Finding a Client for SimpleDB in Java

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Finding a Client for SimpleDB
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Whether you write your own library or use someone else s, you need a SimpleDB client to code againstThere is a directory of SimpleDB clients maintained at http://developer amazonwebservicescom on the SimpleDB discussion forumsThis list includes client libraries written and supported by AWS, as well as third-party librariesAWS provides SimpleDB client libraries for Java, C#, PHP, Perl, and VBNet This chapter uses the SimpleDB Reference Client developed in 10, Writing a SimpleDB Client:A Language-Independent Guide It is a Java client library specifically designed for the demonstration of SimpleDB concepts In later chapters, it serves as a guide for how to write a SimpleDB client in any programming language, but it is used here because it makes example code easy to understand
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Building a SimpleDB Domain Administration Tool
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Building a SimpleDB Domain Administration Tool
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One of the weaknesses of SimpleDB in its current form is the lack of robust and sophisticated toolingThe tooling for relational databases has become mature, and there are many tool options availableAmazon does provide a few basic tools and, in fact, continues to release new and better tools, but a lot of room still remains for innovationAmazon s strategy of providing the infrastructure building blocks around which an ecosystem of tools and services can grow seems to be working well for its other web services In time, client tooling could become a strong point for SimpleDB because one of the foundational principles is the small feature set on the service sideWe begin the examples by developing a domain administration tool
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Administration Tool Features
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Having a tool that can list all of your domains with the ability to create new domains is a pretty basic feature when using SimpleDBAmazon has released an Eclipse plug-in that allows you to do that, but it is only available while eclipse is runningWe are going to write this functionality in a command-line tool that will be available outside of an IDE In this section, we develop a stand-alone administration tool that you can to use to manage your domains The tool will have the following features:
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n n n n n
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A command-line interface Creation of new domains Deletion of existing domains Listing all the domains in your account Detailed listing for an existing domain
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Key Storage
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It is very important to treat your AWS credentials with care to prevent anyone from gaining unauthorized access to your account Beyond the risk of loss or compromising of your data, an unauthorized user will be able to run up potentially large usage charges I recommend that you never type your Access Key ID or Secret Access Key directly into source code files, even if it is only for sample codeAll the code in this book will pull the AWS keys from a separate file In the case of the admin tool in this section, the keys will be loaded from the file awssecret in the user s home directoryYou will need to create this file in order to allow the admin tool to authenticateThe format of the file is as follows:
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AWS_ACCESS_KEY_ID= AWS_SECRET_ACCESS_KEY=
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When you create this file, add the appropriate values for your account after the equal signs
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2 Getting Started with SimpleDB
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Implementing the Base Application
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The base application provides the code to parse the arguments and a framework to invoke the commands Because this is a command-line tool, the base application, shown in Listing 2-1, is very simple
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Listing 2-1 AdminTooljava Base Command-Line Application for the Admin Tool
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import javaio*; import javautil*; import comsimpledbbook*; public abstract class AdminTool { static String USAGE = "java AdminTool [-l] [-m] [-c] [-d] [domain]"; protected SimpleDB simpleDb; protected String domain; public static void main(String[] argz) { AdminTool tool = createInstance(argz); toolinvoke(); } private static AdminTool createInstance(String[] argz) { try { String cmd = argz[0]; if (cmdequals("-l")) { return new ListingTool(); } else if (cmdequals("-m")) { return new MetadataTool(argz[1]); } else if (cmdequals("-c")) { return new CreateTool(argz[1]); } else if (cmdequals("-d")) { return new DeleteTool(argz[1]); } } catch (Exception e) {} Systemerrprintln(USAGE); Systemexit(-1); return null; } abstract void doInvoke(); private void invoke() { try { loadCredentials(); doInvoke();
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