Hi Chris,<br><br>You can use 'accumulate' with sliding time window. Have a look here <a href="http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-fusion/html/ch02.html#d0e1169">http://downloads.jboss.com/drools/docs/5.0.1.26597.FINAL/drools-fusion/html/ch02.html#d0e1169</a><br>
<br><pre class="programlisting"><a id="d0e1183">rule "Sound the alarm in case temperature rises above threshold"<br>when<br> TemperatureThreshold( $max : max )<br> Number( doubleValue > $max ) from accumulate(<br>
SensorReading( $temp : temperature ) over window:time( 10m ),<br> average( $temp ) )<br>then<br> // sound the alarm<br>end<br></a></pre><a id="d0e1183">The engine will automatically discard any SensorReading older
than 10 minutes and keep the calculated average consistent.</a><br><br>Is that what you're looking for?<br><br>Michal<br><br><br><div class="gmail_quote">2009/5/27 Chris Richmond <span dir="ltr"><<a href="mailto:crichmond@referentia.com">crichmond@referentia.com</a>></span><br>
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<div link="blue" vlink="purple" lang="EN-US">
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<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Hello,</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">I have modified the stockTicker fusion example to keep some
running stats, you can see from the rule snippet below that it injects a stats
object based on the symbol then matches them as updates come in later. You can
see for now I am just updating the running counts and outputting the readings
count on each stock tick and this works fine.</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">What I would like to do however is only have the running
averages,stats object reflect stock ticks that are still in memory….essentiall
only stock tick items that have not expired. As it is now the count just keeps
growing and growing, I want the count to only reflect the stock ticks within
the expiration time in the past for stock ticks, but I cannot figure out how to
make this happen? Could anyone give me a pointer on how to do this? How to
make the stats object only reflect those stock ticks that have not expired? I
do not know the strategy for this.</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Thanks,</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;">Chris</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p style=""><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;"># tells the engine that a StockTick instance will assume the</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;"># role (semantics) of events and that the default retention </span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;"># policy will be 2 minutes </span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">declare</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> StockTick</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> @role( event )</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> @expires( 1m )</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">end</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p style=""><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;"># One can even declare helper facts to make rules easier and</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;"># simpler to write and maintain</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">declare</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> Statistics</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> symbol : String @key()</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> average : </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">double</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> readings : </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">int</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> total : </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">double</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">end</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">rule</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="green" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: green;">"Setup
statistics"</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">when</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> $c : Company( $s : symbol )</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">not</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;">( Statistics(
symbol == $s ) )</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">then</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> Statistics s = </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">new</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> Statistics();</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> s.symbol = $s;</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> s.readings = s.readings + 1;</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">insert</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;">( s );</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">end</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p style=""><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p style=""><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p style=""><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;"># a simple rule to show that it is possible to join</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;"># events from an entry-point (stream) with facts </span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;"># present in the working memory</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">rule</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="green" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: green;">"Update
stock stats"</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">agenda-group</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="green" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: green;">"evaluation"</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">lock-on-active</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">when</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> $cp : Company( $sb : symbol )</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> $st : StockTick( symbol == $sb, $pr : price ) </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">from</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> entry-point </span></font><font color="green" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: green;">"StockTick stream"</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> $stats : Statistics( symbol == $sb )</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p style=""><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">then</span></font></b><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"> </span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">modify</span></font></b><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;">( $stats ) { readings = readings + 1};</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> System.err.println($stats.symbol + </span></font><font color="green" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: green;">"readings: "</span></font><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> + $stats.readings);</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;">// This shows an
update on working memory facts with data from joined events</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;">//modify( $cp )
{ currentPrice = $pr }</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;">// Although
events are considered immutable, a common pattern is to use a class</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;">// to represent
an event and enrich that event instance with data derived from other
facts/events.</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;">// Bellow we
"enrich" the event instance with the percentual change in the price, </span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;">// based on the
previous price</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;">//modify( $st )
{ delta = $cp.delta }</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;">//modify( $st )
{ readings = 5 }</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p style=""><font color="black" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: black;"> </span></font><font color="olive" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: olive;">//System.out.println($st.delta)</span></font><font face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New";"></span></font></p>
<p><b><font color="#960000" face="Courier New" size="2"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(150, 0, 0); font-weight: bold;">end</span></font></b><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"></span></font></p>
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