<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd"> <!-- Created with Sodipodi ("http://www.sodipodi.com/") --> <svg id="svg548" sodipodi:version="0.32" width="210mm" height="297mm" sodipodi:docbase="/home/mcr70/projects/jiapi/docs/" sodipodi:docname="/home/mcr70/projects/jiapi/docs/field-interceptor.svg" xmlns="http://www.w3.org/2000/svg" xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" xmlns:xlink="http://www.w3.org/1999/xlink"> <defs id="defs550"> <linearGradient id="linearGradient676"> <stop style="stop-color:#000;stop-opacity:1;" offset="0" id="stop677" /> <stop style="stop-color:#fff;stop-opacity:1;" offset="1" id="stop678" /> </linearGradient> <linearGradient xlink:href="#linearGradient676" id="linearGradient679" x1="0.00000021" y1="-0.00000048" x2="1.00000012" y2="-0.00000048" gradientUnits="objectBoundingBox" spreadMethod="pad" /> 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style="fill:black;stroke:#ba0000;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="138.750000" y="321.112152" id="text640"> <tspan id="tspan641" style="stroke:#ba0000;stroke-opacity:1;"> ...</tspan> <tspan sodipodi:role="line" id="tspan643" x="138.750000" y="333.112152" style="stroke:#ba0000;stroke-opacity:1;"> interceptor.setField(this, String fName,</tspan> <tspan sodipodi:role="line" id="tspan645" x="138.750000" y="345.112152" style="stroke:#ba0000;stroke-opacity:1;"> Object value)</tspan> <tspan sodipodi:role="line" id="tspan647" x="138.750000" y="357.112152" style="stroke:#ba0000;stroke-opacity:1;"> ...</tspan> </text> <rect style="font-size:12;fill:none;fill-rule:evenodd;stroke:#ba0000;stroke-width:1.13759pt;stroke-opacity:1;" id="rect649" width="236.250000" height="55.000002" x="133.750000" y="311.112147" /> </g> <path 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y="383.192062" id="text656"> <tspan id="tspan657"> Target Class</tspan> </text> <text style="font-size:12;font-weight:normal;stroke-width:1pt;font-family:helvetica;" x="153.461971" y="402.988419" id="text660"> <tspan id="tspan661"> public void someField</tspan> </text> <rect style="font-size:12;fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:0.670841pt;" id="rect667" width="167.500000" height="20.251236" x="148.461967" y="389.818954" /> </g> <g id="g756"> <rect style="font-size:12;fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1.19257pt;" id="rect617" width="247.112298" height="186.250000" x="331.232828" y="487.353149" /> <text style="font-size:12;font-weight:normal;stroke-width:1pt;font-family:helvetica;" x="521.250000" y="367.362152" id="text618" transform="translate(-180.0171,134.9910)"> <tspan id="tspan619"> FieldHandler</tspan> </text> <rect style="font-size:12;fill:none;fill-rule:evenodd;stroke:#0d0000;stroke-width:1.17803pt;" id="rect720" width="212.385178" height="65.606583" x="345.006172" y="508.584198" /> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="351.785652" y="524.683685" id="text721"> <tspan id="tspan722"> setField(Object, String, Object) {</tspan> <tspan sodipodi:role="line" id="tspan724" x="351.785645" y="536.683655"> </tspan> <tspan sodipodi:role="line" id="tspan726" x="351.785645" y="548.683655"> </tspan> <tspan sodipodi:role="line" id="tspan728" x="351.785645" y="560.683655"> }</tspan> </text> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="367.695564" y="542.361298" id="text730"> <tspan id="tspan731"> java.lang.reflect.Field.set(o, value)</tspan> </text> </g> <g id="g774"> <rect 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id="g825" transform="translate(-35.35534,5.303314)"> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="579.827637" y="308.132202" id="text803"> <tspan id="tspan804"> 1</tspan> </text> <path sodipodi:type="arc" style="stroke:#000000;stroke-opacity:1;fill:none;stroke-width:1.25;stroke-dasharray:none;stroke-dashoffset:0;fill-rule:evenodd;fill-opacity:1;stroke-linejoin:miter;stroke-linecap:butt;" id="path814" d="M 91.923897 498.609131 A 7.954952 7.513000 0 1 0 76.014000,498.609131 A 7.95495 7.513 0 1 0 91.9239 498.609 L 83.968948 498.609131 z" sodipodi:cx="83.968948" sodipodi:cy="498.609131" sodipodi:rx="7.954952" sodipodi:ry="7.513000" transform="translate(499.3943,-194.4544)" /> </g> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="31.819809" y="27.057236" id="text830"> <tspan id="tspan831"> FieldInterceptor: Instrumentation strategy reflection</tspan> </text> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="69.8268013" y="82.7418671" id="text838" transform="translate(2.067771,-3.051758e-5)"> <tspan id="tspan839"> When code executes at that point, instrumented class calls</tspan> <tspan sodipodi:role="line" id="tspan841" x="69.8267975" y="94.7418671"> interceptor instead of field-access instruction.</tspan> </text> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="69.8267975" y="112.793900" id="text843" transform="translate(1.791773,-3.051758e-5)"> <tspan id="tspan844"> Interceptor finds corresponding java.lang.reflect.Field, and</tspan> <tspan sodipodi:role="line" id="tspan846" x="69.8267975" y="124.793900"> passes this to FieldHandler</tspan> </text> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="70.7106857" y="145.497604" id="text848" transform="translate(0.883884,-3.051758e-5)"> <tspan id="tspan849"> FieldHandler sets (or gets) the value of the field. </tspan> </text> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="71.5945644" y="164.059158" id="text855"> <tspan id="tspan856"> Program flow returns eventually back to instrumented </tspan> <tspan sodipodi:role="line" id="tspan858" x="71.5945663" y="176.059158"> class, which does possible unwrapping of primitive types</tspan> </text> <g id="g860" transform="translate(-531.2141,-220.0870)"> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="579.827637" y="308.132202" id="text861"> <tspan id="tspan862"> 1</tspan> </text> <path sodipodi:type="arc" 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style="stroke:#000000;stroke-opacity:1;fill:none;stroke-width:1.25;stroke-dasharray:none;stroke-dashoffset:0;fill-rule:evenodd;fill-opacity:1;stroke-linejoin:miter;stroke-linecap:butt;" id="path884" d="M 91.923897 498.609131 A 7.954952 7.513000 0 1 0 76.014000,498.609131 A 7.95495 7.513 0 1 0 91.9239 498.609 L 83.968948 498.609131 z" sodipodi:cx="83.968948" sodipodi:cy="498.609131" sodipodi:rx="7.954952" sodipodi:ry="7.513000" transform="translate(146.7247,3.535507)" /> </g> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="70.5698090" y="782.057220" id="text885"> <tspan id="tspan886"> FieldInterceptor: Instrumentation strategy direct-proxy</tspan> </text> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="120.000000" y="798.612152" id="text890"> <tspan id="tspan891"> Same as above, but...</tspan> <tspan sodipodi:role="line" id="tspan893" x="120.000000" y="810.612122"> Instrumented class calls field-proxy directly.</tspan> <tspan sodipodi:role="line" id="tspan895" x="120.000000" y="822.612122"> Field-proxy is a class generated at runtime, which</tspan> <tspan sodipodi:role="line" id="tspan897" x="120.000000" y="834.612122"> is in the same package as target object(thus having</tspan> <tspan sodipodi:role="line" id="tspan899" x="120.000000" y="846.612122"> package access properties) etc.</tspan> <tspan sodipodi:role="line" id="tspan901" x="120.000000" y="858.612122"> </tspan> <tspan sodipodi:role="line" id="tspan903" x="120.000000" y="870.612122"> FieldHandler gets this Proxy as a parameter....</tspan> <tspan sodipodi:role="line" id="tspan905" x="120.000000" y="882.612122"> </tspan> </text> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="70.0000000" y="763.612152" id="text907"> <tspan id="tspan908"> TBDL:</tspan> </text> <text style="fill:black;stroke:none;font-family:helvetica;font-style:normal;font-weight:normal;font-size:12px;fill-opacity:1;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;" x="442.500000" y="818.612152" id="text910"> <tspan id="tspan911"> proxying like this saves the overhead</tspan> <tspan sodipodi:role="line" id="tspan913" x="442.500000" y="830.612122"> of java.lang.reflect.... calls</tspan> </text> <path style="fill:none;fill-rule:evenodd;stroke:black;stroke-opacity:1;stroke-width:1pt;stroke-linejoin:miter;stroke-linecap:butt;fill-opacity:1;" d="M 403.75 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