/* Relation supporting message passing. Copyright (c) 1997-2014 The Regents of the University of California. All rights reserved. Permission is hereby granted, without written agreement and without license or royalty fees, to use, copy, modify, and distribute this software and its documentation for any purpose, provided that the above copyright notice and the following two paragraphs appear in all copies of this software. IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. PT_COPYRIGHT_VERSION_2 COPYRIGHTENDKEY */ package ptolemy.actor; import java.util.Collections; import java.util.Enumeration; import java.util.HashMap; import java.util.Iterator; import java.util.LinkedList; import java.util.List; import ptolemy.data.IntToken; import ptolemy.data.expr.Parameter; import ptolemy.data.type.BaseType; import ptolemy.kernel.ComponentRelation; import ptolemy.kernel.CompositeEntity; import ptolemy.kernel.Entity; import ptolemy.kernel.Port; import ptolemy.kernel.Relation; import ptolemy.kernel.util.Attribute; import ptolemy.kernel.util.IllegalActionException; import ptolemy.kernel.util.InternalErrorException; import ptolemy.kernel.util.InvalidStateException; import ptolemy.kernel.util.KernelException; import ptolemy.kernel.util.NameDuplicationException; import ptolemy.kernel.util.Nameable; import ptolemy.kernel.util.Settable; import ptolemy.kernel.util.Workspace; /////////////////////////////////////////////////////////////////// //// IORelation /** This class mediates connections between ports that can send data to one another via message passing. One purpose of this relation is to ensure that IOPorts are only connected to IOPorts. A second purpose is to support the notion of a width to represent something like a bus. By default an IORelation is a bus for which the width will be inferred, which corresponds to a width equal to Auto. In Vergil you can change the width from Auto to a specific value, to explicitly specify the width of a relation. Specifying a width equal to zero will disable the relation. A width equal equal to -1 is equivalent to a width equal to Auto, in which case the width will be inferred (if possible) from the context. In particular, if this relation is linked on the inside to a port with some width, then the width of this relation will be inferred to be the enough so that the widths of all inside linked relations adds up to the outside width of the port. If this IORelation is linked to another instance of IORelation, then the width of the two IORelations is constrained to be the same.
Instances of IORelation can only be linked to instances of IOPort or instances of IORelation. Derived classes may further constrain this to subclasses of IOPort of IORelation. Such derived classes should override the protected methods _checkPort() and _checkRelation() to throw an exception.
To link a IOPort to an IORelation, use the link() or liberalLink() method in the IOPort class. To remove a link, use the unlink() method. To link (unlink) an IORelation to an IORelation, use the link() (unlink()) method of IORelation.
The container for instances of this class can only be instances of CompositeActor. Derived classes may wish to further constrain the container to subclasses of ComponentEntity. To do this, they should override the _checkContainer() method. @author Edward A. Lee, Jie Liu, Contributor: Bert Rodiers @version $Id: IORelation.java 70402 2014-10-23 00:52:20Z cxh $ @since Ptolemy II 0.2 @Pt.ProposedRating Green (eal) @Pt.AcceptedRating Green (acataldo) */ public class IORelation extends ComponentRelation { /** Construct a relation in the default workspace with an empty string * as its name. Add the relation to the directory of the workspace. */ public IORelation() { super(); _init(); } /** Construct a relation in the specified workspace with an empty * string as a name. You can then change the name with setName(). * If the workspace argument is null, then use the default workspace. * Add the relation to the workspace directory. * * @param workspace The workspace that will list the relation. */ public IORelation(Workspace workspace) { super(workspace); _init(); } /** Construct a relation with the given name contained by the specified * entity. The container argument must not be null, or a * NullPointerException will be thrown. This relation will use the * workspace of the container for synchronization and version counts. * If the name argument is null, then the name is set to the empty string. * This constructor write-synchronizes on the workspace. * * @param container The container. * @param name The name of the relation. * @exception IllegalActionException If the container is incompatible * with this relation. * @exception NameDuplicationException If the name coincides with * a relation already in the container. */ public IORelation(CompositeEntity container, String name) throws IllegalActionException, NameDuplicationException { super(container, name); _init(); } /////////////////////////////////////////////////////////////////// //// parameters //// /** The width of this relation. This is an integer that defaults * to WIDTH_TO_INFER, which means that the width will be inferred. */ public Parameter width; /////////////////////////////////////////////////////////////////// //// public methods //// /** React to a change in an attribute. This method is called by * a contained attribute when its value changes. This overrides * the base class so that if the attribute is an instance of * Parameter and the name is "width", then the width of the Relation * is set. * @param attribute The attribute that changed. * @exception IllegalActionException If the change is not acceptable * to this container. */ @Override public void attributeChanged(Attribute attribute) throws IllegalActionException { if (attribute instanceof Parameter && "width".equals(attribute.getName())) { IntToken t = (IntToken) ((Parameter) attribute).getToken(); if (t != null) { int width = t.intValue(); _setWidth(width); } } } /** Clone the object into the specified workspace. The new object is * not added to the directory of that workspace (you must do this * yourself if you want it there). * The result is a new relation with no links and no container, but with * the same width as the original. * * @param workspace The workspace for the cloned object. * @exception CloneNotSupportedException If one or more of the attributes * cannot be cloned. * @return A new ComponentRelation. */ @Override public Object clone(Workspace workspace) throws CloneNotSupportedException { IORelation newObject = (IORelation) super.clone(workspace); newObject._inferredWidthVersion = -1; newObject._cachedWidth = -2; return newObject; } /** Return the receivers of all input ports linked to this * relation, directly or indirectly through a relation group, * except those in the port * given as an argument. The returned value is an array of * arrays. The first index (the row) specifies the group, where * a group receives the same data from a channel. * Each channel normally receives distinct data. The * second index (the column) specifies the receiver number within * the group of receivers that get copies from the same channel. *
* The number of groups (rows) is less than or equal to the * width of the relation, which is always at least one. If * there are no receivers then return null. *
* For each channel, there may be any number of receivers in the group. * The individual receivers are selected using the second index of the * returned array of arrays. If there are no receivers in the group, * then the channel is represented by null. I.e., if the returned * array of arrays is x and the channel number is c, * then x[c] is null. Otherwise, it is an array, where * the size of the array is the number of receivers in the group. *
* NOTE: This method may have the effect of creating new receivers in the * remote input ports and losing the previous receivers in those ports, * together with any data they may contain. This occurs only if the * topology has changed since the receivers were created, and that change * resulting in one of those ports not having the right number of * receivers. *
* This method read-synchronizes on the workspace.
*
* @see IOPort#getRemoteReceivers
* @param except The port to exclude, or null to not
* exclude any ports.
* @return The receivers associated with this relation.
* @exception IllegalActionException If throwen while determining the cascade.
* @exception InvalidStateException
*/
public Receiver[][] deepReceivers(IOPort except)
throws /*InvalidStateException,*/IllegalActionException {
try {
_workspace.getReadAccess();
Receiver[][] result = new Receiver[0][0];
Iterator> inputs = linkedDestinationPortList(except).iterator();
Receiver[][] receivers; //= new Receiver[0][0];
// NOTE: We have to be careful here to keep track of
// multiple occurrences of a port in this list.
// EAL 7/30/00.
HashMap
* The container must be an
* instance of CompositeActor or null, otherwise an exception is thrown.
* Derived classes may further constrain the class of the container
* to a subclass of CompositeActor.
*
* This method invalidates the schedule and resolved types of the
* director of the container, if there is one.
*
* This method is write-synchronized on the workspace.
*
* @param container The proposed container.
* @exception IllegalActionException If the container is not a
* CompositeActor or null, or this entity and the container are not in
* the same workspace.
* @exception NameDuplicationException If the name collides with a name
* already on the relations list of the container.
*/
@Override
public void setContainer(CompositeEntity container)
throws IllegalActionException, NameDuplicationException {
if (!(container instanceof CompositeActor) && container != null) {
throw new IllegalActionException(this, container,
"IORelation can only be contained by CompositeActor.");
}
// Invalidate schedule and type resolution of the old container.
Nameable oldContainer = getContainer();
if (oldContainer instanceof CompositeActor) {
Director director = ((CompositeActor) oldContainer).getDirector();
if (director != null) {
director.invalidateSchedule();
director.invalidateResolvedTypes();
}
}
// Invalidate schedule and type resolution of the new container.
// Either container == null or container instanceof CompositeActor == true
if (container != null) {
Director director = ((CompositeActor) container).getDirector();
if (director != null) {
director.invalidateSchedule();
director.invalidateResolvedTypes();
}
}
super.setContainer(container);
}
/** Set the width of this relation and all relations in its
* relation group. The width is the number of
* channels that the relation represents. If the argument
* is equal to WIDTH_TO_INFER, then the relation becomes a bus with
* unspecified width,
* and the width will be inferred from the way the relation is used
* (but will never be less than zero).
* This method invalidates
* the resolved types on the director of the container, if there is
* one, and notifies each connected actor that its connections
* have changed.
* This method write-synchronizes on the workspace.
*
* @param widthValue The width of the relation.
* @exception IllegalActionException If the argument is not zero, one,
* or equal to WIDTH_TO_INFER and the relation is linked to a
* non-multiport. Or when the argument is less than zero and different
* from WIDTH_TO_INFER.
* @see ptolemy.kernel.util.Workspace#getWriteAccess()
* @see #getWidth()
*/
public void setWidth(int widthValue) throws IllegalActionException {
width.setToken(new IntToken(widthValue));
}
///////////////////////////////////////////////////////////////////
//// public variables ////
/** Indicate that the description(int) method should describe the width
* of the relation, and whether it has been fixed.
*/
public static final int CONFIGURATION = 512;
/** The value of the width we should infer. */
public static final int WIDTH_TO_INFER = -1;
///////////////////////////////////////////////////////////////////
//// protected methods ////
/** Throw an exception if the specified port cannot be linked to this
* relation (is not of class IOPort).
* @param port The candidate port to link to.
* @exception IllegalActionException If the port is not an IOPort.
*/
@Override
protected void _checkPort(Port port) throws IllegalActionException {
if (!(port instanceof IOPort)) {
throw new IllegalActionException(this, port,
"IORelation can only link to a IOPort.");
}
}
/** Throw an exception if the specified relation is not an instance
* of IORelation or if it does not have the same width as this relation.
* @param relation The relation to link to.
* @param symmetric If true, the call _checkRelation() on the specified
* relation with this as an argument.
* @exception IllegalActionException If this relation has no container,
* or if this relation is not an acceptable relation for the specified
* relation, or if this relation and the specified relation do not
* have the same width.
*/
@Override
protected void _checkRelation(Relation relation, boolean symmetric)
throws IllegalActionException {
if (!(relation instanceof IORelation)) {
throw new IllegalActionException(this, relation,
"IORelation can only link to an IORelation.");
}
int otherWidth = ((IORelation) relation)._getUserWidth();
int width = _getUserWidth();
if (otherWidth != width) {
// If one of both widths equals WIDTH_TO_INFER we set both to the other width
// (which will be different from WIDTH_TO_INFER).
if (otherWidth == WIDTH_TO_INFER) {
((IORelation) relation).setWidth(width);
} else if (width == WIDTH_TO_INFER) {
setWidth(otherWidth);
} else {
throw new IllegalActionException(this, relation,
"Relations have different widths: " + _getUserWidth()
+ " != "
+ ((IORelation) relation)._getUserWidth());
}
}
super._checkRelation(relation, symmetric);
}
/** Return a description of the object. The level of detail depends
* on the argument, which is an or-ing of the static final constants
* defined in the NamedObj class and in this class.
* Lines are indented according to
* to the level argument using the protected method _getIndentPrefix().
* Zero, one or two brackets can be specified to surround the returned
* description. If one is specified it is the the leading bracket.
* This is used by derived classes that will append to the description.
* Those derived classes are responsible for the closing bracket.
* An argument other than 0, 1, or 2 is taken to be equivalent to 0.
*
* If the detail argument sets the bit defined by the constant
* CONFIGURATION, then append to the description is a field
* of the form "configuration {width integer ?fixed?}", where the
* word "fixed" is present if the relation has fixed width, and is
* absent if the relation is a bus with inferred width (isWidthFixed()
* returns false).
*
* This method is read-synchronized on the workspace.
*
* @param detail The level of detail.
* @param indent The amount of indenting.
* @param bracket The number of surrounding brackets (0, 1, or 2).
* @return A description of the object.
* @exception IllegalActionException If thrown while getting the
* description of subcomponents.
*/
@Override
protected String _description(int detail, int indent, int bracket)
throws IllegalActionException {
try {
_workspace.getReadAccess();
String result;
if (bracket == 1 || bracket == 2) {
result = super._description(detail, indent, 1);
} else {
result = super._description(detail, indent, 0);
}
if ((detail & CONFIGURATION) != 0) {
if (result.trim().length() > 0) {
result += " ";
}
result += "configuration {";
result += "width " + getWidth();
if (isWidthFixed()) {
result += " fixed";
}
result += "}";
}
if (bracket == 2) {
result += "}";
}
return result;
} finally {
_workspace.doneReading();
}
}
/**Determines whether width inference should be skipped or not.
* @return True when width inference needs to be skipped.
*/
protected boolean _skipWidthInference() {
return false;
}
///////////////////////////////////////////////////////////////////
//// packaged methods ////
/** Set the inferred width of this relation. The width is the number of
* channels that the relation represents.
* This method is not synchronized on the workspace.
* This packaged method is only meant for the width inference
* algorithm. It should not be used in other circumstances.
* Precondition: you should only infer the width in case it
is not set by the user.
* @param width The inferred width of the relation.
* @exception IllegalActionException If the expression for the width cannot
* be parsed or cannot be evaluated, or if the result of evaluation
* violates type constraints, or if the result of evaluation is null
* and there are variables that depend on this one.
*/
void _setInferredWidth(int width) throws IllegalActionException {
assert _getUserWidth() == WIDTH_TO_INFER;
// Precondition: you should only infer the width in case it
// is not set by the user.
assert width >= 0;
_inferredWidthVersion = _workspace.getVersion();
_inferredWidth = width;
}
///////////////////////////////////////////////////////////////////
//// private parameters ////
/** A parameter to be able to set the width to Auto to automatically
* infer widths. This is an integer that equals WIDTH_TO_INFER.
*/
private Parameter _auto = null;
///////////////////////////////////////////////////////////////////
//// private methods ////
/** Cascade two Receiver arrays to form a new array. For each row, each
* element of the second array is appended behind the elements of the
* first array. This method is solely for deepReceivers.
* The two input arrays must have the same number of rows.
* @exception IllegalActionException
*/
private Receiver[][] _cascade(Receiver[][] array1, Receiver[][] array2)
throws InvalidStateException, IllegalActionException {
if (array1 == null || array1.length <= 0) {
return array2;
}
if (array2 == null || array2.length <= 0) {
return array1;
}
int width = getWidth();
Receiver[][] result = new Receiver[width][0];
for (int i = 0; i < width; i++) {
if (array1[i] == null) {
result[i] = array2[i];
} else if (array1[i].length <= 0) {
result[i] = array2[i];
} else if (array2[i] == null) {
result[i] = array1[i];
} else if (array2[i].length <= 0) {
result[i] = array1[i];
} else {
int m1 = array1[i].length;
int m2 = array2[i].length;
result[i] = new Receiver[m1 + m2];
for (int j = 0; j < m1; j++) {
result[i][j] = array1[i][j];
}
for (int j = m1; j < m1 + m2; j++) {
result[i][j] = array2[i][j - m1];
}
}
}
return result;
}
/** Return the width set by the user
* @return The width set by the user.
* @exception IllegalActionException If the expression for the width cannot
* be parsed or cannot be evaluated, or if the result of evaluation
* violates type constraints, or if the result of evaluation is null
* and there are variables that depend on this one.
*/
private int _getUserWidth() throws IllegalActionException {
if (_cachedWidth == -2) {
IntToken t = (IntToken) width.getToken();
if (t != null) {
int width = t.intValue();
_setWidth(width);
}
}
return _cachedWidth;
}
/** Determine whether widths are currently being inferred or not.
* @return True When widths are currently being inferred.
* @exception IllegalActionException If toplevel not a CompositeActor.
*/
private boolean _inferringWidths() throws IllegalActionException {
Nameable container = getContainer();
if (container instanceof CompositeActor) {
return ((CompositeActor) container).inferringWidths();
}
return false;
}
/** Infer the width of the port from how it is connected.
* Throw a runtime exception if this cannot be done (normally,
* the methods that construct a topology ensure that it can be
* be done). The returned value is always at least one.
* This method is not read-synchronized on the workspace, so the caller
* should be.
* @return The inferred width.
* @exception IllegalActionException
*/
private int _inferWidth() throws IllegalActionException {
//The old algorithm for width inference
assert !_USE_NEW_WIDTH_INFERENCE_ALGO;
long version = _workspace.getVersion();
if (version != _inferredWidthVersion) {
_inferredWidth = 1;
Iterator> ports = linkedPortList().iterator();
// Note that depending on the order of the ports get iterated,
// the inferred width may be different if different ports have
// different widths. This is nondeterministic.
// However, the model behavior is not affected by this because
// the relation with the smallest width along a path decides
// the number of signals that can be passed through.
while (ports.hasNext()) {
IOPort p = (IOPort) ports.next();
// Infer the width of this port from the linked connections.
// Note we assume that this method is only called upon a
// multiport.
// To guarantee this method successfully infer widths, we have
// to check and ensure that there is at most one input relation
// or one output relation whose width is not fixed (unknown).
// This requirement is conservative. For example, an output
// port may have two buses with their widths not fixed.
// Furthermore, if one of the buses is connected to an input
// port and its width can be determined from the internal
// connections associated with that input port, the width of
// the other bus can also be resolved. However, to support this,
// a fixed-point iteration has to be performed, but there is
// no guarantee of existence of a useful fixed-point whose
// widths are all non-zero. Therefore, we take the conservative
// approach.
// To infer the unknown width, we resolve the equation where
// the sum of the widths of input relations equals the sum of
// those of output relations.
int portInsideWidth = 0;
int portOutsideWidth = 0;
int difference = 0;
if (p.isInsideGroupLinked(this)) {
// I am linked on the inside...
portInsideWidth = p._getInsideWidth(this);
portOutsideWidth = p._getOutsideWidth(null);
// the same as portOutsideWidth = p.getWidth();
difference = portOutsideWidth - portInsideWidth;
} else if (p.isLinked(this)) {
// I am linked on the outside...
portInsideWidth = p._getInsideWidth(null);
portOutsideWidth = p._getOutsideWidth(this);
difference = portInsideWidth - portOutsideWidth;
}
if (difference > _inferredWidth) {
_inferredWidth = difference;
}
}
_inferredWidthVersion = version;
}
return _inferredWidth;
}
/** Create an initialize the width parameter. */
private void _init() {
try {
_auto = new Parameter(this, "Auto");
_auto.setExpression(Integer.toString(WIDTH_TO_INFER));
_auto.setTypeEquals(BaseType.INT);
_auto.setVisibility(Settable.NONE);
_auto.setPersistent(false);
width = new Parameter(this, "width");
width.setExpression("Auto");
width.setTypeEquals(BaseType.INT);
} catch (KernelException ex) {
throw new InternalErrorException(ex);
}
}
/** Set the width of this relation and all relations in its
* relation group. The width is the number of
* channels that the relation represents. If the argument
* is equal to the value of WIDTH_TO_INFER, then the relation becomes
* a bus with unspecified width,
* and the width will be inferred from the way the relation is used
* (but will never be less than zero).
* This method invalidates
* the resolved types on the director of the container, if there is
* one, and notifies each connected actor that its connections
* have changed.
* This method write-synchronizes on the workspace.
*
* @param width The width of the relation.
* @exception IllegalActionException If the argument is not zero, one,
* or equal to WIDTH_TO_INFER and the relation is linked to a
* non-multiport. Or when the argument is less than zero and different
* from WIDTH_TO_INFER.
* @see ptolemy.kernel.util.Workspace#getWriteAccess()
* @see #getWidth()
*/
private void _setWidth(int width) throws IllegalActionException {
if (_USE_NEW_WIDTH_INFERENCE_ALGO) {
if (width == _cachedWidth) {
// No change.
return;
}
try {
_workspace.getWriteAccess();
// Check legitimacy of the change.
if (width < 0 && width != WIDTH_TO_INFER) {
throw new IllegalActionException(this, "" + width
+ " is not a valid width for this relation.");
}
/* rodiers: I'd rather keep the following exception since it makes the
* model more consistent, but some tests seem to use this pattern.
*
// Check for non-multiports on a link: should either be 0, 1 or should be inferred.
if (width != 1 && width != 0 && width != WIDTH_TO_INFER) {
for (Object object : linkedPortList()) {
IOPort p = (IOPort) object;
if (!p.isMultiport()) {
throw new IllegalActionException(this, p,
"Cannot make bus because the "
+ "relation is linked to a non-multiport.");
}
}
}
*/
_cachedWidth = width;
// Set the width of all relations in the relation group.
Iterator> relations = relationGroupList().iterator();
while (!_suppressWidthPropagation && relations.hasNext()) {
IORelation relation = (IORelation) relations.next();
if (relation == this) {
continue;
}
// If the relation has a width parameter, set that
// value. Otherwise, just set its width directly.
// Have to disable back propagation.
try {
relation._suppressWidthPropagation = true;
relation.width.setToken(new IntToken(width));
} finally {
relation._suppressWidthPropagation = false;
}
}
// Invalidate schedule and type resolution.
Nameable container = getContainer();
if (container instanceof CompositeActor) {
((CompositeActor) container).notifyConnectivityChange();
Director director = ((CompositeActor) container)
.getDirector();
if (director != null) {
director.invalidateSchedule();
director.invalidateResolvedTypes();
}
}
// According to the comments this used to happen for this reason:
// Do this as a second pass so that it does not
// get executed if the change is aborted
// above by an exception.
// FIXME: Haven't completely dealt with this
// possibility since the above changes may have
// partially completed.
// With the new width inference algorithm the code below does not
// need to be executed for this reason. However some actors
// do some initialization in the connectionsChanged method that they
// don't do at other points of time.
for (Object port : linkedPortList()) {
IOPort p = (IOPort) port;
Entity portContainer = (Entity) p.getContainer();
if (portContainer != null) {
portContainer.connectionsChanged(p);
}
}
} finally {
// About conditionally executing doneWriting:
// When the user updates the width we want to increase
// the workspace version to invalidate widths that are being
// cached by IOPort.
// Parameters however have in some sense a strange behavior,
// when the user sets a Parameter (such as width) this typically
// happens with setToken, which - in case the Parameter is not
// lazy - immediately results in the call attributedChanged, which
// will call _setWidth. However when the project is opened, setExpression
// is used. In the case the expression in not immediately evaluated, but
// only when it is necessary. When you call getToken, the expression is evaluated
// which results in the call of attributedChanged, which again results
// in the call _setWidth. In this case however the model didn't change this
// time, but earlier. Typically this happens after opening the model, of creating
// a new relation. This already increased the version of the model, and hence
// cached values or refreshed. Triggering of the width then happens when doing
// width inference. Then we don't want to increase the version number since it would
// invalidate all widths immediately.
// Probably this construct works in practise, but it remains a dangerous one...
if (_inferringWidths()) {
_workspace.doneTemporaryWriting();
} else {
_workspace.doneWriting();
}
}
} else {
if (width == _cachedWidth) {
// No change.
return;
}
try {
_workspace.getWriteAccess();
if (width <= 0) {
// Check legitimacy of the change.
try {
_inferWidth();
} catch (InvalidStateException ex) {
throw new IllegalActionException(this, ex,
"Cannot use unspecified width on this relation "
+ "because of its links.");
}
}
// Check for non-multiports on a link.
/* This is now allowed.
if (width != 1) {
Iterator ports = linkedPortList().iterator();
while (ports.hasNext()) {
IOPort p = (IOPort) ports.next();
// Check for non-multiports.
if (!p.isMultiport()) {
throw new IllegalActionException(this, p,
"Cannot make bus because the "
+ "relation is linked to a non-multiport.");
}
}
}
*/
_cachedWidth = width;
// Set the width of all relations in the relation group.
Iterator> relations = relationGroupList().iterator();
while (!_suppressWidthPropagation && relations.hasNext()) {
IORelation relation = (IORelation) relations.next();
if (relation == this) {
continue;
}
// If the relation has a width parameter, set that
// value. Otherwise, just set its width directly.
// Have to disable back propagation.
try {
relation._suppressWidthPropagation = true;
relation.width.setToken(new IntToken(width));
} finally {
relation._suppressWidthPropagation = false;
}
}
// Do this as a second pass so that it does not
// get executed if the change is aborted
// above by an exception.
// FIXME: Haven't completely dealt with this
// possibility since the above changes may have
// partially completed.
Iterator> ports = linkedPortList().iterator();
while (ports.hasNext()) {
IOPort p = (IOPort) ports.next();
Entity portContainer = (Entity) p.getContainer();
if (portContainer != null) {
portContainer.connectionsChanged(p);
}
}
// Invalidate schedule and type resolution.
Nameable container = getContainer();
if (container instanceof CompositeActor) {
Director director = ((CompositeActor) container)
.getDirector();
if (director != null) {
director.invalidateSchedule();
director.invalidateResolvedTypes();
}
}
} finally {
_workspace.doneWriting();
}
}
}
///////////////////////////////////////////////////////////////////
//// packaged variables ////
/** Indicate whether the new or the old width inference algo should be used
* This is a packaged field.
*/
public static final boolean _USE_NEW_WIDTH_INFERENCE_ALGO = true;
///////////////////////////////////////////////////////////////////
//// private variables ////
// Cached inferred width.
private transient int _inferredWidth = -1;
// The workspace version for the cached inferred width.
private transient long _inferredWidthVersion = -1;
// Suppress propagation of width changes.
private boolean _suppressWidthPropagation = false;
// The cached value of the width parameter.
private int _cachedWidth = -2;
}