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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