com.github.kagkarlsson.scheduler.serializer.GsonSerializer Maven / Gradle / Ivy

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Simple persistent scheduler for scheduled tasks, recurring or ad-hoc.

There is a newer version: 15.0.0

/**
 * Copyright (C) Gustav Karlsson
 *
 * Licensed 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.github.kagkarlsson.scheduler.serializer;

import com.github.kagkarlsson.scheduler.serializer.gson.*;
import com.github.kagkarlsson.scheduler.task.schedule.CronSchedule;
import com.github.kagkarlsson.scheduler.task.schedule.Daily;
import com.github.kagkarlsson.scheduler.task.schedule.FixedDelay;
import com.github.kagkarlsson.scheduler.task.schedule.Schedule;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.time.Duration;
import java.time.Instant;
import java.time.LocalTime;
import java.time.ZoneId;
import java.util.function.Consumer;

public class GsonSerializer implements Serializer {
    public static final Charset CHARSET = StandardCharsets.UTF_8;
    private final Gson gson;

    public static GsonBuilder getDefaultGson() {
        RuntimeTypeAdapterFactory runtimeTypeAdapterFactory = RuntimeTypeAdapterFactory
            .of(Schedule.class, "type")
            .registerSubtype(CronSchedule.class, "cron")
            .registerSubtype(FixedDelay.class, "fixedDelay")
            .registerSubtype(Daily.class, "daily");

        return new GsonBuilder()
            .serializeNulls()
            .registerTypeAdapter(Instant.class, new InstantAdapter())
            .registerTypeAdapter(Duration.class, new DurationAdapter())
            .registerTypeAdapter(LocalTime.class, new LocalTimeAdapter())
            .registerTypeHierarchyAdapter(ZoneId.class, new ZoneIdAdapter())
            .registerTypeAdapterFactory(runtimeTypeAdapterFactory);
    }

    public GsonSerializer() {
        this(getDefaultGson().create());
    }

    public GsonSerializer(Gson gson) {
        this.gson = gson;
    }

    public GsonSerializer(Consumer gsonCustomizer) {
        GsonBuilder defaultGson = getDefaultGson();
        gsonCustomizer.accept(defaultGson);
        this.gson = defaultGson.create();
    }

    @Override
    public byte[] serialize(Object object) {
        return gson.toJson(object).getBytes(CHARSET);
    }

    @Override
    public  T deserialize(Class clazz, byte[] serializedData) {
        return gson.fromJson(new String(serializedData, CHARSET), clazz);
    }

}