com.ibm.watson.app.common.services.impl.BluemixServicesConfigurationParser.java Source code

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Here is the source code for com.ibm.watson.app.common.services.impl.BluemixServicesConfigurationParser.java

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/* Copyright IBM Corp. 2015
 *
 * 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.ibm.watson.app.common.services.impl;

import java.lang.reflect.InvocationTargetException;
import java.util.Map.Entry;
import java.util.Objects;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonParser;
import com.google.gson.JsonSyntaxException;
import com.ibm.watson.app.common.services.BluemixConfiguredService;
import com.ibm.watson.app.common.util.rest.MessageKey;

public class BluemixServicesConfigurationParser {
    private static final Logger logger = LogManager.getLogger();

    private final Gson gson = new GsonBuilder().setVersion(1.0).create();

    public void parseAndRegisterServices(String jsonString) {
        Objects.requireNonNull(jsonString,
                MessageKey.AQWEGA14018E_json_string_null.getMessage().getFormattedMessage());

        if (logger.isDebugEnabled()) {
            logger.debug("Parsing JSON string: " + jsonString);
        }

        final JsonParser parser = new JsonParser();
        try {
            parseAndRegisterServices(parser.parse(jsonString));
        } catch (JsonSyntaxException e) {
            logger.error(MessageKey.AQWEGA14000E_error_parsing_json_string_1.getMessage(jsonString));
            logger.catching(e);
        }
    }

    public void parseAndRegisterServices(JsonElement json) {
        Objects.requireNonNull(json, MessageKey.AQWEGA14019E_json_element_null.getMessage().getFormattedMessage());
        if (!json.isJsonObject()) {
            throw new JsonParseException(MessageKey.AQWEGA14001E_expected_json_object_parse_bluemix_service_conf
                    .getMessage().getFormattedMessage());
        }

        final boolean isTrace = logger.isTraceEnabled();

        for (Entry<String, JsonElement> entry : json.getAsJsonObject().entrySet()) {
            final String serviceKey = entry.getKey();
            final JsonElement serviceConfigArray = entry.getValue();
            if (!serviceConfigArray.isJsonArray()) {
                throw new JsonParseException(MessageKey.AQWEGA14002E_expected_json_array_while_parsing_config_1
                        .getMessage(serviceKey).getFormattedMessage());
            }

            BluemixServiceInfo<? extends BluemixConfiguredService> service = BluemixServicesBinder
                    .getBluemixServiceByName(serviceKey);
            if (service == null) {
                logger.warn(MessageKey.AQWEGA12001W_unexpected_conf_supplied_for_service_ignore_1
                        .getMessage(serviceKey));
                continue;
            }

            if (isTrace) {
                logger.trace("Loading configuration for service '" + serviceKey + "'");
            }

            for (JsonElement serviceInstanceConfig : serviceConfigArray.getAsJsonArray()) {
                try {
                    BluemixConfiguredService serviceImpl = service.serviceImpl.getConstructor().newInstance();
                    serviceImpl
                            .setConfig(gson.fromJson(serviceInstanceConfig, serviceImpl.getConfigurationClass()));
                    serviceImpl.initialize();
                    register(service, serviceImpl);
                } catch (IllegalAccessException | InstantiationException | IllegalArgumentException
                        | InvocationTargetException | NoSuchMethodException | SecurityException e) {
                    logger.warn(MessageKey.AQWEGA12002W_unable_register_service_error_2.getMessage(serviceKey,
                            e.getMessage()));
                    logger.catching(Level.DEBUG, e);
                }
            }
        }
    }

    protected void register(BluemixServiceInfo<? extends BluemixConfiguredService> service,
            BluemixConfiguredService serviceImpl) {
        BluemixServicesBinder.registerBluemixService(service.iface, serviceImpl);
    }
}