org.fcrepo.server.journal
Class JournalReader

java.lang.Object
  org.fcrepo.server.journal.xmlhelpers.AbstractXmlReader
      org.fcrepo.server.journal.JournalReader

All Implemented Interfaces:

JournalConstants

Direct Known Subclasses:

MultiFileJournalReader, SingleFileJournalReader

public abstract class JournalReader
extends AbstractXmlReader
implements JournalConstants

The abstract base for all JournalReader classes.

Each child class is responsible for providing an XMLEventReader that is positioned at the beginning of a JournalEntry tag. This class will read the entry and leave the XMLEventReader positioned after the corresponding closing tag.

Author:

Jim Blake

Field Summary

protected Map<String,String>	parameters
protected JournalRecoveryLog	recoveryLog
protected String	role
protected ServerInterface	server

Fields inherited from interface org.fcrepo.server.journal.JournalConstants

ARGUMENT_NAME_ALT_IDS, ARGUMENT_NAME_CHECKSUM, ARGUMENT_NAME_CHECKSUM_TYPE, ARGUMENT_NAME_CONTEXT, ARGUMENT_NAME_CONTROL_GROUP, ARGUMENT_NAME_DATATYPE, ARGUMENT_NAME_DISSEMINATOR_ID, ARGUMENT_NAME_DISSEMINATOR_LABEL, ARGUMENT_NAME_DISSEMINATOR_STATE, ARGUMENT_NAME_DS_CONTENT, ARGUMENT_NAME_DS_ID, ARGUMENT_NAME_DS_LABEL, ARGUMENT_NAME_DS_LOCATION, ARGUMENT_NAME_DS_STATE, ARGUMENT_NAME_ENCODING, ARGUMENT_NAME_END_DATE, ARGUMENT_NAME_FORCE, ARGUMENT_NAME_FORMAT, ARGUMENT_NAME_FORMAT_URI, ARGUMENT_NAME_IN, ARGUMENT_NAME_IS_LITERAL, ARGUMENT_NAME_LABEL, ARGUMENT_NAME_LAST_MODIFIED_DATE, ARGUMENT_NAME_LOCATION, ARGUMENT_NAME_LOG_MESSAGE, ARGUMENT_NAME_MIME_TYPE, ARGUMENT_NAME_NAMESPACE, ARGUMENT_NAME_NEW_PID, ARGUMENT_NAME_NUM_PIDS, ARGUMENT_NAME_OBJECT, ARGUMENT_NAME_OWNERID, ARGUMENT_NAME_PID, ARGUMENT_NAME_RELATIONSHIP, ARGUMENT_NAME_SERIALIZATION, ARGUMENT_NAME_START_DATE, ARGUMENT_NAME_STATE, ARGUMENT_NAME_VERSION_DATE, ARGUMENT_NAME_VERSIONABLE, ARGUMENT_TYPE_BINDING_MAP, ARGUMENT_TYPE_BOOLEAN, ARGUMENT_TYPE_DATE, ARGUMENT_TYPE_INTEGER, ARGUMENT_TYPE_NULL, ARGUMENT_TYPE_STREAM, ARGUMENT_TYPE_STRING, ARGUMENT_TYPE_STRINGARRAY, CONTEXT_MAPNAME_ACTION, CONTEXT_MAPNAME_ENVIRONMENT, CONTEXT_MAPNAME_RECOVERY, CONTEXT_MAPNAME_RESOURCE, CONTEXT_MAPNAME_SUBJECT, DEFAULT_AGE_LIMIT, DEFAULT_FILENAME_PREFIX, DEFAULT_SIZE_LIMIT, DOCUMENT_ENCODING, DOCUMENT_VERSION, FORMAT_JOURNAL_FILENAME_TIMESTAMP, METHOD_ADD_DATASTREAM, METHOD_ADD_DISSEMINATOR, METHOD_ADD_RELATIONSHIP, METHOD_GET_NEXT_PID, METHOD_INGEST, METHOD_MODIFY_DATASTREAM_BY_REFERENCE, METHOD_MODIFY_DATASTREAM_BY_VALUE, METHOD_MODIFY_DISSEMINATOR, METHOD_MODIFY_OBJECT, METHOD_PURGE_DATASTREAM, METHOD_PURGE_DISSEMINATOR, METHOD_PURGE_OBJECT, METHOD_PURGE_RELATIONSHIP, METHOD_PUT_TEMP_STREAM, METHOD_SET_DATASTREAM_STATE, METHOD_SET_DATASTREAM_VERSIONABLE, METHOD_SET_DISSEMINATOR_STATE, PARAMETER_IGNORE_HASH, PARAMETER_JOURNAL_FILE_AGE_LIMIT, PARAMETER_JOURNAL_FILE_SIZE_LIMIT, PARAMETER_JOURNAL_FILENAME_PREFIX, PARAMETER_JOURNAL_MODE, PARAMETER_JOURNAL_READER_CLASSNAME, PARAMETER_JOURNAL_RECOVERY_LOG_CLASSNAME, PARAMETER_JOURNAL_WRITER_CLASSNAME, PARAMETER_RECOVERY_LOG_FILENAME, PARAMETER_RECOVERY_LOG_LEVEL, PASSWORD_CIPHER_TYPE, QNAME_ATTR_BIND_KEY_NAME, QNAME_ATTR_BIND_LABEL, QNAME_ATTR_CLIENT_IP, QNAME_ATTR_DATASTREAM_ID, QNAME_ATTR_DS_BIND_MAP_ID, QNAME_ATTR_DS_BIND_MAP_LABEL, QNAME_ATTR_DS_BIND_MECHANISM_PID, QNAME_ATTR_LOGIN_ID, QNAME_ATTR_METHOD, QNAME_ATTR_NAME, QNAME_ATTR_PASSWORD_TYPE, QNAME_ATTR_REPOSITORY_HASH, QNAME_ATTR_SEQ_NO, QNAME_ATTR_STATE, QNAME_ATTR_TIMESTAMP, QNAME_ATTR_TYPE, QNAME_ATTR_USERID, QNAME_TAG_ARGUMENT, QNAME_TAG_ARRAYELEMENT, QNAME_TAG_CONTEXT, QNAME_TAG_DS_BINDING, QNAME_TAG_DS_BINDING_MAP, QNAME_TAG_JOURNAL, QNAME_TAG_JOURNAL_ENTRY, QNAME_TAG_MULTI_VALUE_MAP, QNAME_TAG_MULTI_VALUE_MAP_KEY, QNAME_TAG_MULTI_VALUE_MAP_VALUE, QNAME_TAG_NOOP, QNAME_TAG_NOW, QNAME_TAG_PASSWORD, SYSTEM_PROPERTY_PREFIX, TIMESTAMP_FORMAT, VALUE_FALSE, VALUE_JOURNAL_MODE_NORMAL, VALUE_JOURNAL_MODE_RECOVER, VALUE_RECOVERY_LOG_LEVEL_HIGH, VALUE_RECOVERY_LOG_LEVEL_LOW, VALUE_RECOVERY_LOG_LEVEL_MEDIUM, VALUE_TRUE

Constructor Summary

protected

JournalReader(Map<String,String> parameters, String role, JournalRecoveryLog recoveryLog, ServerInterface server) Concrete sub-classes must implement this constructor.

Method Summary

protected void	checkRepositoryHash(String hash) Compare the repository hash from the journal file with the current hash obtained from the server.
static JournalReader	getInstance(Map<String,String> parameters, String role, JournalRecoveryLog recoveryLog, ServerInterface server) Create an instance of the proper JournalReader child class, as determined by the server parameters.
abstract ConsumerJournalEntry	readJournalEntry() Concrete sub-classes should insure that their XMLEventReader is positioned at the beginning of a JournalEntry, and call readJournalEntry(XMLEventReader).
protected ConsumerJournalEntry	readJournalEntry(XMLEventReader reader) Read a JournalEntry from the journal, to produce a ConsumerJournalEntry instance.
abstract void	shutdown() Concrete sub-classes should probably synchronize this method, since it can be called either from the JournalConsumerThread or from the Server.

Methods inherited from class org.fcrepo.server.journal.xmlhelpers.AbstractXmlReader

advancePastWhitespace, getNotCharactersException, getNotEndTagException, getNotNextMemberOrEndOfGroupException, getNotStartTagException, getOptionalAttributeValue, getRequiredAttributeValue, isEndTagEvent, isStartTagEvent, readCharactersUntilEndTag, readStartTag

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

parameters

protected final Map<String,String> parameters

role

protected final String role

recoveryLog

protected final JournalRecoveryLog recoveryLog

server

protected final ServerInterface server

Constructor Detail

JournalReader

protected JournalReader(Map<String,String> parameters,
                        String role,
                        JournalRecoveryLog recoveryLog,
                        ServerInterface server)
                 throws JournalException

Concrete sub-classes must implement this constructor.

Throws:

JournalException

Method Detail

getInstance

public static JournalReader getInstance(Map<String,String> parameters,
                                        String role,
                                        JournalRecoveryLog recoveryLog,
                                        ServerInterface server)
                                 throws ModuleInitializationException

Create an instance of the proper JournalReader child class, as determined by the server parameters.

Throws:

ModuleInitializationException

shutdown

public abstract void shutdown()
                       throws JournalException

Concrete sub-classes should probably synchronize this method, since it can be called either from the JournalConsumerThread or from the Server.

Throws:

JournalException

readJournalEntry

public abstract ConsumerJournalEntry readJournalEntry()
                                               throws JournalException,
                                                      XMLStreamException

Concrete sub-classes should insure that their XMLEventReader is positioned at the beginning of a JournalEntry, and call readJournalEntry(XMLEventReader). It is likely that this method should be synchronized also, since it could be called from JournalConsumerThread when the server calls shutdown()

Throws:

JournalException

XMLStreamException

checkRepositoryHash

protected void checkRepositoryHash(String hash)
                            throws JournalException

Compare the repository hash from the journal file with the current hash obtained from the server. If they do not match, either throw an exception or simply log it, depending on the parameters. This method must not be called before the server has completed initialization. That's the only way we can be confident that the DOManager is present, and ready to create the repository has that we will compare to.

Throws:

JournalException

readJournalEntry

protected ConsumerJournalEntry readJournalEntry(XMLEventReader reader)
                                         throws JournalException,
                                                XMLStreamException

Read a JournalEntry from the journal, to produce a ConsumerJournalEntry instance. Concrete sub-classes should insure that the XMLEventReader is positioned at the beginning of a JournalEntry before calling this method.

Throws:

JournalException

XMLStreamException