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In this chapter we also drop the formalism of patterns Most of the implementation mechanisms are included within the major parallel programming environments Hence, rather than use patterns, we provide a high level description of each implementation mechanism and then investigate how the mechanism maps onto our three target programming environments: OpenMP, MPI, and Java This mapping will in some cases be trivial and require little more than presenting an existing construct in an API or language The discussion will become interesting when we look at operations native to one programming model, but foreign to another For example, it is possible to do message passing in OpenMP It is not pretty, but it works and can be useful at times We assume that the reader is familiar with OpenMP, MPI, and Java and how they are used for writing parallel programs Although we cover specific features of these APIs in this chapter, the details of using them are left to the appendixes

package comsimpledbbooktasklist; import javaniocharsetCharset; import javasecurity*; import javautil*; import comsimpledbbook*; import comsunorgapachexercesinternalimpldvutilBase64; public class UserService { private static final String SALT = "Salting-Thwarts-Rainbow-Attack"; private static final Charset UTF_8 = CharsetforName("UTF-8"); private static final String AUTH_GROUP = "AUTH_GROUP"; private static final String PASSWORD = "PASSWORD"; private static final String ENABLED = "ENABLED"; private MessageDigest MD5; private SimpleDB sdb; private String domainName; public UserService(SimpleDB simpleDB, String domain) { sdb = simpleDB;

Each of these technologies allows methods of an object to be invoked from a remote application executing in a separate JVM Both are covered in more detail in later chapters

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Parallel programs exploit concurrency by mapping instructions onto multiple UEs At a very basic level, every parallel program needs to (1) create the set of UEs, (2) manage interactions between them and their access to shared resources, (3) exchange information between UEs, and (4) shut them down in an orderly manner This suggests the following categories of implementation mechanisms

Since all of the handler functions take the same parameters (an instance of HttpServletRequest and HttpServletReponse), it is easy to write a handler for either GET or POST that passes control off to the other This means that if you accidentally specify the wrong HTTP method in your HTML forms, the servlet will handle it gracefully For example, to pass GET requests off to a POST method, you could add the following lines:

domainName = domain; try { MD5 = MessageDigestgetInstance("MD5"); } catch (NoSuchAlgorithmException cannotHappen) {} } public String createUser(String name, String pass, String group){ Item item = new Item(name); itemaddAttribute(PASSWORD, hash(pass)); itemaddAttribute(ENABLED, BooleanTRUEtoString()); itemaddMultiValuedAttr(AUTH_GROUP, group); try { sdbputIfNotExists(domainName, item, PASSWORD); } catch (RuntimeException e) { // condition failed throw new UserNameUnavailable(); } return itemgetName(); } public void deleteUser(String name) { sdbdelete(domainName, new Item(name)); } private String hash(String pass) { byte[] salted = (SALT + pass)getBytes(UTF_8); byte[] hash; synchronized (MD5) { hash = MD5digest(salted); } return Base64encode(hash); } public List<String> authenticate(String userName, String password) { Item user = sdbget(domainName, userName); String suppliedCredential = hash(password); String storedCredential = usergetAttribute(PASSWORD); if (! suppliedCredentialequals(storedCredential)) { throw new AuthenticationFailure(); } return usergetAttributes(AUTH_GROUP); } public void addAuthGroup(String userName, String group) { Item item = new Item(userName); itemaddMultiValuedAttr(AUTH_GROUP, group); sdbput(domainName, item);

Synchronization Enforcing constraints on the ordering of events occurring in different UEs This is primarily used to ensure that shared resources are accessed by a collection of UEs in such a way that the program is correct regardless of how the UEs are scheduled Communication The exchange of information between UEs

public void doGet (HttpServletRequest req, HttpServletResponse res) throws IOException { doPost(req,res); }

} public void removeAuthGroup(String userName, String group) { Item item = new Item(userName); itemaddMultiValuedAttr(AUTH_GROUP, group); sdbdelete(domainName, item); } public List<String> listUsers(String group) { String query = "SELECT itemName() FROM `" + domainName + "` WHERE " + AUTH_GROUP + " = '" + group + "'"; List<Item> items = sdbselectWithRealLimit(query, 100000); List<String> result = new ArrayList<String>(); for (Item item: items) { resultadd(itemgetName()); } return result; } }

Once a servlet handler function is called, it can respond to the request and its parameters, perform some processing, and then output a response However, developers should be mindful of the fact that each servlet is capable of servicing multiple requests simultaneously, so normal thread safety issues apply Finally, when the Web server shuts down or terminates a servlet due to inactivity after a specified period of time, the destroy() method will be invoked This is the servlet's last opportunity to close open files, remove temporary or unnecessary data files, commit changes to disk, or close open network/database connections As with applets, servlets have a definite lifecycle from creation to destruction First the init() method is called, followed by one or more service() requests, and finally a destroy() call is made

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The GET and POST HTTP request types are used to retrieve data from a Web server, and both have the ability to encode parameters into the request The only major difference between them is that GET has a limit of 255 characters for its parameters, while POST has no limit A GET request involves using a question mark in the URL to signify that the rest of the URL includes encoded parameters An example of a simple GET request that encodes parameters is:

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