[GitHub] [ignite] gvvinblade commented on a change in pull request #8307: IGNITE-13515 Performance drop when there are many thin clients per server

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gvvinblade commented on a change in pull request #8307:
URL: https://github.com/apache/ignite/pull/8307#discussion_r499528638



##########
File path: modules/core/src/main/java/org/apache/ignite/internal/processors/odbc/ClientMessage.java
##########
@@ -0,0 +1,189 @@
+/*
+ * 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.apache.ignite.internal.processors.odbc;
+
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.nio.ByteBuffer;
+import org.apache.ignite.internal.IgniteCodeGeneratingFail;
+import org.apache.ignite.internal.binary.streams.BinaryHeapOutputStream;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.apache.ignite.plugin.extensions.communication.Message;
+import org.apache.ignite.plugin.extensions.communication.MessageReader;
+import org.apache.ignite.plugin.extensions.communication.MessageWriter;
+
+@IgniteCodeGeneratingFail
+public class ClientMessage implements Message, Externalizable {
+    /** */
+    private static final long serialVersionUID = -4609408156037304495L;
+
+    /** */
+    private byte[] data;
+
+    /** */
+    private BinaryHeapOutputStream stream;
+
+    /** */
+    private int cnt = -4;
+
+    /** */
+    private int msgSize;
+
+    /** */
+    public ClientMessage() {}
+
+    /** */
+    public ClientMessage(byte[] data) {
+        this.data = data;
+    }
+
+    /** */
+    public ClientMessage(BinaryHeapOutputStream stream) {
+        this.stream = stream;
+    }
+
+    /** {@inheritDoc} */
+    @Override public boolean writeTo(ByteBuffer buf, MessageWriter ignored) {
+        assert stream != null || data != null;
+
+        byte[] data = stream != null ? stream.array() : this.data;
+        int msgSize = stream != null ? stream.position() : data.length;
+
+        if (cnt < 0) {
+            for (; cnt < 0 && buf.hasRemaining(); cnt++)
+                buf.put((byte) ((msgSize >> (8 * (4 + cnt))) & 0xFF));

Review comment:
       The code was borrowed from `ClientListenerNioServerBuffer` without changes. Yes, it can be rewritten using buf.putInt()/buf.getInt() checking there are enough bytes to perform the operation. But the same operations will be invoked under the hood. I don't thing we'll get any advantages this way, but we won't be able to read int partially instead. In other words there is no benefits to rewrite the code instead of just to borrow what we already have.




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