Java tutorial
/* * 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.jclouds.examples.rackspace.cloudloadbalancers; import com.google.common.collect.Lists; import com.google.common.collect.Sets; import com.google.common.io.Closeables; import org.jclouds.ContextBuilder; import org.jclouds.compute.domain.NodeMetadata; import org.jclouds.examples.rackspace.cloudservers.CloudServersPublish; import org.jclouds.rackspace.cloudloadbalancers.v1.CloudLoadBalancersApi; import org.jclouds.rackspace.cloudloadbalancers.v1.domain.*; import org.jclouds.rackspace.cloudloadbalancers.v1.features.LoadBalancerApi; import org.jclouds.rackspace.cloudloadbalancers.v1.predicates.LoadBalancerPredicates; import java.io.Closeable; import java.io.IOException; import java.util.List; import java.util.Set; import java.util.concurrent.TimeoutException; import static org.jclouds.examples.rackspace.cloudloadbalancers.Constants.*; import static org.jclouds.rackspace.cloudloadbalancers.v1.domain.VirtualIP.Type.PUBLIC; import static org.jclouds.rackspace.cloudloadbalancers.v1.domain.internal.BaseLoadBalancer.Algorithm.RANDOM; import static org.jclouds.rackspace.cloudloadbalancers.v1.domain.internal.BaseNode.Condition.ENABLED; /** * This example creates a Load Balancer with new Cloud Servers on the Rackspace Cloud. * */ public class CreateLoadBalancerWithNewServers implements Closeable { private final CloudLoadBalancersApi clbApi; private final LoadBalancerApi lbApi; /** * To get a username and API key see http://jclouds.apache.org/guides/rackspace/ * * The first argument (args[0]) must be your username * The second argument (args[1]) must be your API key */ public static void main(String[] args) throws IOException { CreateLoadBalancerWithNewServers createLoadBalancer = new CreateLoadBalancerWithNewServers(args[0], args[1]); try { List<String> argsList = Lists.newArrayList(args); argsList.add("2"); // the number of Cloud Servers to start Set<? extends NodeMetadata> nodes = CloudServersPublish.getPublishedCloudServers(argsList); Set<AddNode> addNodes = createLoadBalancer.createNodeRequests(nodes); createLoadBalancer.createLoadBalancer(addNodes); } catch (Exception e) { e.printStackTrace(); } finally { createLoadBalancer.close(); } } public CreateLoadBalancerWithNewServers(String username, String apiKey) { clbApi = ContextBuilder.newBuilder(PROVIDER).credentials(username, apiKey) .buildApi(CloudLoadBalancersApi.class); lbApi = clbApi.getLoadBalancerApi(REGION); } /** * AddNodes specify the nodes (Cloud Servers) that requests will be sent to by the Load Balancer. */ private Set<AddNode> createNodeRequests(Set<? extends NodeMetadata> nodes) { Set<AddNode> addNodes = Sets.newHashSet(); for (NodeMetadata node : nodes) { String privateAddress = node.getPrivateAddresses().iterator().next(); AddNode addNode = AddNode.builder().address(privateAddress).condition(ENABLED).port(80).weight(20) .build(); addNodes.add(addNode); } return addNodes; } /** * Create a Load Balancer that randomly distributes requests to its nodes. Normally you will want to use a * different algorithm for your Load Balancers (see LoadBalancer.Algorithm) but random nicely demonstrates * how requests are sent to diffent nodes when you reload the "Go to" URL printed out in the terminal. * * To see an example of creating a Load Balancer with existing Cloud Servers see * CreateLoadBalancerWithExistingServers. */ private void createLoadBalancer(Set<AddNode> addNodes) throws TimeoutException { System.out.format("Create Cloud Load Balancer%n"); CreateLoadBalancer createLB = CreateLoadBalancer.builder().name(NAME).protocol("HTTP").port(80) .algorithm(RANDOM).nodes(addNodes).virtualIPType(PUBLIC).build(); LoadBalancer loadBalancer = lbApi.create(createLB); // Wait for the Load Balancer to become Active before moving on // If you want to know what's happening during the polling, enable logging. See // /jclouds-example/rackspace/src/main/java/org/jclouds/examples/rackspace/Logging.java if (!LoadBalancerPredicates.awaitAvailable(lbApi).apply(loadBalancer)) { throw new TimeoutException("Timeout on loadBalancer: " + loadBalancer); } System.out.format(" %s%n", loadBalancer); System.out.format(" Go to http://%s%n", getVirtualIPv4(loadBalancer.getVirtualIPs())); } private String getVirtualIPv4(Set<VirtualIPWithId> set) { for (VirtualIPWithId virtualIP : set) { if (virtualIP.getType().equals(PUBLIC) && virtualIP.getIpVersion().equals(VirtualIP.IPVersion.IPV4)) { return virtualIP.getAddress(); } } throw new RuntimeException("Public IPv4 address not found."); } /** * Always close your service when you're done with it. * * Note that closing quietly like this is not necessary in Java 7. * You would use try-with-resources in the main method instead. */ public void close() throws IOException { Closeables.close(clbApi, true); } }