io.github.aneudeveloper.func.engine.function.FuncEventDeserializer Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of func-engine Show documentation
Func engine for java, which creates kafka messages as workflow.
There is a newer version: 1.2.3
/**
* Copyright 2022 aneuDeveloper
* 
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
* 
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
* 
*/
package io.github.aneudeveloper.func.engine.function;

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;

import org.apache.kafka.common.serialization.Deserializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.github.aneudeveloper.func.engine.function.FuncEvent.Type;

public class FuncEventDeserializer implements Deserializer> {
    private static final Logger LOGGER = LoggerFactory.getLogger(FuncEventDeserializer.class);
    public static final String VERSION = "1";
    private FuncContextSerDes serDes;

    public FuncEventDeserializer(FuncContextSerDes serDes) {
        this.serDes = serDes;
    }

    public FuncEvent deserialize(String topic, byte[] data) {
        String dataAsString = new String(data);
        FuncEvent functionEvent = this.deserialize(dataAsString);
        return functionEvent;
    }

    public FuncEvent deserialize(String messageAsString) {
        int indexOfEnd = messageAsString.indexOf("$e%,");
        String metadata = messageAsString.substring(0, indexOfEnd);

        FuncEvent functionEvent = new FuncEvent<>(VERSION);
        this.populateVariables(functionEvent, metadata);

        String clientData = messageAsString.substring(indexOfEnd + 4, messageAsString.length());
        if (functionEvent.getType() != null && functionEvent.getType() == Type.ERROR) {
            Exception exception = new Exception(clientData);
            functionEvent.setError(exception);
            return functionEvent;
        }
        functionEvent.setContext(serDes.deserialize(clientData));
        return functionEvent;
    }

    private void populateVariables(FuncEvent functionEvent, String metadata) {
        for (String variable : metadata.split(",")) {
            String[] keyValuePair = variable.split("=");
            if (keyValuePair.length <= 1) {
                continue;
            }
            switch (keyValuePair[0]) {
                case "v": {
                    functionEvent.setVersion(keyValuePair[1]);
                    break;
                }
                case "id": {
                    functionEvent.setId(keyValuePair[1]);
                    break;
                }
                case "timestamp": {
                    functionEvent.setTimeStamp(this.parseDateFromMillis(keyValuePair[1]));
                    break;
                }
                case "processName": {
                    functionEvent.setProcessName(keyValuePair[1]);
                    break;
                }
                case "processInstanceID": {
                    functionEvent.setProcessInstanceID(keyValuePair[1]);
                    break;
                }
                case "comingFromId": {
                    functionEvent.setComingFromId(keyValuePair[1]);
                    break;
                }
                case "func": {
                    functionEvent.setFunction(keyValuePair[1]);
                    break;
                }
                case "func_type": {
                    try {
                        functionEvent.setType(FuncEvent.Type.valueOf(keyValuePair[1]));
                    } catch (Exception e) {
                        LOGGER.error("Unknown FunctionEvent.Type=" + keyValuePair[1]);
                    }
                    continue;
                }
                case "processStep": {
                    functionEvent.setFunction(keyValuePair[1]);
                    break;
                }
                case "retryCount": {
                    functionEvent.setRetryCount(Integer.parseInt(keyValuePair[1]));
                    break;
                }
                case "nextRetryAt": {
                    functionEvent.setNextRetryAt(this.parseDateFromMillis(keyValuePair[1]));
                    break;
                }
                case "sourceTopic": {
                    functionEvent.setSourceTopic(keyValuePair[1]);
                    break;
                }
            }
        }
    }

    private ZonedDateTime parseDateFromMillis(String millis) {
        try {
            long millisParsed = Long.parseLong(millis);
            ZonedDateTime dateTime = ZonedDateTime.ofInstant(Instant.ofEpochMilli(millisParsed),
                    ZoneId.systemDefault());
            return dateTime;
        } catch (NumberFormatException e) {
            LOGGER.error(e.getMessage(), e);
            return null;
        }
    }
}