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

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

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/*
 * Copyright  2014 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.Resources;
import co.cask.cdap.api.spark.SparkSpecification;
import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;

import java.lang.reflect.Type;
import java.util.Map;
import javax.annotation.Nullable;

/**
 *
 */
public final class SparkSpecificationCodec extends AbstractSpecificationCodec<SparkSpecification> {

    @Override
    public JsonElement serialize(SparkSpecification src, Type typeOfSrc, JsonSerializationContext context) {
        JsonObject jsonObj = new JsonObject();

        jsonObj.add("className", new JsonPrimitive(src.getClassName()));
        jsonObj.add("name", new JsonPrimitive(src.getName()));
        jsonObj.add("description", new JsonPrimitive(src.getDescription()));
        jsonObj.add("mainClassName", new JsonPrimitive(src.getMainClassName()));
        jsonObj.add("properties", serializeMap(src.getProperties(), context, String.class));

        if (src.getDriverResources() != null) {
            jsonObj.add("driverResources", context.serialize(src.getDriverResources()));
        }
        if (src.getExecutorResources() != null) {
            jsonObj.add("executorResources", context.serialize(src.getExecutorResources()));
        }

        return jsonObj;
    }

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

        String className = jsonObj.get("className").getAsString();
        String name = jsonObj.get("name").getAsString();
        String description = jsonObj.get("description").getAsString();
        String mainClassName = jsonObj.get("mainClassName").getAsString();
        Map<String, String> properties = deserializeMap(jsonObj.get("properties"), context, String.class);

        Resources driverResources = deserializeResources(jsonObj, "driver", context);
        Resources executorResources = deserializeResources(jsonObj, "executor", context);

        return new SparkSpecification(className, name, description, mainClassName, properties, driverResources,
                executorResources);
    }

    /**
     * Deserialize {@link Resources} object from a json property named with {@code <prefix>Resources}.
     * A {@code null} value will be returned if no such property exist.
     */
    @Nullable
    private Resources deserializeResources(JsonObject jsonObj, String prefix, JsonDeserializationContext context) {
        String name = prefix + "Resources";
        JsonElement element = jsonObj.get(name);
        return element == null ? null : (Resources) context.deserialize(element, Resources.class);
    }
}