45 lines
1.8 KiB
Plaintext
45 lines
1.8 KiB
Plaintext
/**
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* This file is part of Rubanetra.
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* Copyright (C) 2013,2014 Stefan Swerk (stefan_rubanetra@swerk.priv.at)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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import at.jku.fim.rubanetra.protocol.activity.*;
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// using the MVEL expression language, see http://mvel.codehaus.org/
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dialect "mvel"
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/**
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* This global variable constitutes the default output writer that is used to write derived facts, i.e. Activity objects,
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* to the final output stream.
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*/
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global at.jku.fim.rubanetra.output.OutputWriterStrategy outputWriter;
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/**
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* This rule will ensure that all encountered OutputActivityEvents will be written to the final output stream,
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* as long as the enclosed Activity 'toOutput' is not null and the global 'outputWriter' exists.
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* The encountered, valid OutputActivityEvent will be retracted afterwards.
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* This behaviour is useful to free memory in case the default event expiration time is not defined or
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* set to a high value.
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*/
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rule "Write to OutputStream (event-based)"
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when
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$outEvent : OutputActivityEvent(toOutput != null)
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then
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if (outputWriter != null) {
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outputWriter.writeActivity($outEvent.getToOutput());
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}
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retract($outEvent);
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end
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