e702. determining when a print job has finished.txt

这里面包含了一百多个JAVA源文件

Since DocPrintJob.print() is not guaranteed to be synchronous, it is necessary to watch for a print job completion event before closing the input stream. This example implements a convenient class that you can use while waiting for a print job to finish. 
    try {
        // Open the image file
        InputStream is = new BufferedInputStream(
            new FileInputStream("filename.gif"));
        // Create the print job
        DocPrintJob job = service.createPrintJob();
        Doc doc = new SimpleDoc(is, flavor, null);
    
        // Monitor print job events
        PrintJobWatcher pjDone = new PrintJobWatcher(job);
    
        // Print it
        job.print(doc, null);
    
        // Wait for the print job to be done
        pjDone.waitForDone();
    
        // It is now safe to close the input stream
        is.close();
    } catch (PrintException e) {
    } catch (IOException e) {
    }
    
    class PrintJobWatcher {
        // true iff it is safe to close the print job's input stream
        boolean done = false;
    
        PrintJobWatcher(DocPrintJob job) {
            // Add a listener to the print job
            job.addPrintJobListener(new PrintJobAdapter() {
                public void printJobCanceled(PrintJobEvent pje) {
                    allDone();
                }
                public void printJobCompleted(PrintJobEvent pje) {
                    allDone();
                }
                public void printJobFailed(PrintJobEvent pje) {
                    allDone();
                }
                public void printJobNoMoreEvents(PrintJobEvent pje) {
                    allDone();
                }
                void allDone() {
                    synchronized (PrintJobWatcher.this) {
                        done = true;
                        PrintJobWatcher.this.notify();
                    }
                }
            });
        }
        public synchronized void waitForDone() {
            try {
                while (!done) {
                    wait();
                }
            } catch (InterruptedException e) {
            }
        }
    }