src/main/java/net/pterodactylus/rhynodge/engine/Engine.java

   1 /*
   2  * Rhynodge - Engine.java - Copyright © 2013 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.rhynodge.engine;
  19
  20 import static java.lang.System.currentTimeMillis;
  21 import static java.util.concurrent.TimeUnit.MILLISECONDS;
  22
  23 import java.util.Map;
  24 import java.util.Optional;
  25 import java.util.concurrent.ConcurrentHashMap;
  26 import java.util.concurrent.Future;
  27 import java.util.concurrent.ScheduledExecutorService;
  28 import java.util.concurrent.ScheduledFuture;
  29 import java.util.concurrent.ScheduledThreadPoolExecutor;
  30
  31 import net.pterodactylus.rhynodge.Reaction;
  32 import net.pterodactylus.rhynodge.actions.EmailAction;
  33 import net.pterodactylus.rhynodge.states.StateManager;
  34
  35 /**
  36  * Rhynodge main engine.
  37  *
  38  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  39  */
  40 public class Engine {
  41
  42         private final StateManager stateManager;
  43         private final ScheduledExecutorService executorService;
  44         private final Map<String, Future<?>> scheduledFutures = new ConcurrentHashMap<>();
  45         private final EmailAction errorEmailAction;
  46
  47         public Engine(StateManager stateManager, EmailAction errorEmailAction) {
  48                 this.stateManager = stateManager;
  49                 this.errorEmailAction = errorEmailAction;
  50                 executorService = new ScheduledThreadPoolExecutor(10);
  51         }
  52
  53         //
  54         // ACCESSORS
  55         //
  56
  57         /**
  58          * Adds the given reaction to this engine.
  59          *
  60          * @param name
  61          *              The name of the reaction
  62          * @param reaction
  63          *              The reaction to add to this engine
  64          */
  65         public void addReaction(String name, Reaction reaction) {
  66                 ReactionState reactionState = new ReactionState(stateManager, name);
  67                 Optional<net.pterodactylus.rhynodge.State> lastState = reactionState.loadLastState();
  68                 long lastExecutionTime = lastState.map(net.pterodactylus.rhynodge.State::time).orElse(0L);
  69                 long nextExecutionTime = lastExecutionTime + reaction.updateInterval();
  70                 ReactionRunner reactionRunner = new ReactionRunner(reaction, reactionState, errorEmailAction);
  71                 ScheduledFuture<?> future = executorService.scheduleWithFixedDelay(reactionRunner, nextExecutionTime - currentTimeMillis(), reaction.updateInterval(), MILLISECONDS);
  72                 scheduledFutures.put(name, future);
  73         }
  74
  75         /**
  76          * Removes the reaction with the given name.
  77          *
  78          * @param name
  79          *              The name of the reaction to remove
  80          */
  81         public void removeReaction(String name) {
  82                 if (!scheduledFutures.containsKey(name)) {
  83                         return;
  84                 }
  85                 scheduledFutures.remove(name).cancel(true);
  86         }
  87
  88 }