co.cask.cdap.proto.codec.ScheduleSpecificationCodec.java Source code

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Here is the source code for co.cask.cdap.proto.codec.ScheduleSpecificationCodec.java

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/*
 * Copyright  2014-2015 Cask Data, Inc.
 *
 * 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 co.cask.cdap.proto.codec;

import co.cask.cdap.api.schedule.Schedule;
import co.cask.cdap.api.schedule.ScheduleSpecification;
import co.cask.cdap.api.schedule.Schedules;
import co.cask.cdap.api.workflow.ScheduleProgramInfo;
import co.cask.cdap.internal.schedule.StreamSizeSchedule;
import co.cask.cdap.internal.schedule.TimeSchedule;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonSerializationContext;

import java.lang.reflect.Type;
import java.util.Map;

/**
 *
 */
public class ScheduleSpecificationCodec extends AbstractSpecificationCodec<ScheduleSpecification> {

    /**
     * Schedule Type.
     */
    private enum ScheduleType {
        /**
         * Represents {@link TimeSchedule} objects.
         */
        TIME,

        /**
         * Represents {@link StreamSizeSchedule} objects.
         */
        STREAM;

        private static ScheduleType fromSchedule(Schedule schedule) {
            if (schedule instanceof StreamSizeSchedule) {
                return STREAM;
            } else if (schedule instanceof TimeSchedule) {
                return TIME;
            } else {
                throw new IllegalArgumentException("Unhandled type of schedule: " + schedule.getClass());
            }
        }
    }

    @SuppressWarnings("deprecation")
    @Override
    public JsonElement serialize(ScheduleSpecification src, Type typeOfSrc, JsonSerializationContext context) {
        JsonObject jsonObj = new JsonObject();

        ScheduleType scheduleType = ScheduleType.fromSchedule(src.getSchedule());
        if (scheduleType.equals(ScheduleType.TIME)) {
            jsonObj.add("scheduleType", context.serialize(ScheduleType.TIME, ScheduleType.class));
            jsonObj.add("schedule", context.serialize(src.getSchedule(), TimeSchedule.class));
        } else if (scheduleType.equals(ScheduleType.STREAM)) {
            jsonObj.add("scheduleType", context.serialize(ScheduleType.STREAM, ScheduleType.class));
            jsonObj.add("schedule", context.serialize(src.getSchedule(), StreamSizeSchedule.class));
        }

        jsonObj.add("program", context.serialize(src.getProgram(), ScheduleProgramInfo.class));
        jsonObj.add("properties", serializeMap(src.getProperties(), context, String.class));
        return jsonObj;
    }

    @Override
    public ScheduleSpecification deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
            throws JsonParseException {
        JsonObject jsonObj = json.getAsJsonObject();

        JsonElement scheduleTypeJson = jsonObj.get("scheduleType");
        ScheduleType scheduleType;
        if (scheduleTypeJson == null) {
            // For backwards compatibility with spec persisted with older versions than 2.8, we need these lines
            scheduleType = null;
        } else {
            scheduleType = context.deserialize(jsonObj.get("scheduleType"), ScheduleType.class);
        }

        Schedule schedule = null;
        if (scheduleType == null) {
            JsonObject scheduleObj = jsonObj.get("schedule").getAsJsonObject();
            String name = context.deserialize(scheduleObj.get("name"), String.class);
            String description = context.deserialize(scheduleObj.get("description"), String.class);
            String cronEntry = context.deserialize(scheduleObj.get("cronEntry"), String.class);
            schedule = Schedules.builder(name).setDescription(description).createTimeSchedule(cronEntry);
        } else {
            switch (scheduleType) {
            case TIME:
                schedule = context.deserialize(jsonObj.get("schedule"), TimeSchedule.class);
                break;
            case STREAM:
                schedule = context.deserialize(jsonObj.get("schedule"), StreamSizeSchedule.class);
                break;
            }
        }

        ScheduleProgramInfo program = context.deserialize(jsonObj.get("program"), ScheduleProgramInfo.class);
        Map<String, String> properties = deserializeMap(jsonObj.get("properties"), context, String.class);
        return new ScheduleSpecification(schedule, program, properties);
    }
}