HBASE-24119 Polish the protobuf usage in hbase-examples (#1438)

Move the proto files only used by hbase-examples to hbase-examples, to show users how to make use of shaded hbase protos when implementing coprocessor.

Signed-off-by: Jan Hentschel <jan.hentschel@ultratendency.com>
Signed-off-by: Viraj Jasani <vjasani@apache.org>

hbase-examples/pom.xml

@@ -29,7 +29,12 @@
   <artifactId>hbase-examples</artifactId>
   <name>Apache HBase - Examples</name>
   <description>Examples of HBase usage</description>
-  <!--REMOVE-->
+  <properties>
+    <!--Version of protobuf that hbase uses internally (we shade our pb)
+         Must match what is out in hbase-thirdparty include.
+    -->
+    <internal.protobuf.version>3.11.4</internal.protobuf.version>
+  </properties>
   <build>
     <plugins>
       <plugin>
@@ -62,9 +67,50 @@
             <goals>
               <goal>compile</goal>
             </goals>
+            <configuration>
+              <protocArtifact>com.google.protobuf:protoc:${internal.protobuf.version}:exe:${os.detected.classifier}</protocArtifact>
+              <checkStaleness>true</checkStaleness>
+            </configuration>
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>com.google.code.maven-replacer-plugin</groupId>
+        <artifactId>replacer</artifactId>
+        <version>1.5.3</version>
+        <executions>
+          <execution>
+            <phase>process-sources</phase>
+            <goals>
+              <goal>replace</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <basedir>${basedir}/target/generated-sources/</basedir>
+            <includes>
+              <include>**/*.java</include>
+            </includes>
+            <!-- Ignore errors when missing files, because it means this build
+                 was run with -Dprotoc.skip and there is no -Dreplacer.skip -->
+            <ignoreErrors>true</ignoreErrors>
+            <replacements>
+              <replacement>
+                <token>([^\.])com.google.protobuf</token>
+                <value>$1org.apache.hbase.thirdparty.com.google.protobuf</value>
+              </replacement>
+              <replacement>
+                <token>(public)(\W+static)?(\W+final)?(\W+class)</token>
+                <value>@javax.annotation.Generated("proto") $1$2$3$4</value>
+              </replacement>
+              <!-- replacer doesn't support anchoring or negative lookbehind -->
+              <replacement>
+                <token>(@javax.annotation.Generated\("proto"\) ){2}</token>
+                <value>$1</value>
+              </replacement>
+            </replacements>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>net.revelc.code</groupId>
         <artifactId>warbucks-maven-plugin</artifactId>
@@ -87,6 +133,10 @@
       <groupId>org.apache.hbase.thirdparty</groupId>
       <artifactId>hbase-shaded-netty</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.apache.hbase</groupId>
+      <artifactId>hbase-protocol-shaded</artifactId>
+    </dependency>
     <dependency>
       <groupId>org.apache.hbase</groupId>
       <artifactId>hbase-common</artifactId>

hbase-examples/src/main/java/org/apache/hadoop/hbase/types/PBCell.java

@@ -17,13 +17,14 @@
  */
 package org.apache.hadoop.hbase.types;
 
-import com.google.protobuf.CodedInputStream;
-import com.google.protobuf.CodedOutputStream;
 import java.io.IOException;
 import org.apache.hadoop.hbase.example.protobuf.generated.CellMessage;
 import org.apache.hadoop.hbase.util.PositionedByteRange;
 import org.apache.yetus.audience.InterfaceAudience;
 
+import org.apache.hbase.thirdparty.com.google.protobuf.CodedInputStream;
+import org.apache.hbase.thirdparty.com.google.protobuf.CodedOutputStream;
+
 /**
  * An example for using protobuf objects with {@link DataType} API.
  */

hbase-examples/src/main/java/org/apache/hadoop/hbase/types/PBType.java

@@ -17,15 +17,19 @@
  */
 package org.apache.hadoop.hbase.types;
 
-import com.google.protobuf.CodedInputStream;
-import com.google.protobuf.CodedOutputStream;
-import com.google.protobuf.Message;
 import org.apache.hadoop.hbase.util.Order;
 import org.apache.hadoop.hbase.util.PositionedByteRange;
 import org.apache.yetus.audience.InterfaceAudience;
 
+import org.apache.hbase.thirdparty.com.google.protobuf.CodedInputStream;
+import org.apache.hbase.thirdparty.com.google.protobuf.CodedOutputStream;
+import org.apache.hbase.thirdparty.com.google.protobuf.Message;
+
 /**
  * A base-class for {@link DataType} implementations backed by protobuf. See {@link PBCell}.
+ * <p/>
+ * Notice that, in hbase we always uses our own shaded version of protobuf, but you are free to use
+ * the original version of protobuf in your own project.
  */
 @InterfaceAudience.Private
 public abstract class PBType<T extends Message> implements DataType<T> {
@@ -59,6 +63,7 @@ public abstract class PBType<T extends Message> implements DataType<T> {
    * {@code src}'s position after consuming from the stream.
    * <p/>
    * For example:
+   *
    * <pre>
    * Foo.Builder builder = ...
    * CodedInputStream is = inputStreamFromByteRange(src);
@@ -76,6 +81,7 @@ public abstract class PBType<T extends Message> implements DataType<T> {
    * {@code dst}'s position after writing to the stream.
    * <p/>
    * For example:
+   *
    * <pre>
    * CodedOutputStream os = outputStreamFromByteRange(dst);
    * int before = os.spaceLeft(), after, written;

hbase-examples/src/test/java/org/apache/hadoop/hbase/types/TestPBCell.java

@@ -19,7 +19,6 @@ package org.apache.hadoop.hbase.types;
 
 import static org.junit.Assert.assertEquals;
 
-import com.google.protobuf.ByteString;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.example.protobuf.generated.CellMessage;
 import org.apache.hadoop.hbase.testclassification.MiscTests;
@@ -30,6 +29,8 @@ import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 
+import org.apache.hbase.thirdparty.com.google.protobuf.ByteString;
+
 @Category({ SmallTests.class, MiscTests.class })
 public class TestPBCell {
 

hbase-protocol-shaded/pom.xml

@@ -33,20 +33,10 @@
     <maven.javadoc.skip>true</maven.javadoc.skip>
     <!--Version of protobuf that hbase uses internally (we shade our pb)
          Must match what is out in hbase-thirdparty include.
-         3.5.1-1 is the same as 3.5.1 except includes corrected binaries for el6
-         to work around https://github.com/google/protobuf/issues/4109
-           -->
-    <internal.protobuf.version>3.5.1-1</internal.protobuf.version>
+    -->
+    <internal.protobuf.version>3.11.4</internal.protobuf.version>
   </properties>
   <build>
-    <resources>
-      <resource>
-        <directory>src/main/</directory>
-        <includes>
-          <include>**/*.proto</include>
-        </includes>
-      </resource>
-    </resources>
     <plugins>
       <!-- Make a jar and put the sources in the jar -->
       <plugin>
@@ -88,7 +78,6 @@
             </goals>
             <configuration>
               <protocArtifact>com.google.protobuf:protoc:${internal.protobuf.version}:exe:${os.detected.classifier}</protocArtifact>
-              <attachProtoSources>false</attachProtoSources>
               <checkStaleness>true</checkStaleness>
             </configuration>
           </execution>