PTOLEMY II - CiteSeerX

More documents

Recommendations

Info

MoML tainer by calling its requestChange() method. This ensures that the mutation is executed only when it is safe to modify the structure of the model. The class MoMLChangeRequest (see figure 7.9) can be used for this purpose. Simply create an instance of this class, providing the constructor with a string containing the MoML code that specifies the change. The exportMoML() methods of Ptolemy II objects can be used to produce a MoML file given a model. Thus, MoML can be used as the persistent file format for Ptolemy II models 7.6 Exporting MoML Almost any Ptolemy II object can export a MoML description of itself. The following methods of NamedObj (and derived classes) are particularly useful: exportMoML(): String exportMoML(output: Writer) exportMoML(output: Writer, depth: int) exportMoML(output: Writer, depth: int, name: String) _exportMoMLContents(output: Writer, depth: int) Since any object derived from NamedObj can export MoML, MoML becomes an effective persistent format for Ptolemy II models. Almost everything in Ptolemy II is derived from NamedObj. It is much more compact than serializing the objects, and the description is much more durable (since serialized objects are not guaranteed to load properly into future versions of the Java virtual machine). There is one significant subtlety that occurs when an entity is instantiated from a class defined in MoML. Consider the example: This model defines one class and one entity that instantiates that class. When we export MoML for this top-level model, we get: Aside from some minor differences in syntax, this is identical to our specification above. In particular, note that the entity “derived” does not describe its port “p” even though it certainly has such a port. That port is implied because the entity instantiates the class “.top.master”. 220 Ptolemy II
MoML Suppose that using incremental parsing we subsequently modify the model as follows: That is, we add a port to the instantiated entity. Then the added port is exported when we export MoML. That is, we get: This is what we would expect. The entity is based on the specified class, but actually extends it with additional features. Those features are persistent. Properties are treated more simply. They are always described when MoML is exported, regardless of whether they are defined in the class on which an entity is based. The reason for this is that properties are usually modified in instances, for example by giving them new values. There is an additional subtlety. If a topology is modified by making direct kernel calls, then export- MoML() will normally export the modified topology. However, if a derived component is modified by direct kernel calls, then exportMoML() will fail to catch the changes. In fact, only if the changes are made by evaluating MoML will the modifications be exported. This actually can prove to be convenient. It means that if a model mutates during execution, and is later saved, that a user interface can ensure that only the original model, before mutations, is saved. 7.7 Special Attributes The moml package also includes a set of attribute classes that decorate the objects in a model with MoML-specific information, as shown in figure 7.10. These classes are used to decorate a Ptolemy II object with additional information that is relevant to a GUI or other user interface. For example, the Location class is used to specify the location of visual rendition of a component in a visual editor. A Vertex decorates a relation with one of several visual handles to which connections can be made. A MoMLAttribute decorates an object with a property that can describe itself with arbitrary MoML. 7.8 Acknowledgements Many thanks to Ed Willink of Racal Research Ltd. and Simon North of Synopsys for many helpful suggestions, only some of which have made it into this version of MoML. Also, thanks to Tom Henzinger, Alberto Sangiovanni-Vincentelli, and Kees Vissers for helping clarify issues of abstract syntax. Heterogeneous Concurrent Modeling and Design 221
Page 1 and 2:
PTOLEMY II HETEROGENEOUS CONCURRENT
Page 3 and 4:
VOLUME 1 INTRODUCTION TO PTOLEMY II
Page 5 and 6:
Volume 1 Contents Introduction to P
Page 7 and 8:
2.10.3. Constructing Modal Models 8
Page 9 and 10:
7. MoML 191 7.1. Introduction 191 7
Page 11 and 12:
1 Introduction Author: Edward A. Le
Page 13 and 14:
Introduction heterochronous dataflo
Page 15 and 16:
Introduction A major emphasis in Pt
Page 17 and 18:
Introduction determine when actors
Page 19 and 20:
Introduction provides levels of vis
Page 21 and 22:
Introduction is a guard, and the se
Page 23 and 24:
Introduction well. All of these are
Page 25 and 26:
Introduction clients to update thei
Page 27 and 28:
Introduction will be supplied with
Page 29 and 30:
Introduction 1.3.12 Synchronous Dat
Page 31 and 32:
Introduction FIGURE 1.10. Refinemen
Page 33 and 34:
Introduction occlusions due to terr
Page 35 and 36:
Introduction tion. The overall arch
Page 37 and 38:
Introduction kernel.attributes This
Page 39 and 40:
Introduction 1.5.2 Overview of Key
Page 41 and 42:
Introduction Actor interfaces are k
Page 43 and 44:
Heterogeneous Concurrent Modeling a
Page 45 and 46:
Introduction actor actor.gui data.e
Page 47 and 48:
Introduction cient, scalable, and u
Page 49 and 50:
Introduction 1.5.8 Future Capabilit
Page 51 and 52:
Introduction Appendix A: UML — Un
Page 53 and 54:
Introduction grams, the only constr
Page 55 and 56:
2 Using Vergil Authors: Edward A. L
Page 57 and 58:
Using Vergil 2.2.2 Executing a Pre-
Page 59 and 60:
Using Vergil The Lorenz attractor m
Page 61 and 62:
Using Vergil The Continuous-Time (C
Page 63 and 64:
Using Vergil box in figure 2.11. En
Page 65 and 66:
Using Vergil Don’t panic! Excepti
Page 67 and 68:
Using Vergil tions are a normal par
Page 69 and 70:
Using Vergil 2.4 Hierarchy Ptolemy
Page 71 and 72:
Using Vergil Then using these ports
Page 73 and 74:
Using Vergil the default 0.1 to 0.0
Page 75 and 76:
Using Vergil pan window, it is easy
Page 77 and 78:
Using Vergil FIGURE 2.33. The pan w
Page 79 and 80:
Using Vergil we have modified the c
Page 81 and 82:
Using Vergil model, simply copy (or
Page 83 and 84:
Using Vergil A key issue is to deci
Page 85 and 86:
Using Vergil instances. This proble
Page 87 and 88:
Using Vergil quick tour for more de
Page 89 and 90:
Using Vergil uses the index in the
Page 91 and 92:
Using Vergil AddSubtract actor, and
Page 93 and 94:
Using Vergil If you look inside the
Page 95 and 96:
Using Vergil If you look inside the
Page 97 and 98:
Using Vergil transition (or right c
Page 99 and 100:
Using Vergil Once you have created
Page 101 and 102:
Using Vergil The grid is turned off
Page 103 and 104:
Authors: Edward A. Lee Xiaojun Liu
Page 105 and 106:
Expressions classes to create a gen
Page 107 and 108:
Expressions The % operation is a mo
Page 109 and 110:
Expressions attribute, which includ
Page 111 and 112:
Expressions 3.3.5 State Machines Ex
Page 113 and 114:
Expressions whose value is an array
Page 115 and 116:
Expressions from it. For instance,
Page 117 and 118:
Expressions defined. For example, >
Page 119 and 120:
Expressions length is given by the
Page 121 and 122:
Expressions Thus, for example, you
Page 123 and 124:
Expressions number. With one additi
Page 125 and 126:
Expressions value. For example, fix
Page 127 and 128:
Expressions In the example in figur
Page 129 and 130:
Expressions A.2 Basic Mathematical
Page 131 and 132:
Expressions A.3 Matrix, Array, and
Page 133 and 134:
Expressions A.5 Signal Processing F
Page 135 and 136:
Expressions TABLE 8: Functions perf
Page 137 and 138:
4 Actor Libraries Authors: Elaine C
Page 139 and 140:
Actor Libraries properly in the CT
Page 141 and 142:
Actor Libraries ing that multiple c
Page 143 and 144:
Actor Libraries TypedAtomicActor «
Page 145 and 146:
Actor Libraries SequenceScope (exte
Page 147 and 148:
Actor Libraries UnsignedByteArrayTo
Page 149 and 150:
Actor Libraries MobileFunction (ext
Page 151 and 152:
Actor Libraries LogicFunction (exte
Page 153 and 154:
Actor Libraries Sleep (extends Tran
Page 155 and 156:
Actor Libraries VariableFIR (extend
Page 157 and 158:
Actor Libraries Integrator: Integra
Page 159 and 160:
Actor Libraries Figure 4.4 shows th
Page 161 and 162:
5 Designing Actors Authors: Christo
Page 163 and 164:
Designing Actors /** Javadoc commen
Page 165 and 166:
Designing Actors although with most
Page 167 and 168:
Designing Actors import ptolemy.act
Page 169 and 170:
Designing Actors makes such actors
Page 171 and 172:
Designing Actors same parameter val
Page 173 and 174:
Designing Actors morphic actor comp
Page 175 and 176:
Designing Actors To get data polymo
Page 177 and 178:
Designing Actors public class Seque
Page 179 and 180: Designing Actors be used in domains
Page 181 and 182: Designing Actors alComm actor. Beca
Page 183 and 184: Designing Actors attribute has valu
Page 185 and 186: Designing Actors import ptolemy.act
Page 187 and 188: 6 Coding Style Authors: Christopher
Page 189 and 190: Coding Style /* One line descriptio
Page 191 and 192: Coding Style Copyright (c) 2004 The
Page 193 and 194: Coding Style @version $Id: NamedObj
Page 195 and 196: Coding Style } We use instead the i
Page 197 and 198: Coding Style * @exception MyExcepti
Page 199 and 200: Coding Style + "it does not impleme
Page 201 and 202: Authors: Edward A. Lee Steve Neuend
Page 203 and 204: MoML cutes it forever, until you hi
Page 205 and 206: MoML A second difference between ou
Page 207 and 208: MoML
Page 209 and 210: MoML 7.3.3 Names and Classes Most M
Page 211 and 212: MoML Here, the element named
Page 213 and 214: MoML implement. 7.3.7 Doc Element S
Page 215 and 216: MoML It is also sometimes necess
Page 217 and 218: MoML then there will be a link t
Page 219 and 220: MoML found. For example, if the cla
Page 221 and 222: MoML it cannot collide with the nam
Page 223 and 224: MoML The rendering of the icon is d
Page 225 and 226: MoML 7.4.5 Deleting Entities, Relat
Page 227 and 228: MoML This unlinks a port from the s
Page 229: MoML model. The EntityLibrary class
Page 233 and 234: MoML Generate a sine wave.
Page 235 and 236: MoML
Page 237 and 238: MoML Number of iterations in
Page 239 and 240: MoML -P- The f
Page 241 and 242: MoML -P- The phase,
Page 243 and 244: 8 Custom Applets Authors: Edward A.
Page 245 and 246: Custom Applets html code, see the J
Page 247 and 248: Custom Applets public class Tutoria
Page 249 and 250: Custom Applets then the result of
Page 251 and 252: Custom Applets 8.3.5 Using Model Pa
Page 253 and 254: Custom Applets ptolemy/domains/doma
Page 255 and 256: References [1] G. Agha, Actors: A M
Page 257 and 258: [33] S. A. Edwards, “The Specific
Page 259 and 260: [67] E. Kohler, The Click Modular R
Page 261 and 262: [95] J. Liu, X. Liu, T. J. Koo, B.
Page 263 and 264: [132]W. R. Sutherland, "The on-Line
Page 265 and 266: Glossary abstract syntax ..........
Page 267 and 268: Ptolemy II ........................
Page 269 and 270: Index Symbols - in UML 41 # in UML
Page 271 and 272: coin flips 142 Color class 173 colo
Page 273 and 274: entity in XML 198 EntityLibrary cla
Page 275 and 276: Director class 159 inverse FFT 124
Page 277 and 278: CompositeEntity class 206 nextPower
Page 279 and 280: safety 34 SampleDelay actor 78, 138
Page 281 and 282:
type constraint 155 type constraint
show all

PTOLEMY II - CiteSeerX

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?