github.com/pingcap/ticdc@v0.0.0-20220526033649-485a10ef2652/demo/java/README.md (about)

     1  # How to use
     2  
     3  The following code shows how to parse ticdc data([ticdc open protocol](https://docs.pingcap.com/tidb/stable/ticdc-open-protocol)) which consumed from kafka.
     4  
     5  ```
     6  TicdcEventFilter filter = new TicdcEventFilter();
     7  for (KafkaMessage kafkaMessage : kafkaMessages) {
     8      TicdcEventDecoder ticdcEventDecoder = new TicdcEventDecoder(kafkaMessage);
     9      while (ticdcEventDecoder.hasNext()) {
    10          TicdcEventData data = ticdcEventDecoder.next();
    11          if (data.getTicdcEventValue() instanceof TicdcEventRowChange) {
    12              boolean ok = filter.check(data.getTicdcEventKey().getTbl(), data.getTicdcEventValue().getKafkaPartition(), data.getTicdcEventKey().getTs());
    13              if (ok) {
    14                  // deal with row change event
    15              } else {
    16                  // ignore duplicated messages
    17              }
    18          } else if (data.getTicdcEventValue() instanceof TicdcEventDDL) {
    19              // deal with ddl event
    20          } else if (data.getTicdcEventValue() instanceof TicdcEventResolve) {
    21              filter.resolveEvent(data.getTicdcEventValue().getKafkaPartition(), data.getTicdcEventKey().getTs());
    22              // deal with resolve event
    23          }
    24          System.out.println(JSON.toJSONString(data, true));
    25      }
    26  }
    27  
    28  ```
    29  [See com.pingcap.ticdc.cdc.TicdcEventDecoderTest.](src/test/java/com/pingcap/ticdc/cdc/TicdcEventDecoderTest.java).
    30  
    31  # How to install
    32  Prerequisites for building:
    33  
    34  * Git
    35  * Maven (we recommend version 3.2.5)
    36  * Java 8
    37  
    38  ```
    39  git clone git@github.com:pingcap/ticdc.git
    40  cd ticdc/demo/java
    41  mvn install
    42  ```
    43  
    44  Now ticdc-decoder is installed. To add a dependency :
    45  
    46  ```xml
    47  <dependency>
    48      <groupId>com.pingcap.ticdc.cdc</groupId>
    49      <artifactId>ticdc-decoder</artifactId>
    50      <version>4.0.6-SNAPSHOT</version>
    51  </dependency>
    52  ```