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Now, the Librarian, Borrower, and BorrowedBook models are obvious in what they represent, but Authentication isn t as easy. Simply put, Authentication contains the username and password of either a Borrower or a Librarian, or both. So, it s the object that s used for authentication, and you can share this authentication between a Borrower and a Librarian if you want. The migration for Authentication is more or less what you would expect: class CreateAuthentications < ActiveRecord::Migration class Authentication < ActiveRecord::Base; end def self.up create_table :authentications do |t| t.column :username, :string t.column :password, :string end Authentication.create :username => 'admin', :password => 'admin' end def self.down drop_table :authentications end end You need to bootstrap by creating a simple authentication for admin. The actual database table is just two strings and the regular Rails ID.

public class TestHttpGet { public String executeHttpGetWithRetry() throws Exception { int retry = 3; int count = 0; while (count < retry) { count += 1; try { String response = executeHttpGet(); /** * if we get here, that means we were successful and we can * stop. */ return response; } catch (Exception e) { /** * if we have exhausted our retry limit */ if (count < retry) { /** * we have retries remaining, so log the message and go * again. */ System.out.println(e.getMessage()); } else { System.out.println("could not succeed with retry..."); throw e; } } }

<rich:dataTable id="statesTable" value="#{statesBean.statesList}" var="state"> <h:column> <f:facet name="header">State</f:facet> <h:outputText value="#{state.name}" /> <rich:toolTip mode="client" > <h:panelGrid> <h:outputText value="#{state.name}" style="font-weight:bold"/> <h:outputText value="#{state.capital}" /> <h:graphicImage value="#{state.flagImage}"/> </h:panelGrid> </rich:toolTip> </h:column> </rich:dataTable> This produces the following:

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return null; } public String executeHttpGet() throws Exception { BufferedReader in = null; try { HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(); request.setURI(new URI("http://code.google.com/android/")); HttpResponse response = client.execute(request); in = new BufferedReader(new InputStreamReader(response.getEntity() .getContent())); StringBuffer sb = new StringBuffer(""); String line = ""; String NL = System.getProperty("line.separator"); while ((line = in.readLine()) != null) { sb.append(line + NL); } in.close(); String result = sb.toString(); return result; } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } } } The code in Listing 8-5 shows how you can implement a simple retry technique to recover from timeouts when making HTTP calls. The listing shows two methods: one that executes an HTTP GET (executeHttpGet()), and another that wraps this method with the retry logic (executeHttpGetWithRetry()). The logic is very simple. We set the number of retries we want to attempt to 3, and then we enter a while loop. Within the loop, we execute the request. Note that the request is wrapped with a try/catch block, and in the catch block we check whether we have exhausted the number of retry attempts. When using the HttpClient as part of a real-world application, you need to pay some attention to multithreading issues that might come up. Let s delve into this now.

The second migration is CreateLibrarian, which only is a list of Authentications that have access to administrate the library: class CreateLibrarians < ActiveRecord::Migration class Authentication < ActiveRecord::Base; end class Librarian < ActiveRecord::Base; end def self.up create_table :librarians do |t| t.column :name, :string t.column :authentication_id, :integer end Librarian.create :name => 'Administrator', :authentication => Authentication.find_by_username('admin') end def self.down drop_table :librarians end end You also added a name, for good measure, and also made sure that there is at least one Librarian from the beginning, so you can create more of them later on. Notice that you need to define both an Authentication model and a Librarian model within the migration, so that you have access to them. You can t use the class created in CreateAuthentications, because that one was confined to the scope of that class, and it s even possible that the Rails migration engine tears down everything between different parts of the migration. The Borrower migration is almost the same as the Librarian one, except that you don t need to create any initial Borrower; it will be possible for Borrowers to register their own accounts later on: class CreateBorrowers < ActiveRecord::Migration def self.up create_table :borrowers do |t| t.column :name, :string t.column :email, :string t.column :authentication_id, :integer end end def self.down drop_table :borrowers end end Finally, here s the model that represents the borrowed books of a Borrower: class CreateBorrowedBooks < ActiveRecord::Migration def self.up create_table :borrowed_books do |t| t.column :book_description_id, :integer t.column :library_id, :integer

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