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## org.jbpm.bpmn2.handler
Class LoggingTaskHandlerDecorator

    java.lang.Object
      org.jbpm.bpmn2.handler.AbstractExceptionHandlingTaskHandler
          org.jbpm.bpmn2.handler.LoggingTaskHandlerDecorator

All Implemented Interfaces:
  WorkItemHandler

    public class LoggingTaskHandlerDecorator

extends AbstractExceptionHandlingTaskHandler

This class is a `WorkItemHandler` implementation that is meant to wrap other `WorkItemHandler` implementations.

When an exception is thrown by the wrapped `WorkItemHandler` instance, it's added to a list of `LoggingTaskHandlerDecorator.WorkItemExceptionInfo` instances that contain as much information as possible about the exception, the `WorkItem` that caused the exception and the `ProcessInstance` id of the process in which the exception was thrown.

- See the `LoggingTaskHandlerDecorator.WorkItemExceptionInfo` class for more information.
- The list of `LoggingTaskHandlerDecorator.WorkItemExceptionInfo` classes is available via the `getWorkItemExceptionInfoList()` method.

After the exception info has been saved, this class then logs a message the appropriate information via `Logger.warn(String)`. The message logged is configurable: see `setLoggedMessageFormat(String)` for more information. This class is thread-safe, although it does not take any responsibility for the `WorkItemHandler` that it wraps. If you are using this with multiple threads, please make sure the the `WorkItemHandler` instance wrapped is also thread-safe.

Nested Class Summary
`static class` | `LoggingTaskHandlerDecorator.InputParameter` Type of input parameter that will be used in the `MessageFormat` string set in `setLoggedMessageFormat(String)`.
`class` | `LoggingTaskHandlerDecorator.WorkItemExceptionInfo`

Constructor Summary
`LoggingTaskHandlerDecorator(Class<? extends WorkItemHandler> originalTaskHandlerClass)` Constructs an `LoggingTaskHandlerDecorator` instance that wraps a created instance of the `WorkItemHandler` class given.
`LoggingTaskHandlerDecorator(Class<? extends WorkItemHandler> originalTaskHandlerClass, int logLimit)` Constructs an `LoggingTaskHandlerDecorator` instance that wraps a created instance of the `WorkItemHandler` class given.
`LoggingTaskHandlerDecorator(WorkItemHandler originalTaskHandler)` Constructs a `LoggingTaskHandlerDecorator` instance that wraps the given `WorkItemHandler` instance.

Method Summary
`List<LoggingTaskHandlerDecorator.WorkItemExceptionInfo>` | `getWorkItemExceptionInfoList()`
`void` | `handleAbortException(Throwable cause, WorkItem workItem, WorkItemManager manager)`
`void` | `handleExecuteException(Throwable cause, WorkItem workItem, WorkItemManager manager)`
`void` | `setLoggedExceptionInfoListSize(int loggedExceptionInfoListSize)`
`void` | `setLoggedMessageFormat(String logMessageFormat)` Sets the `MessageFormat` string to be used to format the log messages.
`void` | `setLoggedMessageInput(List<LoggingTaskHandlerDecorator.InputParameter> inputParameterList)` Sets the list of parameter types used for the log message format that is set in `setLoggedMessageFormat(String)`.
`void` | `setPrintStackTrace(boolean printStackTrace)`

Methods inherited from class org.jbpm.bpmn2.handler.AbstractExceptionHandlingTaskHandler
`abortWorkItem, executeWorkItem, getOriginalTaskHandler`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### LoggingTaskHandlerDecorator

    public LoggingTaskHandlerDecorator(Class<? extends WorkItemHandler> originalTaskHandlerClass,
                                       int logLimit)

  Constructs an `LoggingTaskHandlerDecorator` instance that wraps a created instance of the `WorkItemHandler` class given. This instance will only keep the given number of `LoggingTaskHandlerDecorator.WorkItemExceptionInfo` instances instead of the default 100.

  Parameters:
    `originalTaskHandlerClass` -
    `logLimit` -

### LoggingTaskHandlerDecorator

    public LoggingTaskHandlerDecorator(Class<? extends WorkItemHandler> originalTaskHandlerClass)

  Constructs an `LoggingTaskHandlerDecorator` instance that wraps a created instance of the `WorkItemHandler` class given. Only information about the last 100 exceptions will be held in the list available from `getWorkItemExceptionInfoList()`;

  Parameters:
    `originalTaskHandlerClass` -

### LoggingTaskHandlerDecorator

    public LoggingTaskHandlerDecorator(WorkItemHandler originalTaskHandler)

  Constructs a `LoggingTaskHandlerDecorator` instance that wraps the given `WorkItemHandler` instance. This instance will only keep a refere

  Parameters:
    `originalTaskHandler` -

Method Detail

### setLoggedMessageFormat

    public void setLoggedMessageFormat(String logMessageFormat)

  Sets the `MessageFormat` string to be used to format the log messages. If this method is used, it's a good idea to also use the `setLoggedMessageInput(List)` method. The default `MessageFormat` string used is one of the following: If the `WorkItemHandler` is a `ServiceTaskHandler` (that is used with `<serviceTask>` nodes), then the format is:
  `{0}.{1} threw {2} when {3}ing work item {4} in process instance {5}.`
  0. The name of the interface used for the <serviceTask>
  1. The name of the operation used for the <serviceTask>
  2. The simple name of the class of the exception thrown
  3. "excut" or "abort" depending on the WorkItemHandler method called
  4. The work item id
  5. The process instance id
  For all other `WorkItemHandler` implementations, the format is:
  `{0} thrown when work item {1} ({2}) was {3}ed in process instance {4}.`
  where the parameters are the following:
  0. The (simple) class name of the exception
  1. The work item id
  2. The name of the work item
  3. "excut" or "abort" depending on the WorkItemHandler method called
  4. The process instance id

  Parameters:
    `logMessageFormat` - The format to use for logged messages.

### setLoggedMessageInput

    public void setLoggedMessageInput(List<LoggingTaskHandlerDecorator.InputParameter> inputParameterList)

  Sets the list of parameter types used for the log message format that is set in `setLoggedMessageFormat(String)`. The order of the `LoggingTaskHandlerDecorator.InputParameter` value in the list corresponds to the `MessageFormat` number used in the String given to `setLoggedMessageFormat(String)`. See `LoggingTaskHandlerDecorator.InputParameter` for more information.

  Parameters:
    `inputParameterList` -

### setLoggedExceptionInfoListSize

    public void setLoggedExceptionInfoListSize(int loggedExceptionInfoListSize)

### setPrintStackTrace

    public void setPrintStackTrace(boolean printStackTrace)

### getWorkItemExceptionInfoList

    public List<LoggingTaskHandlerDecorator.WorkItemExceptionInfo> getWorkItemExceptionInfoList()

### handleExecuteException

    public void handleExecuteException(Throwable cause,
                                       WorkItem workItem,
                                       WorkItemManager manager)

  Specified by:
    `handleExecuteException` in class `AbstractExceptionHandlingTaskHandler`

### handleAbortException

    public void handleAbortException(Throwable cause,
                                     WorkItem workItem,
                                     WorkItemManager manager)

  Specified by:
    `handleAbortException` in class `AbstractExceptionHandlingTaskHandler`

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