com.flipkart.foxtrot.core.querystore.actions.spi.AnalyticsLoader.java Source code

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Here is the source code for com.flipkart.foxtrot.core.querystore.actions.spi.AnalyticsLoader.java

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/**
 * Copyright 2014 Flipkart Internet Pvt. Ltd.
 *
 * 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.flipkart.foxtrot.core.querystore.actions.spi;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.jsontype.NamedType;
import com.flipkart.foxtrot.common.ActionRequest;
import com.flipkart.foxtrot.core.cache.CacheManager;
import com.flipkart.foxtrot.core.common.Action;
import com.flipkart.foxtrot.core.datastore.DataStore;
import com.flipkart.foxtrot.core.querystore.QueryStore;
import com.flipkart.foxtrot.core.querystore.impl.ElasticsearchConnection;
import com.flipkart.foxtrot.core.table.TableMetadataManager;
import com.google.common.collect.Maps;
import com.yammer.dropwizard.lifecycle.Managed;
import org.reflections.Reflections;
import org.reflections.scanners.SubTypesScanner;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * User: Santanu Sinha (santanu.sinha@flipkart.com)
 * Date: 27/03/14
 * Time: 12:20 AM
 */

public class AnalyticsLoader implements Managed {

    private static final Logger logger = LoggerFactory.getLogger(AnalyticsLoader.class);

    private final Map<String, ActionMetadata> actions = Maps.newHashMap();
    private final TableMetadataManager tableMetadataManager;
    private final DataStore dataStore;
    private final QueryStore queryStore;
    private final ElasticsearchConnection elasticsearchConnection;
    private final CacheManager cacheManager;
    private final ObjectMapper objectMapper;

    public AnalyticsLoader(TableMetadataManager tableMetadataManager, DataStore dataStore, QueryStore queryStore,
            ElasticsearchConnection elasticsearchConnection, CacheManager cacheManager, ObjectMapper objectMapper) {
        this.tableMetadataManager = tableMetadataManager;
        this.dataStore = dataStore;
        this.queryStore = queryStore;
        this.elasticsearchConnection = elasticsearchConnection;
        this.cacheManager = cacheManager;
        this.objectMapper = objectMapper;
    }

    @SuppressWarnings("unchecked")
    public <R extends ActionRequest> Action<R> getAction(R request) throws Exception {
        final String className = request.getClass().getCanonicalName();
        if (actions.containsKey(className)) {
            ActionMetadata metadata = actions.get(className);
            if (metadata.getRequest().isInstance(request)) {
                R r = (R) metadata.getRequest().cast(request);
                Constructor<? extends Action> constructor = metadata.getAction().getConstructor(
                        metadata.getRequest(), TableMetadataManager.class, DataStore.class, QueryStore.class,
                        ElasticsearchConnection.class, String.class, CacheManager.class);
                return constructor.newInstance(r, tableMetadataManager, dataStore, queryStore,
                        elasticsearchConnection, metadata.getCacheToken(), cacheManager);
            }
        }
        return null;
    }

    public void register(ActionMetadata actionMetadata) {
        actions.put(actionMetadata.getRequest().getCanonicalName(), actionMetadata);
        if (actionMetadata.isCacheable()) {
            cacheManager.create(actionMetadata.getCacheToken());
        }
    }

    @Override
    public void start() throws Exception {
        Reflections reflections = new Reflections("com.flipkart.foxtrot", new SubTypesScanner());
        Set<Class<? extends Action>> actions = reflections.getSubTypesOf(Action.class);
        if (actions.isEmpty()) {
            throw new Exception("No analytics actions found!!");
        }
        List<NamedType> types = new ArrayList<>();
        for (Class<? extends Action> action : actions) {
            AnalyticsProvider analyticsProvider = action.getAnnotation(AnalyticsProvider.class);
            if (null == analyticsProvider.request() || null == analyticsProvider.opcode()
                    || analyticsProvider.opcode().isEmpty() || null == analyticsProvider.response()) {
                throw new Exception("Invalid annotation on " + action.getCanonicalName());
            }
            if (analyticsProvider.opcode().equalsIgnoreCase("default")) {
                logger.warn("Action " + action.getCanonicalName() + " does not specify cache token. "
                        + "Using default cache.");
            }
            register(new ActionMetadata(analyticsProvider.request(), action, analyticsProvider.cacheable(),
                    analyticsProvider.opcode()));
            types.add(new NamedType(analyticsProvider.request(), analyticsProvider.opcode()));
            types.add(new NamedType(analyticsProvider.response(), analyticsProvider.opcode()));
            logger.info("Registered action: " + action.getCanonicalName());
        }
        objectMapper.getSubtypeResolver().registerSubtypes(types.toArray(new NamedType[types.size()]));
    }

    @Override
    public void stop() throws Exception {

    }
}