Add boundedness to source reader context, so that we can control to stop this reader when produce data

pom.xml

@@ -174,6 +174,8 @@
         <skipIT>true</skipIT>
         <elasticsearch>7</elasticsearch>
         <slf4j.version>1.7.25</slf4j.version>
+        <guava.version>19.0</guava.version>
+        <auto-service.version>1.0.1</auto-service.version>
     </properties>
 
     <dependencyManagement>
@@ -607,20 +609,43 @@
                 <version>${scala.version}</version>
             </dependency>
 
-            <!-- logging -->
             <dependency>
-                <groupId>org.slf4j</groupId>
-                <artifactId>slf4j-api</artifactId>
-                <version>${slf4j.version}</version>
-            </dependency>
-            <dependency>
-                <groupId>org.slf4j</groupId>
-                <artifactId>slf4j-log4j12</artifactId>
-                <version>${slf4j.version}</version>
+                <groupId>com.google.guava</groupId>
+                <artifactId>guava</artifactId>
+                <version>${guava.version}</version>
             </dependency>
         </dependencies>
     </dependencyManagement>
 
+    <dependencies>
+        <dependency>
+            <groupId>com.google.auto.service</groupId>
+            <artifactId>auto-service</artifactId>
+            <version>${auto-service.version}</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${slf4j.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-log4j12</artifactId>
+            <version>${slf4j.version}</version>
+        </dependency>
+    </dependencies>
+
     <build>
 
         <finalName>${project.artifactId}-${project.version}-${scala.version}</finalName>

seatunnel-api/pom.xml

@@ -38,9 +38,5 @@
             <artifactId>seatunnel-common</artifactId>
             <version>${project.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-api</artifactId>
-        </dependency>
     </dependencies>
 </project>

seatunnel-api/src/main/java/org/apache/seatunnel/api/source/Boundedness.java

@@ -17,6 +17,10 @@
 
 package org.apache.seatunnel.api.source;
 
+/**
+ * Used to define the boundedness of a source. In batch mode, the source is {@link Boundedness#BOUNDED}.
+ * In streaming mode, the source is {@link  Boundedness#UNBOUNDED}.
+ */
 public enum Boundedness {
     /**
      * A BOUNDED stream is a stream with finite records.

seatunnel-api/src/main/java/org/apache/seatunnel/api/source/Collector.java

@@ -17,6 +17,11 @@
 
 package org.apache.seatunnel.api.source;
 
+/**
+ * A {@link Collector} is used to collect data from {@link SourceReader}.
+ *
+ * @param <T> data type.
+ */
 public interface Collector<T> {
 
     void collect(T record);

seatunnel-api/src/main/java/org/apache/seatunnel/api/source/SeaTunnelSource.java

@@ -27,6 +27,7 @@
  *
  * @param <T>      The type of records produced by the source.
  * @param <SplitT> The type of splits handled by the source.
+ * @param <StateT> The type of checkpoint states.
  */
 public interface SeaTunnelSource<T, SplitT extends SourceSplit, StateT> extends Serializable {
 
@@ -37,14 +38,48 @@ public interface SeaTunnelSource<T, SplitT extends SourceSplit, StateT> extends
      */
     Boundedness getBoundedness();
 
+    /**
+     * Create source reader, used to produce data.
+     *
+     * @param readerContext reader context.
+     * @return source reader.
+     * @throws Exception when create reader failed.
+     */
     SourceReader<T, SplitT> createReader(SourceReader.Context readerContext) throws Exception;
 
+    /**
+     * Create split serializer, use to serialize/deserialize split generated by {@link SourceSplitEnumerator}.
+     *
+     * @return split serializer.
+     */
     Serializer<SplitT> getSplitSerializer();
 
-    SourceSplitEnumerator<SplitT, StateT> createEnumerator(SourceSplitEnumerator.Context<SplitT> enumeratorContext) throws Exception;
+    /**
+     * Create source split enumerator, used to generate splits. This method will be called only once when start a source.
+     *
+     * @param enumeratorContext enumerator context.
+     * @return source split enumerator.
+     * @throws Exception when create enumerator failed.
+     */
+    SourceSplitEnumerator<SplitT, StateT> createEnumerator(SourceSplitEnumerator.Context<SplitT> enumeratorContext)
+        throws Exception;
 
-    SourceSplitEnumerator<SplitT, StateT> restoreEnumerator(SourceSplitEnumerator.Context<SplitT> enumeratorContext, StateT checkpointState) throws Exception;
+    /**
+     * Create source split enumerator, used to generate splits. This method will be called when restore from checkpoint.
+     *
+     * @param enumeratorContext enumerator context.
+     * @param checkpointState   checkpoint state.
+     * @return source split enumerator.
+     * @throws Exception when create enumerator failed.
+     */
+    SourceSplitEnumerator<SplitT, StateT> restoreEnumerator(SourceSplitEnumerator.Context<SplitT> enumeratorContext,
+                                                            StateT checkpointState) throws Exception;
 
+    /**
+     * Create enumerator state serializer, used to serialize/deserialize checkpoint state.
+     *
+     * @return enumerator state serializer.
+     */
     Serializer<StateT> getEnumeratorStateSerializer();
 
 }

seatunnel-api/src/main/java/org/apache/seatunnel/api/source/SourceEvent.java

@@ -20,7 +20,7 @@
 import java.io.Serializable;
 
 /**
- * An base class for the events passed between the SourceReaders and Enumerators.
+ * A base class for the events passed between the {@link SourceReader} and {@link SourceSplitEnumerator}.
  */
 public interface SourceEvent extends Serializable {
 }

seatunnel-api/src/main/java/org/apache/seatunnel/api/source/SourceReader.java

@@ -22,8 +22,17 @@
 import java.io.IOException;
 import java.util.List;
 
+/**
+ * The {@link SourceReader} is used to generate source record, and it will be running at worker.
+ *
+ * @param <T>      record type.
+ * @param <SplitT> source split type.
+ */
 public interface SourceReader<T, SplitT extends SourceSplit> extends AutoCloseable, CheckpointListener {
 
+    /**
+     * Open the source reader.
+     */
     void open();
 
     /**
@@ -33,10 +42,28 @@ public interface SourceReader<T, SplitT extends SourceSplit> extends AutoCloseab
     @Override
     void close() throws IOException;
 
+    /**
+     * Generate the next batch of records.
+     *
+     * @param output output collector.
+     * @throws Exception if error occurs.
+     */
     void pollNext(Collector<T> output) throws Exception;
 
+    /**
+     * Get the current split checkpoint state by checkpointId.
+     *
+     * @param checkpointId checkpoint Id.
+     * @return split checkpoint state.
+     * @throws Exception if error occurs.
+     */
     List<SplitT> snapshotState(long checkpointId) throws Exception;
 
+    /**
+     * Add the split checkpoint state to reader.
+     *
+     * @param splits split checkpoint state.
+     */
     void addSplits(List<SplitT> splits);
 
     /**
@@ -48,6 +75,11 @@ public interface SourceReader<T, SplitT extends SourceSplit> extends AutoCloseab
      */
     void handleNoMoreSplits();
 
+    /**
+     * Handle the source event form {@link SourceSplitEnumerator}.
+     *
+     * @param sourceEvent source event.
+     */
     default void handleSourceEvent(SourceEvent sourceEvent) {
     }
 
@@ -59,7 +91,12 @@ interface Context {
         int getIndexOfSubtask();
 
         /**
-         * Indicator that the input has reached the end of data.
+         * @return boundedness of this reader.
+         */
+        Boundedness getBoundedness();
+
+        /**
+         * Indicator that the input has reached the end of data. Then will cancel this reader.
          */
         void signalNoMoreElement();
 

seatunnel-api/src/main/java/org/apache/seatunnel/api/source/SourceSplitEnumerator.java

@@ -24,6 +24,12 @@
 import java.util.List;
 import java.util.Set;
 
+/**
+ * The {@link SourceSplitEnumerator} is responsible for enumerating the splits of a source. It will run at master.
+ *
+ * @param <SplitT>       source split type
+ * @param <StateT>source split state type
+ */
 public interface SourceSplitEnumerator<SplitT extends SourceSplit, StateT> extends AutoCloseable, CheckpointListener {
 
     void open();
@@ -52,6 +58,12 @@ public interface SourceSplitEnumerator<SplitT extends SourceSplit, StateT> exten
 
     StateT snapshotState(long checkpointId) throws Exception;
 
+    /**
+     * Handle the source event from {@link SourceReader}.
+     *
+     * @param subtaskId   The id of the subtask to which the source event from.
+     * @param sourceEvent source event.
+     */
     default void handleSourceEvent(int subtaskId, SourceEvent sourceEvent) {
     }
 

seatunnel-api/src/main/java/org/apache/seatunnel/api/state/State.java

@@ -17,5 +17,7 @@
 
 package org.apache.seatunnel.api.state;
 
-public interface State {
+import java.io.Serializable;
+
+public interface State extends Serializable {
 }

seatunnel-api/src/main/java/org/apache/seatunnel/api/table/factory/Factory.java

@@ -17,6 +17,9 @@
 
 package org.apache.seatunnel.api.table.factory;
 
+/**
+ * This is the SPI interface.
+ */
 public interface Factory {
 
     /**

seatunnel-api/src/main/java/org/apache/seatunnel/api/table/factory/TableSinkFactory.java

@@ -19,6 +19,15 @@
 
 import org.apache.seatunnel.api.table.connector.TableSink;
 
+/**
+ * This is an SPI interface, used to create {@link TableSink}. Each plugin need to have it own implementation.
+ * todo: now we have not use this interface, we directly use {@link org.apache.seatunnel.api.sink.SeaTunnelSink} as the SPI interface.
+ *
+ * @param <IN>                    row type
+ * @param <StateT>                state type
+ * @param <CommitInfoT>           commit info type
+ * @param <AggregatedCommitInfoT> aggregated commit info type
+ */
 public interface TableSinkFactory<IN, StateT, CommitInfoT, AggregatedCommitInfoT> extends Factory {
 
     TableSink<IN, StateT, CommitInfoT, AggregatedCommitInfoT> createSink(TableFactoryContext context);

seatunnel-api/src/main/java/org/apache/seatunnel/api/table/factory/TableSourceFactory.java

@@ -20,6 +20,10 @@
 import org.apache.seatunnel.api.source.SourceSplit;
 import org.apache.seatunnel.api.table.connector.TableSource;
 
+/**
+ * This is an SPI interface, used to create {@link TableSource}. Each plugin need to have it own implementation.
+ * todo: now we have not use this interface, we directly use {@link org.apache.seatunnel.api.source.SeaTunnelSource} as the SPI interface
+ */
 public interface TableSourceFactory extends Factory {
 
     <T, SplitT extends SourceSplit, StateT> TableSource<T, SplitT, StateT> createSource(TableFactoryContext context);

seatunnel-common/src/main/java/org/apache/seatunnel/common/utils/SerializationUtils.java

@@ -26,24 +26,24 @@ public class SerializationUtils {
 
     public static String objectToString(Serializable obj) {
         if (obj != null) {
-            return Base64.encodeBase64String(org.apache.commons.lang3.SerializationUtils.serialize(obj));
+            return Base64.encodeBase64String(SerializationUtils.serialize(obj));
         }
         return null;
     }
 
     public static <T extends Serializable> T stringToObject(String str) {
         if (StringUtils.isNotEmpty(str)) {
-            return org.apache.commons.lang3.SerializationUtils.deserialize(Base64.decodeBase64(str));
+            return SerializationUtils.deserialize(Base64.decodeBase64(str));
         }
         return null;
     }
 
     public static <T extends Serializable> byte[] serialize(T obj) {
-        return org.apache.commons.lang3.SerializationUtils.serialize(obj);
+        return SerializationUtils.serialize(obj);
     }
 
     public static <T extends Serializable> T deserialize(byte[] bytes) {
-        return org.apache.commons.lang3.SerializationUtils.deserialize(bytes);
+        return SerializationUtils.deserialize(bytes);
     }
 
 }

seatunnel-connectors/seatunnel-connectors-seatunnel/seatunnel-connectors-seatunnel-console/src/main/java/org/apache/seatunnel/connectors/seatunnel/console/sink/ConsoleSink.java

@@ -22,8 +22,11 @@
 import org.apache.seatunnel.api.table.type.SeaTunnelRow;
 import org.apache.seatunnel.connectors.seatunnel.console.state.ConsoleState;
 
+import com.google.auto.service.AutoService;
+
 import java.util.List;
 
+@AutoService(SeaTunnelSink.class)
 public class ConsoleSink implements SeaTunnelSink<SeaTunnelRow, ConsoleState, ConsoleCommitInfo, ConsoleAggregatedCommitInfo> {
 
     @Override