content: /*
   * 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 com.ververica.field.dynamicrules.functions;
  
  import com.ververica.field.dynamicrules.JsonMapper;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.flink.api.common.functions.RichFlatMapFunction;
  import org.apache.flink.configuration.Configuration;
  import org.apache.flink.util.Collector;
  
  @Slf4j
  public class JsonSerializer<T> extends RichFlatMapFunction<T, String> {
  
    private JsonMapper<T> parser;
    private final Class<T> targetClass;
  
    public JsonSerializer(Class<T> sourceClass) {
      this.targetClass = sourceClass;
    }
  
    @Override
    public void open(Configuration parameters) throws Exception {
      super.open(parameters);
      parser = new JsonMapper<>(targetClass);
    }
  
    @Override
    public void flatMap(T value, Collector<String> out) throws Exception {
      System.out.println(value);
      try {
        String serialized = parser.toString(value);
        out.collect(serialized);
      } catch (Exception e) {
        log.warn("Failed serializing to JSON dropping it:", e);
      }
    }
  }
  