Patterns in JavaTM, Volume 3 Java Enterprise Java Enterprise Design Patterns phần 9 docx

... thing that you should do to ensure the consis-tency of a transaction is testing. The Unit Testing and System Testing patterns described in Patterns in Java, Volume 2 are useful in designingappropriate ... in Volume 2)ŸThe Copy Mutable Parameters pattern (described in Volume 2)ŸThe Copy on Write Proxy pattern, which is used as an example in thedescription of the Proxy pattern in Volume 1 In ... ObjectInputStream object, you can write some codethat looks like this:FileInputStream fin = new FileInputSteam("filename.ser");ObjectInputStream obIn = new ObjectInputStream(fin);This...

... collaboration are worth examining in greater detail.Completion of Pending CallsIt may be possible for the new instance to finish what the oldinstance started if everything it needs to finish is copied ... way of doing things and Java s way of doing things.Remote Method Invocation (RMI) is a Java- based Object RequestBroker implementation that is part of the core Java API. Because RMI is Java- based, ... detecting the failureof a component.Voting is a general-purpose way to detect that some components in aset of redundant components are performing incorrectly. Voting works byobserving the...

... writing software for a new kind of smart food processor that turnsraw ingredients into cooked, ready-to-eat food by slicing, dicing, mixing,boiling, baking, frying, and/or stirring the ingredients. ... CORBA naming service. Instead of bindingnames to proxies, it binds them to something called an InteroperableObject Reference (IOR). An IOR is a string that has, embedded in it, all of the information ... getInfo() {int x = 0; return x;} // getInfo()public void setInfo(int x) { } // setInfo(int)public void doIt() { } // doIt()} // interface ServiceIFThe ProtectionProxy class is more interesting...

... = this .in; int c1 = in. read();int c2 = in. read();int c3 = in. read();int c4 = in. read();if ((c1 | c2 | c3 | c4) < 0)throw new EOFException();Distributed Computing Patterns ■2273A. Call ... read(byte[], int, int)The read method uses the readInt method to read the byte countsthat the server inserts into the data stream.private final int readInt() throws IOException {InputStream in = ... of data bytes in the incoming message.4C .3. The Multiplexer object reads the data bytes in the incomingmessage into an internal buffer.4C.4. The Multiplexer object passes its internal buffer...

... object.InputStream in = actualSocket.getInputStream();int otherBufferSize= new DataInputStream (in) .readInt();BufferedInputStream bin;bin = new BufferedInputStream (in) ;actualIn = new DataInputStream(bin);// ... connection.266■CHAPTER SIXRELATED PATTERNS Singleton. The Singleton pattern (described in Volume 1) uses asingle instance of a class for an entire program. The Session pat-tern uses a single instance of a class ... occurs.*/protected InputStream getInputStream() throws IOException {checkClosed();if (in= =null || in. isClosed()) { in = new ChunkedInputStream(theSocket);} // ifreturn in; } // getInputStream()/***...

... findInsertionIndex(node);expirations.add(insertionIndex, node);} // scheduleRemoval(LinkedList)/*** Determine where in a LinkedList an object belongs* based on expiration times.*/private int findInsertionIndex(LinkedList ... TransactionHistory by* putting its LinkedList object in an ArrayList that* is sorted by expiration time.*/synchronized void scheduleRemoval(LinkedList node) {int insertionIndex = findInsertionIndex(node);expirations.add(insertionIndex, ... if// use binary search to find correct index.int lowerBound = 0;while (upperBound>=lowerBound) {int midpoint= (upperBound-lowerBound)/2 + lowerBound;long midpointExpiration;midpointExpiration...

... ifint latestIndex = 0;Interval latestInterval = intervals[latestIndex];for (int i=1; i<length; i++) {if (intervals[i].endsAfter(latestInterval)) {latestIndex = i;latestInterval = intervals[i];Temporal ... ifint latestIndex = 0;Interval latestInterval = intervals[latestIndex];for (int i=1; i<length; i++) {if (intervals[i].endsAfter(latestInterval)) {latestIndex = i;latestInterval = intervals[i];} ... struc-ture responsible for associating BusinessObjectState instances with aninterval of time and finding the appropriate BusinessObjectStateinstance for a given point in time. The details of this...

... String name = rs.getString(2);String cuisine = rs.getString (3) ; // Create the <code>Restaurant</code> object.thisRestaurant = new Restaurant(id);thisRestaurant.setCuisine(cuisine);thisRestaurant.setMinPrice(minDollarAmt); ... database.Database Patterns ■4 09 •It will throw an exception to indicate something about removing theobject that would violate a business rule.•It will throw at least one other kind of exception to indicate ... is shown in Figure 9. 14.Here are descriptions of the interactions shown in Figure 9. 14:1. An object responsible for persisting some complex objects isasked to retrieve one.1.1. In the course...

... thisRestaurant;} // ifString name = rs.getString(2);String cuisine = rs.getString (3) ; int rating = rs.getInt(6);Integer starRating= (rating>=1 ? new Integer(rating): null);boolean deliveryAvailable= ... pattern, 32 5 33 5and Cache Management pattern(described in vol. 1), 33 4 33 5and Heavyweight/Lightweightpattern, 33 5and Scheduler pattern (described in vol. 1), 33 5Essential use case, 31 FFacade ... 1 29 132 Mobile Agent pattern, 1 19 127Object Replication pattern, 99 –107Object Request Broker (ORB)pattern, 89 98 Process Pairs pattern, 133 – 135 Prompt Repair pattern, 115–118Redundant Independent...