Java tutorial
/* * Copyright 2016 VMware, Inc. All Rights Reserved. * * 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.vmware.photon.controller.clustermanager.templates; import com.vmware.photon.controller.clustermanager.servicedocuments.ClusterManagerConstants; import com.vmware.photon.controller.clustermanager.servicedocuments.FileTemplate; import com.google.common.base.Preconditions; import org.apache.commons.net.util.SubnetUtils; import java.nio.file.Paths; import java.util.HashMap; import java.util.List; import java.util.Map; /** * Defines the template for Swarm Etcd Nodes. */ public class SwarmEtcdNodeTemplate implements NodeTemplate { public static final String ETCD_USER_DATA_TEMPLATE = "swarm-etcd-user-data.template"; public static final String DNS_PROPERTY = "dns"; public static final String GATEWAY_PROPERTY = "gateway"; public static final String NETMASK_PROPERTY = "netmask"; public static final String ETCD_IPS_PROPERTY = "etcdIps"; public static final String VM_NAME_PREFIX = "etcd"; public String getVmName(Map<String, String> properties) { Preconditions.checkNotNull(properties, "properties cannot be null"); String hostId = properties.get(NodeTemplateUtils.HOST_ID_PROPERTY); return NodeTemplateUtils.generateHostName(VM_NAME_PREFIX, hostId); } public FileTemplate createUserDataTemplate(String scriptDirectory, Map<String, String> properties) { Preconditions.checkNotNull(scriptDirectory, "scriptDirectory cannot be null"); Preconditions.checkNotNull(properties, "properties cannot be null"); String dns = properties.get(DNS_PROPERTY); String gateway = properties.get(GATEWAY_PROPERTY); String netmask = properties.get(NETMASK_PROPERTY); String nodeIndexStr = properties.get(NodeTemplateUtils.NODE_INDEX_PROPERTY); int nodeIndex = Integer.parseInt(nodeIndexStr); List<String> etcdIps = NodeTemplateUtils.deserializeAddressList(properties.get(ETCD_IPS_PROPERTY)); String ipAddress = etcdIps.get(nodeIndex); String cidrSignature = new SubnetUtils(ipAddress, netmask).getInfo().getCidrSignature(); String etcdParameters = createEtcdParameters(etcdIps); Map<String, String> parameters = new HashMap<>(); parameters.put("$DNS", "DNS=" + dns); parameters.put("$GATEWAY", gateway); parameters.put("$ETCD_ID", Integer.toString(nodeIndex)); parameters.put("$ADDRESS", cidrSignature); parameters.put("$ETCD_PARAMETERS", etcdParameters); parameters.put("$ETCD_PORT", Integer.toString(ClusterManagerConstants.Swarm.ETCD_PORT)); parameters.put("$ETCD_PEER_PORT", Integer.toString(ClusterManagerConstants.Swarm.ETCD_PEER_PORT)); FileTemplate template = new FileTemplate(); template.filePath = Paths.get(scriptDirectory, ETCD_USER_DATA_TEMPLATE).toString(); template.parameters = parameters; return template; } public FileTemplate createMetaDataTemplate(String scriptDirectory, Map<String, String> properties) { Preconditions.checkNotNull(scriptDirectory, "scriptDirectory cannot be null"); Preconditions.checkNotNull(properties, "properties cannot be null"); return NodeTemplateUtils.createMetaDataTemplate(scriptDirectory, getVmName(properties)); } public static Map<String, String> createProperties(String dns, String gateway, String netmask, List<String> etcdAddresses) { Preconditions.checkNotNull(dns, "dns cannot be null"); Preconditions.checkNotNull(gateway, "gateway cannot be null"); Preconditions.checkNotNull(netmask, "netmask cannot be null"); Preconditions.checkNotNull(etcdAddresses, "etcdAddresses cannot be null"); Preconditions.checkArgument(etcdAddresses.size() > 0, "etcdAddresses should contain at least one address"); Map<String, String> properties = new HashMap<>(); properties.put(DNS_PROPERTY, dns); properties.put(GATEWAY_PROPERTY, gateway); properties.put(NETMASK_PROPERTY, netmask); properties.put(ETCD_IPS_PROPERTY, NodeTemplateUtils.serializeAddressList(etcdAddresses)); return properties; } private static String createEtcdParameters(List<String> etcdIps) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < etcdIps.size(); i++) { sb.append( "etcd" + i + "=http://" + etcdIps.get(i) + ":" + ClusterManagerConstants.Swarm.ETCD_PEER_PORT); if (i != etcdIps.size() - 1) { sb.append(","); } } return sb.toString(); } }