.isAssignableFrom(type)) {
+                return BOOLEAN;
+            } else if (Integer.class.isAssignableFrom(type)) {
+                return INT;
+            } else if (Short.class.isAssignableFrom(type)) {
+                return SHORT;
+            } else if (Byte.class.isAssignableFrom(type)) {
+                return BYTE;
+            } else if (Long.class.isAssignableFrom(type)) {
+                return LONG;
+            } else if (Float.class.isAssignableFrom(type)) {
+                return FLOAT;
+            } else if (Double.class.isAssignableFrom(type)) {
+                return DOUBLE;
+            } else {
+                return DEFAULT;
+            }
+        }
+
+        static SerType fromObject(Object obj) {
+            return obj == null ? NULL : fromType(obj.getClass());
+        }
+    }
+
+    private static void writeType(DataOutput out, SerType type) throws IOException {
+        out.writeByte(type.ordinal());
+    }
+
+    private static SerType readType(DataInput in) throws IOException {
+        return SerType.values()[in.readByte()];
+    }
+
+    public static void writeObject(DataOutput out, Object obj) throws IOException {
+        SerType type = SerType.fromObject(obj);
+        writeType(out, type);
+        type.writer().accept(out, obj);
+    }
+
+    public static Object readObject(DataInput in) throws IOException {
+        return readType(in).reader().apply(in);
+    }
+
+    @FunctionalInterface
+    private static interface ObjectWriter {
+        void accept(DataOutput out, Object obj) throws IOException;
+    }
+
+    private static interface ObjectReader {
+        Object apply(DataInput out) throws IOException;
+    }
+
+    private static void writeString(DataOutput out, Object obj) throws IOException {
+        out.writeUTF((String) obj);
+    }
+
+    private static void writeBoolean(DataOutput out, Object obj) throws IOException {
+        out.writeBoolean((Boolean) obj);
+    }
+
+    private static void writeInt(DataOutput out, Object obj) throws IOException {
+        out.writeInt((Integer) obj);
+    }
+
+    private static void writeLong(DataOutput out, Object obj) throws IOException {
+        out.writeInt((Integer) obj);
+    }
+
+    private static void writeShort(DataOutput out, Object obj) throws IOException {
+        out.writeShort((Short) obj);
+    }
+
+    private static void writeByte(DataOutput out, Object obj) throws IOException {
+        out.writeByte((Byte) obj);
+    }
+
+    private static void writeFloat(DataOutput out, Object obj) throws IOException {
+        out.writeFloat((Float) obj);
+    }
+
+    private static void writeDouble(DataOutput out, Object obj) throws IOException {
+        out.writeDouble((Double) obj);
+    }
+
+    private static void writeNull(DataOutput out, Object obj) {
+        // do nothing
+    }
+
+    private static Object readNull(DataInput in) {
+        return null;
+    }
+
+    public static void writeInteger(DataOutput out, Integer integer) throws IOException {
+        if (integer == null) {
+            writeType(out, SerType.NULL);
+        } else {
+            writeInt(out, integer.intValue());
+        }
+    }
+
+    public static Integer readInteger(DataInput in) throws IOException {
+        SerType type = readType(in);
+        return type == SerType.NULL ? null : readInt(in, type);
+
+    }
+
+    private static void writeInt(DataOutput out, int size) throws IOException {
+        if (size < Byte.MAX_VALUE) {
+            writeType(out, SerType.BYTE);
+            out.writeByte((byte) size);
+        } else if (size < Short.MAX_VALUE) {
+            writeType(out, SerType.SHORT);
+            out.writeShort((short) size);
+        } else {
+            writeType(out, SerType.INT);
+            out.writeInt(size);
+        }
+    }
+
+    private static int readInt(DataInput in) throws IOException {
+        SerType type = readType(in);
+        return readInt(in, type);
+    }
+
+    private static int readInt(DataInput in, SerType type) throws IOException {
+        switch (type) {
+            case INT:
+                return in.readInt();
+            case SHORT:
+                return in.readShort();
+            case BYTE:
+                return in.readByte();
+            default:
+                throw new IOException("Stream corrupted. Read unrecognized type " + type);
+        }
+    }
+
+    private static void writeJson(DataOutput out, Object obj) throws IOException {
+        byte[] bytes = ObjectMapperFactory.get().writeValueAsBytes(obj);
+        out.writeInt(bytes.length);
+        out.write(bytes);
+    }
+
+    private static Object readJson(DataInput in) throws IOException {
+        return readJson(in, JsonNode.class);
+    }
+
+    private static Object readDefault(DataInput in) throws IOException {
+        return readJson(in, Object.class);
+    }
+
+    private static Object readJson(DataInput in, Class<?> type) throws IOException {
+        byte[] bytes = new byte[in.readInt()];
+        in.readFully(bytes);
+        return ObjectMapperFactory.get().readValue(bytes, type);
+    }
+
+    public static Date toDate(OffsetDateTime time) {
+        return time == null ? null : Date.from(time.toInstant());
+    }
+}

api/kogito-events-api/src/main/java/org/kie/kogito/event/process/KogitoMarshallEventSupport.java

@@ -0,0 +1,30 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.kie.kogito.event.process;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+
+public interface KogitoMarshallEventSupport {
+
+    void writeEvent(DataOutput out) throws IOException;
+
+    void readEvent(DataInput in) throws IOException;
+}