Technical Specification
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Overview
This technical specification page will detail four areas of work to complete the Status Update change:
- The new classes required
- How to provide fixed log messages
- The additions to existing classes
- The deletions from existing classes
New classes
The new classes required draws on the design work already completed. The abstraction layer will be the new code created as part of this work. This can be split in to Interfaces and Classes.
Interface list
These interfaces form the abstraction layer.
Interface | Description |
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LogActor | Actor that will perform the logging. |
LogSubject | Subject of the logging . |
LogMessage | Factory to generate LogMessages. |
RootMessageLogger | Root logger that performs logging. |
RawMessageLogger | Wrapper for object that actually performs the logging. |
Class List
Implementation of the Actors
Class | Description |
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AMQPActor | Responsible for providing data about the Connection when logging. |
ManagementActor | Responsible for providing data about the Management Connection when logging. |
Implementation of the LogSubject
Each of these LogSubjects will ensure they toString according to the format design.
Class | Description |
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ConnectionLogSubject | Logger responsible for the Connection format. |
ChannelLogSubject | Logger responsible for the Channel format. |
QueueLogSubject | Logger responsible for the Queue format. |
ExchangeLogSubject | Logger responsible for the Exchange format. |
BindingLogSubject | Logger responsible for the Binding format. |
SubscriptionLogSubject | Logger responsible for the subscription format. |
MessageStoreLogSubject | Logger responsible for the MessageStore format. |
RootMessageLoggerImpl | Base logger that performs the final message formatting before logging. |
LogMessageFactoryImpl | Factory to create the LogMessages. |
Logging
Class | Description |
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Log4jRawMessageLogger | Wrapper to use log4j as the output mechanism. |
TestRawMessageLogger | Wrapper that provides an inspectable log for testing. |
Log Messages
Class | Description |
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BrokerLogMessages | A static class that contains accessors to the various parametrised log messages. |
Psuedo-Code Example
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// logActor is retreived from the ThreadLocal // a logMessage of type logMessage (with parms) is then requested for the specified subject. logActor.logMessage(logSubject, LogMessage(parms)) ... instance of LogActor{ RootLogger logger = ...getRootLogger();L public void logMessage(LogSubject subject, LogMessage message) { if (logger.isMessageEnabled(this, subject) { // FormatMessage in to : // MESSAGE [ this.toString() ] [ subject.toString() ] <messageID> : <message value> logger.logMessage(FormatMessage(this, subject, message)); } } } |
How to provide fixed log messages
The design calls for providing a fixed method of accessing the messages. Such as the following
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String version="0.6"; int build=794277; String message = BrokerLogMessages.BRK-1001(version, build); |
The value of message above would be
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BRK-1001 : Startup : Version: 0.6 Build: 794277 |
This can be done easily with the use of a MessageFormatter and a property file.
Code Block |
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BRK-1001 = Startup : Version {0} Build: {1} |
Initially the BrokerLogMessages class could be hand coded but in a future iteration it could be generated based on the content of the property file.
Additions to existing classes
The following classes will have logging added to provide the required log messages specified in the Functional Specification.
Main
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BRK-1001 : Startup : Version: <Version> Build: <Build> BRK-1004 : Ready BRK-1007 : Using logging configuration : <path> |
ApplicationRegistry
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BRK-1002 : Starting : Listening on <Transport> port <Port> BRK-1003 : Shuting down : <Transport> port <Port> BRK-1005 : Stopped |
ConfigurationFileApplicationRegistry
No Format |
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BRK-1006 : Using configuration : <path> |
JMXManagedObjectRegistry
No Format |
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MNG-1001 : Startup MNG-1002 : Starting : <service> : Listening on port <Port> MNG-1003 : Shuting down : <service> : port <Port> MNG-1004 : Ready MNG-1005 : Stopped MNG-1006 : Using SSL Keystore : <path> |
VirtualHost
No Format |
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VHT-1001 : Created : <name> VHT-1002 : Closed |
DerbyMessageStore/MemoryMessageStore
No Format |
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MST-1001 : Created : <name> MST-1003 : Closed |
DerbyMessageStore
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MST-1002 : Store location : <path> MST-1004 : Recovery Start [: <queue.name>] MST-1005 : Recovered <count> messages for queue <queue.name> MST-1006 : Recovery Complete [: <queue.name>] |
AMQMinaProtocolSession
No Format |
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CON-1001 : Open : Client ID <id> : Protocol Version : <version> CON-1002 : Close |
AMQChannel
No Format |
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CHN-1001 : Create : Prefetch <count> CHN-1002 : Flow <value> CHN-1003 : Close |
QueueRegistry
No Format |
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QUE-1001 : Create : [AutoDelete] [Durable|Transient] [Priority:<levels>] Owner:<name> QUE-1002 : Deleted |
AbstractExchange
No Format |
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EXH-1001 : Create : [Durable] Type:<value> Name:<value> EXH-1002 : Deleted |
ExchangeBindings
No Format |
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BND-1001 : Create [: Arguments : <key=value>] BND-1002 : Deleted |
SubscriptionImpl
No Format |
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SUB-1001 : Create : [Durable] [Arguments : <key=value>] SUB-1002 : Close |
Deletions from existing classes
The following log statements should be removed from the broker packages as they are being replaced with a new message.
AMQMinaProtocolSession
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_logger.info("Channel[" + channelId + "] awaiting closure - processing close-ok"); _logger.info("Closing channel due to: " + e.getMessage()); _logger.info("Closing connection due to: " + e.getMessage()); _logger.info("Closing connection due to: " + e.getMessage()); _logger.debug("REALLY Closing protocol session:" + _minaProtocolSession); |
AMQPFastProtocolHandler
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_logger.info("Protocol session created for:" + protocolSession.getRemoteAddress()); _logger.info("Session opened for:" + protocolSession.getRemoteAddress()); _logger.info("Protocol Session closed for:" + protocolSession.getRemoteAddress()); _logger.debug("AMQPFastProtocolHandler created"); |
BasicConsumeMethodHandler
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_logger.debug("BasicConsume: from '" + body.getQueue() + _logger.debug("No queue for '" + body.getQueue() + "'"); _logger.debug("Closing connection due to invalid selector"); |
ChannelFlowHandler.java:
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_logger.debug("Channel.Flow for channel " + channelId + ", active=" + body.getActive()); |
Configuration
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_devlog.info("Configuring logger using configuration file " + logConfigFile.getAbsolutePath()); _devlog.info("log file " + logConfigFile.getAbsolutePath() + " will be checked for changes every _devlog.debug("Using configuration file " + _configFile.getAbsolutePath()); ex.getMessage()); |
ConnectionCloseMethodHandler
No Format |
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_logger.info("ConnectionClose received with reply code/reply text " + body.getReplyText() + " for " + session); |
DerbyMessageStore
No Format |
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_logger.info("Configuring Derby message store for virtual host " + virtualHost.getName()); _logger.info("Recovering persistent state..."); _logger.info("Persistent state recovered successfully"); _logger.info("Recovering durable exchange " + exchange.getName() + " of type " + exchange.getType() + "..."); _logger.info("Restoring binding: (Exchange: " + exchange.getName() + ", Queue: " + queueName _logger.info("Recovered message counts: " + queueRecoveries); _logger.debug("public void createQueue(AMQQueue queue = " + queue + "): called"); _logger.debug("public void removeQueue(AMQShortString name = " + name + "): called"); _logger.debug("On recovery, delivering " + message.getMessageId() + " to " + queue.getName()); |
HeadersExchange
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_logger.debug("Exchange " + getName() + ": Unbinding " + queue.getName()); _logger.debug("Exchange " + getName() + ": routing message with headers " + headers); |
JMXManagedObjectRegistry
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log.info("Initialising managed object registry using platform MBean server"); _log.info("JMX ConnectorServer using SSL keystore file " + ksf.getAbsolutePath()); _startupLog.info("JMX ConnectorServer using SSL keystore file " + ksf.getAbsolutePath()); |
Main
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_brokerLogger.info("Starting Qpid Broker " + QpidProperties.getReleaseVersion() _brokerLogger.info("Qpid.AMQP listening on non-SSL address " + bindAddress); _brokerLogger.info("Qpid.AMQP listening on SSL port " + config.getSSLPort()); _brokerLogger.info("Qpid Broker Ready :" + QpidProperties.getReleaseVersion() |
MemoryMessageStore
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_log.info("Using capacity " + DEFAULT_HASHTABLE_CAPACITY + " for hash tables"); _log.info("Using capacity " + hashtableCapacity + " for hash tables"); |
QueueBindHandler
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_log.info("Binding queue " + queue + " to exchange " + exch + " with routing key " + routingKey); |
QueueDeclareHandler
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_logger.info("Queue " + queueName + " bound to default exchange(" + defaultExchange.getName() + ")"); _logger.info("Queue " + queueName + " declared successfully"); |
QueueUnbindHandler
No Format |
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_log.info("Binding queue " + queue + " to exchange " + exch + " with routing key " + routingKey); |
SimpleAMQQueue
No Format |
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_logger.info("Auto-deleteing queue:" + this); |
SubscriptionImpl
No Format |
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_logger.info("Closing subscription (" + debugIdentity() + "):" + this); |
VirtualHost
No Format |
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_logger.info("Binding queue:" + queue + " with routing key '" + routingKey + "' to exchange:" + this); _logger.debug("Loading configuration for virtualhost: " + config.getName()); |
Feedback
ID | From | Comment | Response |
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1 | Marnie | Ensure data logged in messaged due to be deleted is not lost. |
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2 | Marnie | Following 1: Exception handling messages need further thought as replacing with 'Close' messages loses the cause |
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3 | Marnie | Be mindful of performance in generating these log messages |
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4 | Marnie | It is not clear that the LogActors, LogSubjects will be created and attached to their repective model objects |
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