[Fix-818][connector] fix when the data is flushed with an exception and no new...

[Fix-818][connector] fix when the data is flushed with an exception and no new data is entered subsequently (#824)

Co-authored-by: lucas.wu <1220671715>

dlink-connectors/dlink-connector-doris-1.13/src/main/java/org/apache/doris/flink/cfg/GenericDorisSinkFunction.java

+package org.apache.doris.flink.cfg;
+import org.apache.doris.flink.table.DorisDynamicOutputFormat;
+import org.apache.flink.api.common.functions.RuntimeContext;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.runtime.state.FunctionInitializationContext;
+import org.apache.flink.runtime.state.FunctionSnapshotContext;
+import org.apache.flink.streaming.api.checkpoint.CheckpointedFunction;
+import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
+import org.apache.flink.util.Preconditions;
+
+import javax.annotation.Nonnull;
+
+public class GenericDorisSinkFunction<T> extends RichSinkFunction<T>
+        implements CheckpointedFunction {
+
+    private static final long serialVersionUID = 1L;
+    private final DorisDynamicOutputFormat outputFormat;
+
+    public GenericDorisSinkFunction(@Nonnull DorisDynamicOutputFormat outputFormat) {
+        this.outputFormat = Preconditions.checkNotNull(outputFormat);
+    }
+
+    @Override
+    public void open(Configuration parameters) throws Exception {
+        super.open(parameters);
+        RuntimeContext ctx = getRuntimeContext();
+        outputFormat.setRuntimeContext(ctx);
+        outputFormat.open(ctx.getIndexOfThisSubtask(), ctx.getNumberOfParallelSubtasks());
+    }
+
+
+    @Override
+    public void invoke(T value, Context context) throws Exception {
+        outputFormat.writeRecord(value);
+    }
+
+    @Override
+    public void initializeState(FunctionInitializationContext context) throws Exception {
+    }
+
+    @Override
+    public void snapshotState(FunctionSnapshotContext context) throws Exception {
+        outputFormat.flush();
+    }
+
+    @Override
+    public void close() throws Exception {
+        outputFormat.close();
+        super.close();
+    }
+
+}