Building a SimpleDB Domain Administration Tool in Java

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Building a SimpleDB Domain Administration Tool
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} catch (Exception e) { Systemoutprintln(egetMessage()); } } private void loadCredentials() { try { initSimpledbFromDisk(); } catch (Exception e) { String errorMsg = "credentials not found in $HOME/awssecret"; throw new RuntimeException( errorMsg); } } private void initSimpledbFromDisk() throws Exception { Properties props = new Properties(); String home = SystemgetProperty("userhome"); propsload(new FileReader(new File(home, "awssecret"))); String accessKeyId = propsgetProperty("AWS_ACCESS_KEY_ID"); String secretAccessKey = propsgetProperty("AWS_SECRET_ACCESS_KEY"); simpleDb = new SimpleDB(accessKeyId, secretAccessKey); } protected AdminTool(String domainName) { thisdomain = domainName; } }
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At the main method entry point, you can see that the createInstance() method returns an AdminTool reference AdminTool is an abstract class that defines the common application features and delegates the specific implementation to a subclass In createInstance(), the command-line arguments are parsed and an appropriate subclass of AdminTool is instantiatedAny exception at this point or the failure to find a matching argument will fall through to the usage message, and the application will exit The main method ends by calling invoke() on the tool instanceThe invoke() method wraps the final two actions with exception handling If an exception is thrown from this point on, it will be caught here, the exception message will be printed, and the application will terminateThe final two steps are loading the AWS credentials via the loadCredentials() method and calling the abstract doInvoke() method, which contains the tool-specific code in the subclass The loadCredentials() method acts as a pass-through to the initSimpledbFromDisk() method, re-throwing any exception as a generic exception with the appropriate messageWithin initSimpledbFromDisk(), the file awssecret in the
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2 Getting Started with SimpleDB
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user home directory is loaded into a Properties objectThe Access Key ID and the Secret Access Key are retrieved and then used to initialize the SimpleDB client library The final member of the AdminTool class is the constructor that subclasses will use to store the target domain name
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Now that the base class has handled all the application setup, all that remains in each subclass is the specific tool operationThe ListingTool class shown in Listing 2-2 gives a first, but brief, look at coding with a SimpleDB client library
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Listing 2-2 ListingTooljava Implementation of List Domains
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public class ListingTool extends AdminTool { ListingTool() { super(null); } @Override void doInvoke() { for (String domain : simpleDblistDomains()) { Systemoutprintln(domain); } } }
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The ListDomains operation in SimpleDB returns a listing of all the domains for the given account Because no single domain name is required for this operation, the no-arg constructor passes null to the super class constructor in place of an actual domain name ListingTool overrides the doInvoke() method to loop through the results of the client library s listDomain() method, printing each name to the console
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The CreateTool class in Listing 2-3 is similar to the ListingTool class from Listing 2-2, with only a single constructor and an override of the doInvoke() method
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Listing 2-3 CreateTooljava Implementation of Domain Creation
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public class CreateTool extends AdminTool { public CreateTool(String domainName) { super(domainName); } @Override
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Building a SimpleDB Domain Administration Tool
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void doInvoke() { simpleDbcreateDomain(domain); Systemoutprintln("Domain created: " + domain); } }
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In this case, a domain name is required, so the CreateTool constructor declares a single String parameter and passes through to the super class constructor where it is stored The domain creation takes place with the call to the createDomain() method with the domain name as a parameter If the call returns successfully, a message is printed to the console Be aware that calls to the SimpleDB operation CreateDomain for domains that already exist have no effect, and an error is not raised
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Domain deletion is nearly identical to domain creation from a code perspective Listing 2-4 shows domain deletion
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Listing 2-4 DeleteTooljava Implementation of Domain Deletion
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public class DeleteTool extends AdminTool { public DeleteTool(String domainName) { super(domainName); } @Override void doInvoke() { simpleDbdeleteDomain(domain); Systemoutprintln("Domain deleted: " + domain); } }
The only difference between the DeleteTool class and the CreateTool class is the call to the SimpleDB library s deleteDomain() method and the text of the console message