com.iyonger.apm.web.service.RegionService.java Source code

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Here is the source code for com.iyonger.apm.web.service.RegionService.java

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/* 
 * 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.iyonger.apm.web.service;

import com.iyonger.apm.web.configuration.Config;
import com.iyonger.apm.web.configuration.constant.ClusterConstants;
import com.iyonger.apm.web.model.AgentManager;
import com.iyonger.apm.web.model.RegionInfo;
import com.iyonger.apm.web.util.TypeConvertUtils;
import com.google.common.collect.Maps;
import com.google.common.collect.Sets;
import net.grinder.common.processidentity.AgentIdentity;
import net.grinder.util.NetworkUtils;
import net.sf.ehcache.Ehcache;
import org.apache.commons.lang.StringUtils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.Cache;
import org.springframework.cache.Cache.ValueWrapper;
import org.springframework.cache.CacheManager;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;

import static org.ngrinder.common.util.ExceptionUtils.processException;

/**
 * Region service class. This class responsible to keep the status of available regions.
 *
 * @author Mavlarn
 * @author JunHo Yoon
 * @since 3.1
 */
@Service
public class RegionService {

    @SuppressWarnings("UnusedDeclaration")
    private static final Logger LOGGER = LoggerFactory.getLogger(RegionService.class);

    @Autowired
    private Config config;

    @Autowired
    private ScheduledTaskService scheduledTaskService;

    @Autowired
    private CacheManager cacheManager;
    private Cache cache;

    /**
     * Set current region into cache, using the IP as key and region name as value.
     */
    @PostConstruct
    public void initRegion() {
        if (config.isClustered()) {
            cache = cacheManager.getCache("regions");
            verifyDuplicatedRegion();
            scheduledTaskService.addFixedDelayedScheduledTask(new Runnable() {
                @Override
                public void run() {
                    checkRegionUpdate();
                }
            }, 3000);
        }
    }

    /**
     * Verify duplicate region when starting with cluster mode.
     *
     * @since 3.2
     */
    private void verifyDuplicatedRegion() {
        Map<String, RegionInfo> regions = getAll();
        String localRegion = getCurrent();
        RegionInfo regionInfo = regions.get(localRegion);
        if (regionInfo != null && !StringUtils.equals(regionInfo.getIp(), config.getClusterProperties()
                .getProperty(ClusterConstants.PROP_CLUSTER_HOST, NetworkUtils.DEFAULT_LOCAL_HOST_ADDRESS))) {
            throw processException("The region name, " + localRegion + ", is already used by other controller "
                    + regionInfo.getIp() + ". Please set the different region name in this controller.");
        }
    }

    @Autowired
    private AgentManager agentManager;

    /**
     * check Region and Update its value.
     */
    public void checkRegionUpdate() {
        if (!config.isInvisibleRegion()) {
            try {
                HashSet<AgentIdentity> newHashSet = Sets.newHashSet(agentManager.getAllAttachedAgents());
                final String regionIP = StringUtils.defaultIfBlank(config.getCurrentIP(),
                        NetworkUtils.DEFAULT_LOCAL_HOST_ADDRESS);
                cache.put(getCurrent(), new RegionInfo(regionIP, config.getControllerPort(), newHashSet));
            } catch (Exception e) {
                LOGGER.error("Error while updating regions. {}", e.getMessage());
            }
        }
    }

    /**
     * Get current region. This method returns where this service is running.
     *
     * @return current region.
     */
    public String getCurrent() {
        return config.getRegion();
    }

    /**
     * Get region by region name
     *
     * @param regionName
     * @return region info
     */
    public RegionInfo getOne(String regionName) {
        return (RegionInfo) cache.get(regionName).get();
    }

    /**
     * Get region list of all clustered controller.
     *
     * @return region list
     */
    public Map<String, RegionInfo> getAll() {
        Map<String, RegionInfo> regions = Maps.newHashMap();
        if (config.isClustered()) {
            for (Object eachKey : ((Ehcache) (cache.getNativeCache())).getKeysWithExpiryCheck()) {
                ValueWrapper valueWrapper = cache.get(eachKey);
                if (valueWrapper != null && valueWrapper.get() != null) {
                    regions.put((String) eachKey, (RegionInfo) valueWrapper.get());
                }
            }
        }
        return regions;
    }

    public ArrayList<String> getAllVisibleRegionNames() {
        final ArrayList<String> regions = new ArrayList<String>();
        if (config.isClustered()) {
            for (Object eachKey : ((Ehcache) (cache.getNativeCache())).getKeysWithExpiryCheck()) {
                ValueWrapper valueWrapper = cache.get(eachKey);
                if (valueWrapper != null && valueWrapper.get() != null) {
                    final RegionInfo region = TypeConvertUtils.cast(valueWrapper.get());
                    if (region.isVisible()) {
                        regions.add((String) eachKey);
                    }
                }
            }
        }
        Collections.sort(regions);
        return regions;
    }

    Config getConfig() {
        return config;
    }

    /**
     * For unit test
     */
    public void setConfig(Config config) {
        this.config = config;
    }

    /**
     * For unit test
     */
    public void setCache(Cache cache) {
        this.cache = cache;
    }
}