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From imesh <...@git.apache.org>
Subject [GitHub] stratos pull request: Google compute engine load balancing support...
Date Thu, 13 Aug 2015 03:50:15 GMT
Github user imesh commented on a diff in the pull request:

    https://github.com/apache/stratos/pull/419#discussion_r36938995
  
    --- Diff: extensions/load-balancer/gce-extension/src/main/java/org/apache/stratos/gce/extension/GCELoadBalancer.java
---
    @@ -0,0 +1,391 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you 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 org.apache.stratos.gce.extension;
    +
    +import org.apache.commons.logging.Log;
    +import org.apache.commons.logging.LogFactory;
    +import org.apache.stratos.gce.extension.config.GCEClusterConfigurationHolder;
    +import org.apache.stratos.gce.extension.config.GCEContext;
    +import org.apache.stratos.gce.extension.util.GCEOperations;
    +import org.apache.stratos.load.balancer.common.domain.*;
    +import org.apache.stratos.load.balancer.extension.api.LoadBalancer;
    +import org.apache.stratos.load.balancer.extension.api.exception.LoadBalancerExtensionException;
    +
    +import java.io.IOException;
    +import java.security.GeneralSecurityException;
    +import java.util.*;
    +
    +public class GCELoadBalancer implements LoadBalancer {
    +
    +    private static final Log log = LogFactory.getLog(GCELoadBalancer.class);
    +    //PROTOCOL should be TCP or UDP
    +    private static final String PROTOCOL = "TCP";
    +    private GCEOperations gceOperations;
    +    /**
    +     * One configuration object per cluster will be created
    +     * One cluster  has one target pool,one forwarding rule and a health check
    +     * This hash map is used to hold cluster IDs and corresponding configuration
    +     */
    +    private Map<String, GCEClusterConfigurationHolder> clusterToLoadBalancerConfigurationMap;
    +
    +    public GCELoadBalancer() throws IOException, GeneralSecurityException {
    +        gceOperations = new GCEOperations();
    +        clusterToLoadBalancerConfigurationMap = new HashMap<String, GCEClusterConfigurationHolder>();
    +
    +    }
    +
    +    /**
    +     * Listen to latest topology and update load balancer configuration
    +     *
    +     * @param topology latest topology to be configured
    +     * @return - true - if the load balancer was successfully configured. else false
    +     * @throws LoadBalancerExtensionException
    +     */
    +    @Override
    +    public boolean configure(Topology topology) throws LoadBalancerExtensionException
{
    +        log.info("Complete topology received. Configuring Load balancer ");
    +
    +        //this list is used to hold the current clusters available in topology and which
has at least one member.
    +        List<String> activeClusterIdList = new ArrayList<String>();
    +
    +        for (Service service : topology.getServices()) {
    +            for (Cluster cluster : service.getClusters()) { //for each cluster
    +
    +                //check whether this cluster has a load balancer configuration or not
    +                if (clusterToLoadBalancerConfigurationMap.containsKey(cluster.getClusterId()))
{
    +
    +                    if (log.isDebugEnabled()) {
    +                        log.debug("Reconfiguring the existing cluster: " + cluster.getClusterId());
    +                    }
    +
    +                    //It already has a entry in clusterToLoadBalancerConfigurationMap.
    +                    //Take it and update it as the given topology.
    +                    GCEClusterConfigurationHolder gceClusterConfigurationHolder = clusterToLoadBalancerConfigurationMap.
    +                            get(cluster.getClusterId());
    +
    +                    //if the cluster contains at least one member
    +                    if (!cluster.getMembers().isEmpty()) {
    +                        //that cluster contains at least one member
    +
    +                        if (log.isDebugEnabled()) {
    +                            log.debug("Cluster " + cluster.getClusterId() + " has one
or more members");
    +                        }
    +                        activeClusterIdList.add(cluster.getClusterId());
    +
    +                        //***************detect member changes and update**************//
    +
    +                        //check for newly created members
    +                        List<String> membersToBeAddedToTargetPool = new ArrayList<String>();
    +                        for (Member member : cluster.getMembers()) {
    +
    +                            if (member.getInstanceId() != null && !gceClusterConfigurationHolder.getMemberList().
    +                                    contains(member.getInstanceId())) {
    +                                    if (log.isDebugEnabled()) {
    +                                        log.debug("New member found: " + member.getInstanceId());
    +                                    }
    +                                    membersToBeAddedToTargetPool.add(member.getInstanceId());
    +                            }
    +                        }
    +
    +                        if (!membersToBeAddedToTargetPool.isEmpty()) { //we have new
members
    +                            log.info("New members in cluster" + cluster.getClusterId()
+ " found. Adding new members " +
    +                                    "to cluster");
    +
    +                            //add them to configuration holder
    +                            for (String memberId : membersToBeAddedToTargetPool) {
    +                                gceClusterConfigurationHolder.addMember(memberId);
    +
    +                            }
    +
    +                            //add them to target pool too
    +                            gceOperations.addInstancesToTargetPool(membersToBeAddedToTargetPool,
    +                                    gceClusterConfigurationHolder.getTargetPoolName());
    +                        }
    +
    +                        //check for terminated members and remove them from cluster
    +                        List<String> membersToBeRemovedFromTargetPool = new ArrayList<String>();
    +                        for (String memberId : gceClusterConfigurationHolder.getMemberList())
{ //for all members in Map
    +                            boolean found = false;
    +                            for (Member member : cluster.getMembers()) { //for all members
in cluster
    +                                if (member.getInstanceId().equals(memberId)) {
    +                                    found = true;
    +                                    break;
    +                                }
    +                            }
    +                            if (!found) {
    +                                //add member id to membersToBeRemovedFromTargetPool in
order remove member from map
    +                                if (log.isDebugEnabled()) {
    +                                    log.debug("Terminated member found: " + memberId);
    +                                }
    +                                membersToBeRemovedFromTargetPool.add(memberId);
    +                            }
    +                        }
    +
    +                        if (!membersToBeRemovedFromTargetPool.isEmpty()) { //found terminated
members
    +                            log.info("Terminated members found in cluster " + cluster.getClusterId()
+ ". Removing them");
    +
    +                            //remove them from configuration holder
    +                            for (String memberId : membersToBeRemovedFromTargetPool)
{
    +                                gceClusterConfigurationHolder.removeMember(memberId);
    +
    +                            }
    +
    +                            //remove them from GCE too
    +                            gceOperations.removeInstancesFromTargetPool(membersToBeRemovedFromTargetPool,
    +                                    gceClusterConfigurationHolder.getTargetPoolName());
    +                        }
    +
    +                    }
    +
    +                } else {
    +                    //doesn't have a GCEClusterConfigurationHolder object. So crate a
new one and add to hash map
    +
    --- End diff --
    
    Please remove the blank line.


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