Examples of org.fcrepo.server.journal.JournalWriter

org.fcrepo.server.journal.JournalWriter

The abstract base for all JournalWriter classes.

Each child class is responsible for providing an XMLEventWriter that will receive the JournalEntry tag. This class will format a JournalEntry object into XML and add it to the XMLEventWriter.

Note that the writing of an entry is necessarily a three step process, consisting of

calling {@link #prepareToWriteJournalEntry()},
invoking the management method,
calling {@link #writeJournalEntry(CreatorJournalEntry)}

Several factors combine to require this sequence.

Each new journal file starts with a repository hash.
Repository hashes are expensive to calculate (on the order of 10 seconds). We don't want to calculate a hash unless it is needed for a new journal file.
We cannot predict in advance which journal entry will require that a new journal file be opened. The preceding file may be closed asynchronously as a result of a period of inactivity.
The repository hash must be calculated before the management method is invoked, so the receiver can confirm the file before making any changes to its own repository.
The journal entry must be written after the management method is invoked. The management method may add values to the context object in the {@link CreatorJournalEntry}, and these values must be written to the journal.

@author Jim Blake

                        {"classname", MockTransport.class.getName()},
                        {"crucial", "true"}});
        addTransportParameters("one", transportOneParameters);
        addTransportParameters("two", transportTwoParameters);


        JournalWriter writer =
                JournalWriter.getInstance(parameters, DUMMY_ROLE, server);
        assertSame("JournalWriter is the wrong class",
                   MulticastJournalWriter.class,
                   writer.getClass());
        MulticastJournalWriter mjw = (MulticastJournalWriter) writer;


        Map<String, Transport> transports = mjw.getTransports();
        assertEquals("should be two transports", 2, transports.size());
        assertEquals("transport one class", MockTransport.class, transports

Examples of org.fcrepo.server.journal.JournalWriter

Related Classes of org.fcrepo.server.journal.JournalWriter