有没有人在Flink中有一个通用ProcessFunction的例子？

import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

public class GenericProcessFunction extends KeyedProcessFunction<KeyType, InputType, OutputType> {

    private ValueState<StateType> state;

    @Override
    public void open(Configuration parameters) throws Exception {
        // 初始化状态
        ValueStateDescriptor<StateType> stateDescriptor = new ValueStateDescriptor<>("state", StateType.class);
        state = getRuntimeContext().getState(stateDescriptor);
    }

    @Override
    public void processElement(InputType input, Context context, Collector<OutputType> collector) throws Exception {
        // 获取当前键和时间戳
        KeyType key = context.getCurrentKey();
        Long timestamp = context.timestamp();

        // 获取或更新状态
        StateType currentState = state.value();
        // ...

        // 输出结果
        OutputType output = new OutputType();
        // ...
        collector.collect(output);

        // 注册定时器
        long timerTimestamp = timestamp + 60000; // 60秒后触发定时器
        context.timerService().registerEventTimeTimer(timerTimestamp);
    }

    @Override
    public void onTimer(long timestamp, OnTimerContext context, Collector<OutputType> collector) throws Exception {
        // 定时器触发时执行的逻辑
        // ...
    }
}