edu.rice.cs.drjava.model.repl
Class InteractionsModel

java.lang.Object
  edu.rice.cs.drjava.model.repl.InteractionsModel

All Implemented Interfaces:

InteractionsModelCallback

Direct Known Subclasses:

InteractionsModelTest.TestInteractionsModel, RMIInteractionsModel, SimpleInteractionsModel

public abstract class InteractionsModel
extends Object
implements InteractionsModelCallback

A Swing specific model for the DrJava InteractionsPane. It glues together an InteractionsDocument, an InteractionsPane and a JavaInterpreter. This abstract class provides common functionality for all such models. The methods in this class generally can be executed only in the event thread once the model has been constructed.

Version:

$Id: InteractionsModel.java 5237 2010-04-27 07:52:59Z mgricken $

Nested Class Summary

private static class

InteractionsModel.NoInputListener Singleton InputListener which should never be asked for input.

Field Summary

protected HashSet<String>	_autoImportSet Set of classes or packages to import again when a breakpoint is hit.
private String	_banner Banner displayed at top of the interactions document
protected ConsoleDocumentInterface	_cDoc The embedded interactions document (a SwingDocument in native DrJava)
private int	_debugPort Port used by the debugger to connect to the Interactions JVM.
private boolean	_debugPortSet Whether the debug port has already been set.
protected InteractionsDocument	_document InteractionsDocument containing the commands and history.
protected InputListener	_inputListener The input listener to listen for requests to System.in.
protected String	_lastError Last error, or null if successful.
protected InteractionsEventNotifier	_notifier Keeps track of any listeners to the model.
InteractionsPane	_pane The interactions pane bundled with this document.
protected String	_secondToLastError
private String	_toAddToHistory The String added to history when the interaction is complete or an error is thrown
protected boolean	_waitingForFirstInterpreter Whether we are waiting for the interpreter to register for the first time.
protected File	_workingDirectory The working directory for the current interpreter.
private int	_writeDelay Number of milliseconds to wait after each println, to prevent the JVM from being flooded with print calls.
Object	_writerLock A lock object to prevent print calls to System.out or System.err from flooding the JVM, ensuring the UI remains responsive.
static String	BANNER_PREFIX Banner prefix.
private static int	DELAY_INTERVAL
private int	delayCount
static int	WRITE_DELAY Number of milliseconds to wait after each println, to prevent the JVM from being flooded with print calls.

Constructor Summary

InteractionsModel(ConsoleDocumentInterface cDoc, File wd, int historySize, int writeDelay)
Constructs an InteractionsModel.

Method Summary

void	_addNewline() Appends a newLine to _document assuming that the Write Lock is already held.
protected void	_createNewDebugPort() Generates an available port for use with the debugger.
protected static ArrayList<String>	_getHistoryText(FileOpenSelector selector) Opens the files chosen in the given file selector, and returns an ArrayList with one history string for each selected file.
void	_interactionIsOver() Performs the common behavior when an interaction ends.
protected abstract void	_interpret(String toEval) Interprets the given command.
protected abstract void	_interpreterResetFailed(Throwable t) Any extra action to perform (beyond notifying listeners) when the interpreter fails to reset.
protected abstract void	_interpreterWontStart(Exception e) Action to perform when the interpreter won't start.
protected abstract void	_notifyInteractionEnded() Notifies listeners that an interaction has ended.
protected abstract void	_notifyInteractionIncomplete() Notifies the view that the current interaction is incomplete.
abstract void	_notifyInteractionStarted() Notifies listeners that an interaction has started.
protected abstract void	_notifyInterpreterExited(int status) Notifies listeners that the interpreter has exited unexpectedly.
abstract void	_notifyInterpreterReady(File wd) Notifies listeners that the interpreter is ready.
protected abstract void	_notifyInterpreterResetFailed(Throwable t) Notifies listeners that the interpreter reset failed.
protected abstract void	_notifyInterpreterResetting() Notifies listeners that the interpreter is resetting.
protected abstract void	_notifySyntaxErrorOccurred(int offset, int length) Handles a syntax error being returned from an interaction
private void	_prepareToInterpret(String text) Performs pre-interpretation preparation of the interactions document and notifies the view.
protected static ArrayList<String>	_removeSeparators(String text) Removes the interaction-separator comments from a history, so that they will not appear when executing the history.
protected abstract void	_resetInterpreter(File wd, boolean force) Resets the Java interpreter.
void	_writerDelay() Waits for a small amount of time on a shared writer lock.
abstract void	addBuildDirectoryClassPath(File f) These add the given path to the build directory classpaths used in the interpreter.
abstract void	addExternalFilesClassPath(File f) These add the given path to the external files classpaths used in the interpreter.
abstract void	addExtraClassPath(File f) These add the given path to the extra classpaths used in the interpreter.
void	addListener(InteractionsListener listener) Adds an InteractionsListener to the model.
abstract void	addProjectClassPath(File f) These add the given path to the classpaths used in the interpreter.
abstract void	addProjectFilesClassPath(File f) These add the given path to the project files classpaths used in the interpreter.
void	append(String s, String styleName) Appends a string to the given document using a named style.
void	autoImport() Executes import statements for the classes and packages in the auto-import set.
void	changeInputListener(InputListener oldListener, InputListener newListener) Changes the input listener.
private String	generateBanner(File wd)
String	getBanner()
static String	getBanner(File wd)
abstract ConsoleDocument	getConsoleDocument() Gets the console tab document for this interactions model
String	getConsoleInput() Returns a line of text entered by the user at the equivalent of System.in.
int	getDebugPort() Returns the port number to use for debugging the interactions JVM.
InteractionsDocument	getDocument() Returns the InteractionsDocument stored by this model.
String	getLastError() Return the last error, or null if successful.
String	getSecondToLastError() Return the second to last error, or null if successful.
String	getStartUpBanner()
abstract Pair<String,String>	getVariableToString(String var) Gets the string representation of the value of a variable in the current interpreter.
File	getWorkingDirectory() Returns the working directory for the current interpreter.
void	interactionContinues()
void	interpret(String toEval) Interprets the given command.
void	interpretCurrentInteraction() Interprets the current given text at the prompt in the interactions doc.
void	interpreterReady(File wd) Called when a new Java interpreter has registered and is ready for use.
void	interpreterResetFailed(Throwable t) This method is called by the Main JVM if the Interpreter JVM cannot be exited
void	interpreterResetting() Called when the interpreter starts to reset.
void	interpreterWontStart(Exception e) Called when the slave JVM fails to startup
void	loadHistory(FileOpenSelector selector) Interprets the files selected in the FileOpenSelector.
InteractionsScriptModel	loadHistoryAsScript(FileOpenSelector selector)
void	performDefaultImports() Perform the default imports of the classes and packages listed in the INTERACTIONS_AUTO_IMPORT_CLASSES.
void	removeAllInteractionListeners() Removes all InteractionsListeners from this model.
String	removeLastFromHistory() Returns the last history item and then removes it, or returns null if the history is empty.
void	removeListener(InteractionsListener listener) Removea an InteractionsListener from the model.
StackTraceElement[]	replaceLLException(StackTraceElement[] sT) Default behavior set to return what it's given.
void	replCalledSystemExit(int status) Signifies that the most recent interpretation contained a call to System.exit.
void	replReturnedResult(String result, String style) Appends the returned result to the interactions document, inserts a prompt in the interactions document, and advances the caret in the interactions pane.
void	replReturnedSyntaxError(String errorMessage, String interaction, int startRow, int startCol, int endRow, int endCol) Signifies that the most recent interpretation was preempted by a syntax error.
void	replReturnedVoid() Signifies that the most recent interpretation completed successfully, returning no value.
void	replSystemErrPrint(String s) Called when the repl prints to System.err.
void	replSystemOutPrint(String s) Called when the repl prints to System.out.
void	replThrewException(String message) Signifies that the most recent interpretation was ended due to an exception being thrown.
void	replThrewException(String message, StackTraceElement[] stackTrace) Signifies that the most recent interpretation was ended due to an exception being thrown.
void	resetInterpreter(File wd, boolean force) Resets the Java interpreter with working directory wd.
void	resetLastErrors() Reset the information about the last and second to last error.
protected void	scrollToCaret()
void	setDebugPort(int port) Sets the port number to use for debugging the interactions JVM.
void	setInputListener(InputListener listener) Sets the listener for any type of single-source input event.
void	setUpPane(InteractionsPane pane) Sets the _pane field and initializes the caret position in the pane.
void	setWaitingForFirstInterpreter(boolean waiting) Sets this model's notion of whether it is waiting for the first interpreter to connect.

Methods inherited from class java.lang.Object

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

Methods inherited from interface edu.rice.cs.drjava.model.repl.InteractionsModelCallback

getCompilerBootClassPath, transformCommands

Field Detail

BANNER_PREFIX

public static final String BANNER_PREFIX

Banner prefix.

See Also:

Constant Field Values

WRITE_DELAY

public static final int WRITE_DELAY

Number of milliseconds to wait after each println, to prevent the JVM from being flooded with print calls.

See Also:

Constant Field Values

_notifier

protected final InteractionsEventNotifier _notifier

Keeps track of any listeners to the model.

_document

protected volatile InteractionsDocument _document

InteractionsDocument containing the commands and history. This field is volatile rather than final because its initialization is deferred until after the interactions pane is created. The InteractionsDocument constructor indirectly accesses the pane generating a NullPointerException if _pane is uninitialized.

_waitingForFirstInterpreter

protected volatile boolean _waitingForFirstInterpreter

Whether we are waiting for the interpreter to register for the first time.

_workingDirectory

protected volatile File _workingDirectory

The working directory for the current interpreter.

_writerLock

public final Object _writerLock

A lock object to prevent print calls to System.out or System.err from flooding the JVM, ensuring the UI remains responsive. Only public for testing purposes.

_writeDelay

private final int _writeDelay

Number of milliseconds to wait after each println, to prevent the JVM from being flooded with print calls.

_debugPort

private volatile int _debugPort

Port used by the debugger to connect to the Interactions JVM. Uniquely created in getDebugPort().

_debugPortSet

private volatile boolean _debugPortSet

Whether the debug port has already been set. If not, calling getDebugPort will generate an available port.

_toAddToHistory

private volatile String _toAddToHistory

The String added to history when the interaction is complete or an error is thrown

_inputListener

protected volatile InputListener _inputListener

The input listener to listen for requests to System.in.

_cDoc

protected final ConsoleDocumentInterface _cDoc

The embedded interactions document (a SwingDocument in native DrJava)

_pane

public volatile InteractionsPane _pane

The interactions pane bundled with this document. In contrast to a standard MVC decomposition, where the model and the view are independent components, an interactions model inherently includes a prompt and a cursor marking where the next input expression (in progress) begins and where the cursor is within that expression. In Swing, the view contains the cursor. Our InteractionsDocument (a form of ConsoleDocument) contains the prompt. Public only for testing purposes; otherwise protected. TODO: The Eclipse plug-in doesn't use Swing, and so has no InteractionsPane. In that case, _pane is always null. This should be redesigned to eliminate the strong coupling with Swing.

_banner

private volatile String _banner

Banner displayed at top of the interactions document

_lastError

protected volatile String _lastError

Last error, or null if successful.

_secondToLastError

protected volatile String _secondToLastError

_autoImportSet

protected final HashSet<String> _autoImportSet

Set of classes or packages to import again when a breakpoint is hit.

DELAY_INTERVAL

private static final int DELAY_INTERVAL

See Also:

Constant Field Values

delayCount

private volatile int delayCount

Constructor Detail

InteractionsModel

public InteractionsModel(ConsoleDocumentInterface cDoc,
                         File wd,
                         int historySize,
                         int writeDelay)

Constructs an InteractionsModel. The InteractionsPane is created later by the InteractionsController. As a result, the posting of a banner at the top of InteractionsDocument must be deferred until after the InteracationsPane has been set up.

Parameters:

cDoc - document to use in the InteractionsDocument

wd - Working directory for the interpreter

historySize - Number of lines to store in the history

writeDelay - Number of milliseconds to wait after each println

Method Detail

setUpPane

public void setUpPane(InteractionsPane pane)

Sets the _pane field and initializes the caret position in the pane. Called in the InteractionsController.

addListener

public void addListener(InteractionsListener listener)

Adds an InteractionsListener to the model.

Parameters:

listener - a listener that reacts to Interactions events.

removeListener

public void removeListener(InteractionsListener listener)

Removea an InteractionsListener from the model. If the listener is not currently listening to this model, this method has no effect.

Parameters:

listener - a listener that reacts to Interactions events

removeAllInteractionListeners

public void removeAllInteractionListeners()

Removes all InteractionsListeners from this model.

getDocument

public InteractionsDocument getDocument()

Returns the InteractionsDocument stored by this model.

interactionContinues

public void interactionContinues()

setWaitingForFirstInterpreter

public void setWaitingForFirstInterpreter(boolean waiting)

Sets this model's notion of whether it is waiting for the first interpreter to connect. The interactionsReady event is not fired for the first interpreter.

interpretCurrentInteraction

public void interpretCurrentInteraction()

Interprets the current given text at the prompt in the interactions doc. May run outside the event thread.

autoImport

public void autoImport()

Executes import statements for the classes and packages in the auto-import set.

_prepareToInterpret

private void _prepareToInterpret(String text)

Performs pre-interpretation preparation of the interactions document and notifies the view. Must run in the event thread for newline to be inserted at proper time. Assumes that Write Lock is already held.

_addNewline

public void _addNewline()

Appends a newLine to _document assuming that the Write Lock is already held. Must run in the event thread.

interpret

public final void interpret(String toEval)

Interprets the given command.

Parameters:

toEval - command to be evaluated.

_interpret

protected abstract void _interpret(String toEval)

Interprets the given command. This should only be called from interpret, never directly.

Parameters:

toEval - command to be evaluated

_notifyInteractionIncomplete

protected abstract void _notifyInteractionIncomplete()

Notifies the view that the current interaction is incomplete.

_notifyInteractionStarted

public abstract void _notifyInteractionStarted()

Notifies listeners that an interaction has started. (Subclasses must maintain listeners.)

getVariableToString

public abstract Pair<String,String> getVariableToString(String var)

Gets the string representation of the value of a variable in the current interpreter.

Parameters:

var - the name of the variable

Returns:

A string representation of the value, or null if the variable is not defined.

resetInterpreter

public final void resetInterpreter(File wd,
                                   boolean force)

Resets the Java interpreter with working directory wd.

_resetInterpreter

protected abstract void _resetInterpreter(File wd,
                                          boolean force)

Resets the Java interpreter. This should only be called from resetInterpreter, never directly.

getWorkingDirectory

public File getWorkingDirectory()

Returns the working directory for the current interpreter.

addProjectClassPath

public abstract void addProjectClassPath(File f)

These add the given path to the classpaths used in the interpreter.

Parameters:

f - the path to add

addBuildDirectoryClassPath

public abstract void addBuildDirectoryClassPath(File f)

These add the given path to the build directory classpaths used in the interpreter.

Parameters:

f - the path to add

addProjectFilesClassPath

public abstract void addProjectFilesClassPath(File f)

These add the given path to the project files classpaths used in the interpreter.

Parameters:

f - the path to add

addExternalFilesClassPath

public abstract void addExternalFilesClassPath(File f)

These add the given path to the external files classpaths used in the interpreter.

Parameters:

f - the path to add

addExtraClassPath

public abstract void addExtraClassPath(File f)

These add the given path to the extra classpaths used in the interpreter.

Parameters:

f - the path to add

_notifySyntaxErrorOccurred

protected abstract void _notifySyntaxErrorOccurred(int offset,
                                                   int length)

Handles a syntax error being returned from an interaction

Parameters:

offset - the first character of the error in the InteractionsDocument

length - the length of the error.

loadHistory

public void loadHistory(FileOpenSelector selector)
                 throws IOException

Interprets the files selected in the FileOpenSelector. Assumes all strings have no trailing whitespace. Interprets the array all at once so if there are any errors, none of the statements after the first erroneous one are processed. Only runs in the event thread.

Throws:

IOException

_getHistoryText

protected static ArrayList<String> _getHistoryText(FileOpenSelector selector)
                                            throws IOException,
                                                   OperationCanceledException

Opens the files chosen in the given file selector, and returns an ArrayList with one history string for each selected file.

Parameters:

selector - A file selector supporting multiple file selection

Returns:

a list of histories (one for each selected file)

Throws:

IOException

OperationCanceledException

loadHistoryAsScript

public InteractionsScriptModel loadHistoryAsScript(FileOpenSelector selector)
                                            throws IOException,
                                                   OperationCanceledException

Throws:

IOException

OperationCanceledException

_removeSeparators

protected static ArrayList<String> _removeSeparators(String text)

Removes the interaction-separator comments from a history, so that they will not appear when executing the history.

Parameters:

text - The full, formatted text of an interactions history (obtained from _getHistoryText)

Returns:

A list of strings representing each interaction in the history. If no separators are present, the entire history is treated as one interaction.

getDebugPort

public int getDebugPort()
                 throws IOException

Returns the port number to use for debugging the interactions JVM. Generates an available port if one has not been set manually.

Specified by:

getDebugPort in interface InteractionsModelCallback

Throws:

IOException - if unable to get a valid port number.

_createNewDebugPort

protected void _createNewDebugPort()
                            throws IOException

Generates an available port for use with the debugger.

Throws:

IOException - if unable to get a valid port number.

setDebugPort

public void setDebugPort(int port)

Sets the port number to use for debugging the interactions JVM.

Parameters:

port - Port to use to debug the interactions JVM

replSystemOutPrint

public void replSystemOutPrint(String s)

Called when the repl prints to System.out. Includes a delay to prevent flooding the interactions document. This method can safely be called from outside the event thread.

Specified by:

replSystemOutPrint in interface InteractionsModelCallback

Parameters:

s - String to print

replSystemErrPrint

public void replSystemErrPrint(String s)

Called when the repl prints to System.err. Includes a delay to prevent flooding the interactions document. This method can safely be called from outside the event thread.

Specified by:

replSystemErrPrint in interface InteractionsModelCallback

Parameters:

s - String to print

getConsoleInput

public String getConsoleInput()

Returns a line of text entered by the user at the equivalent of System.in. Only executes in the event thread.

Specified by:

getConsoleInput in interface InteractionsModelCallback

Returns:

the input given to System.in

setInputListener

public void setInputListener(InputListener listener)

Sets the listener for any type of single-source input event. The listener can only be changed with the changeInputListener method.except in testing code which needs to install a different listener after the interactiona controller has been created (method testConsoleInput in GlobalModelIOTest).

Specified by:

setInputListener in interface InteractionsModelCallback

Parameters:

listener - a listener that reacts to input requests

Throws:

IllegalStateException - if the input listener is locked

changeInputListener

public void changeInputListener(InputListener oldListener,
                                InputListener newListener)

Changes the input listener. Takes in the old listener to ensure that the owner of the original listener is aware that it is being changed. It is therefore important NOT to include a public accessor to the input listener on the model. Only used in a single thread in unit tests, so synchronization is unnecessary.

Specified by:

changeInputListener in interface InteractionsModelCallback

Parameters:

oldListener - the listener that was installed

newListener - the listener to be installed

_interactionIsOver

public void _interactionIsOver()

Performs the common behavior when an interaction ends. Subclasses might want to additionally notify listeners here. (Do this after calling super()). Access is public for testing purposes.

_notifyInteractionEnded

protected abstract void _notifyInteractionEnded()

Notifies listeners that an interaction has ended. (Subclasses must maintain listeners.)

append

public void append(String s,
                   String styleName)

Appends a string to the given document using a named style.

Parameters:

s - String to append to the end of the document

styleName - Name of the style to use for s

_writerDelay

public void _writerDelay()

Waits for a small amount of time on a shared writer lock.

replReturnedVoid

public void replReturnedVoid()

Signifies that the most recent interpretation completed successfully, returning no value.

Specified by:

replReturnedVoid in interface InteractionsModelCallback

replReturnedResult

public void replReturnedResult(String result,
                               String style)

Appends the returned result to the interactions document, inserts a prompt in the interactions document, and advances the caret in the interactions pane.

Specified by:

replReturnedResult in interface InteractionsModelCallback

Parameters:

result - The .toString-ed version of the value that was returned by the interpretation. We must return the String form because returning the Object directly would require the data type to be serializable.

replaceLLException

public StackTraceElement[] replaceLLException(StackTraceElement[] sT)

Default behavior set to return what it's given. Used to replace line number and file name in a throwable when the error occurs in a Language Level file. Overriden in DefaultInteractionModel when a GlobalModel is available to make a LanguageLevelStackTraceMapper.

Parameters:

sT - the stackTrace to replace line number and file name

Returns:

the same stackTrace.

replThrewException

public void replThrewException(String message,
                               StackTraceElement[] stackTrace)

Signifies that the most recent interpretation was ended due to an exception being thrown.

Specified by:

replThrewException in interface InteractionsModelCallback

Parameters:

message - The exception's message

replThrewException

public void replThrewException(String message)

Signifies that the most recent interpretation was ended due to an exception being thrown.

Specified by:

replThrewException in interface InteractionsModelCallback

Parameters:

message - The exception's message

replReturnedSyntaxError

public void replReturnedSyntaxError(String errorMessage,
                                    String interaction,
                                    int startRow,
                                    int startCol,
                                    int endRow,
                                    int endCol)

Signifies that the most recent interpretation was preempted by a syntax error. The integer parameters support future error highlighting.

Specified by:

replReturnedSyntaxError in interface InteractionsModelCallback

Parameters:

errorMessage - The syntax error message

startRow - The starting row of the error

startCol - The starting column of the error

endRow - The end row of the error param endCol The end column of the error

endCol - The end column of the error

replCalledSystemExit

public void replCalledSystemExit(int status)

Signifies that the most recent interpretation contained a call to System.exit.

Specified by:

replCalledSystemExit in interface InteractionsModelCallback

Parameters:

status - The exit status that will be returned.

_notifyInterpreterExited

protected abstract void _notifyInterpreterExited(int status)

Notifies listeners that the interpreter has exited unexpectedly. (Subclasses must maintain listeners.)

Parameters:

status - Status code of the dead process

interpreterResetting

public void interpreterResetting()

Called when the interpreter starts to reset.

Specified by:

interpreterResetting in interface InteractionsModelCallback

_notifyInterpreterResetting

protected abstract void _notifyInterpreterResetting()

Notifies listeners that the interpreter is resetting. (Subclasses must maintain listeners.)

interpreterResetFailed

public void interpreterResetFailed(Throwable t)

This method is called by the Main JVM if the Interpreter JVM cannot be exited

Specified by:

interpreterResetFailed in interface InteractionsModelCallback

Parameters:

t - The Throwable thrown by System.exit

interpreterWontStart

public void interpreterWontStart(Exception e)

Description copied from interface: InteractionsModelCallback

Called when the slave JVM fails to startup

Specified by:

interpreterWontStart in interface InteractionsModelCallback

_interpreterResetFailed

protected abstract void _interpreterResetFailed(Throwable t)

Any extra action to perform (beyond notifying listeners) when the interpreter fails to reset.

Parameters:

t - The Throwable thrown by System.exit

_notifyInterpreterResetFailed

protected abstract void _notifyInterpreterResetFailed(Throwable t)

Notifies listeners that the interpreter reset failed. (Subclasses must maintain listeners.)

Parameters:

t - Throwable explaining why the reset failed.

_interpreterWontStart

protected abstract void _interpreterWontStart(Exception e)

Action to perform when the interpreter won't start.

getBanner

public String getBanner()

getStartUpBanner

public String getStartUpBanner()

getBanner

public static String getBanner(File wd)

generateBanner

private String generateBanner(File wd)

scrollToCaret

protected void scrollToCaret()

interpreterReady

public void interpreterReady(File wd)

Called when a new Java interpreter has registered and is ready for use.

Specified by:

interpreterReady in interface InteractionsModelCallback

performDefaultImports

public void performDefaultImports()

Perform the default imports of the classes and packages listed in the INTERACTIONS_AUTO_IMPORT_CLASSES.

_notifyInterpreterReady

public abstract void _notifyInterpreterReady(File wd)

Notifies listeners that the interpreter is ready. (Subclasses must maintain listeners.)

getConsoleDocument

public abstract ConsoleDocument getConsoleDocument()

Gets the console tab document for this interactions model

getLastError

public String getLastError()

Return the last error, or null if successful.

getSecondToLastError

public String getSecondToLastError()

Return the second to last error, or null if successful.

resetLastErrors

public void resetLastErrors()

Reset the information about the last and second to last error.

removeLastFromHistory

public String removeLastFromHistory()

Returns the last history item and then removes it, or returns null if the history is empty.