Domain Metadata in Java

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The final tool in the AdminTool arsenal is the MetadataTool, found in Listing 2-5This tool has a lot more code to it, but only the first line of the doInvoke() method pertains directly to SimpleDBThe remainder is code that gets and formats the values
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Listing 2-5 MetadataTooljava Implementation of Domain Metadata
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import static javalangSystem*; import javautil*;
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2 Getting Started with SimpleDB
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public class MetadataTool extends AdminTool { public MetadataTool(String domainName) { super(domainName); } @Override void doInvoke() { Map<String, Long> info = simpleDbdomainMetadata(domain); long epochMillis = infoget("Timestamp") * 1000L; long deltaMillis = SystemcurrentTimeMillis() - epochMillis; double deltaHours = deltaMillis / 3600000D; long items = infoget("ItemCount"); long itemNameBytes = infoget("ItemNamesSizeBytes"); long attrNames = infoget("AttributeNameCount"); long attrNameBytes = infoget("AttributeNamesSizeBytes"); long attrValues = infoget("AttributeValueCount"); long attrValueBytes = infoget("AttributeValuesSizeBytes"); long totalBytes = itemNameBytes + attrNameBytes + attrValueBytes; double totalGB = totalBytes/ONE_GB; String headerA = "'%s' using %2f%% of 10GB capacity"; String headerB = " (as of %1f hours ago)\n"; outprintf(headerA + headerB, domain, totalGB, deltaHours); String lineFmt = "%16s: %,10d (%,d bytes)\n"; outprintf(lineFmt, "Item names", items, itemNameBytes); outprintf(lineFmt, "Attribute names", attrNames, attrNameBytes); outprintf(lineFmt, "Attribute values", attrValues, attrValueBytes); }
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The call to the client method domainMetadata() returns a map of metadata entry names to numeric valuesAmazon serves the DomainMetadata operation values from a cache and not necessarily from a fresh computation at the time of the callThe data provides a recent picture of the domain s state typically from within the past 24 hoursThe timestamp entry tells you the cache time for this domain s metadata values MetadataTool uses the timestamp to calculate the metadata s age in hours There are three remaining dimensions of your domain described by the metadata: items, attribute names, and attribute values For each of these is both a count that is given and storage size in bytes MetadataTool pulls each of these values from the map, calculates the percentage of storage capacity in use, and then prints it all out to the console with some formatting
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Building a User Authentication Service
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Before you can compile and run the tool, you ll need to have the Java Development Kit (JDK) 16 or later installedThe classpath also needs to be set so that it can find the SimpleDB client code imported by the toolYou can compile these five source files from the 2 source code directory and set the classpath with the following command:
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javac cp SimpleDBClientjar *java
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After you compile these classes, you can run the domain-listing tool with the following command:
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java AdminTool -l
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If you are new to SimpleDB and have not yet created any domains, this tool prints no output for you yetYou can create a domain with the following command:
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The length of domain names has to be between 3 and 255 characters, and there are rules covering which characters the CreateDomain operation will acceptThe only characters you are allowed to use in domain names are a z,A Z, 0 9, _ , - , and
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This tool is useful for simple administration tasks, and it can be bundled into a Jar file for quick deployment on any platform that can run Java Bundling the application in a jar file is done with the jar command-line tool that comes with the Java Development Kit (JDK)You will have to provide a manifest file that declares AdminTool as your MainClass and provide that file as an argument to the jar tool Once it is packaged, you can run the tool in a similar way using the command line:
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where AdminTooljar is the name of your jar fileYou can learn more about jar files from the Java website: http://javasuncom/docs/books/tutorial/deployment/jar/
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Building a User Authentication Service
The requirement for user authentication is a common one: It is necessary in any publicly facing web application or web serviceThere are many ways to provide methods of user password collection, and there are just as many alternatives for storing that data In many private intranet applications, there is a need to integrate with an existing authentication system, such as LDAP,Active Directory, or NTLM On the public Internet, relational database tables are a more likely choice In this section, you learn how to use SimpleDB as the data store for a user authentication service