| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.ode.bpel.runtime; |
| |
| import org.apache.ode.bpel.common.FaultException; |
| import org.apache.ode.bpel.explang.EvaluationContext; |
| import org.apache.ode.bpel.explang.EvaluationException; |
| import org.apache.ode.bpel.o.OEventHandler; |
| import org.apache.ode.bpel.o.OScope; |
| import org.apache.ode.bpel.runtime.channels.EventHandlerControlChannel; |
| import org.apache.ode.bpel.runtime.channels.EventHandlerControlChannelListener; |
| import org.apache.ode.bpel.runtime.channels.FaultData; |
| import org.apache.ode.bpel.runtime.channels.ParentScopeChannel; |
| import org.apache.ode.bpel.runtime.channels.ParentScopeChannelListener; |
| import org.apache.ode.bpel.runtime.channels.TerminationChannel; |
| import org.apache.ode.bpel.runtime.channels.TerminationChannelListener; |
| import org.apache.ode.bpel.runtime.channels.TimerResponseChannel; |
| import org.apache.ode.bpel.runtime.channels.TimerResponseChannelListener; |
| import org.apache.ode.jacob.SynchChannel; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import java.util.Calendar; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.Date; |
| |
| import org.w3c.dom.Element; |
| |
| /** |
| * Alarm event handler. This process template manages a single alarm event handler. |
| * It acts like an activity in that it can be terminated, but also adds a channel for |
| * "soft" termination (aka stopping) to deal with the case when the scope that owns |
| * the event handler completes naturally. |
| */ |
| class EH_ALARM extends BpelJacobRunnable { |
| |
| private static final Log __log = LogFactory.getLog(EH_ALARM.class); |
| |
| private static final long serialVersionUID = 1L; |
| |
| private ParentScopeChannel _psc; |
| private TerminationChannel _tc; |
| private OEventHandler.OAlarm _oalarm; |
| private ScopeFrame _scopeFrame; |
| private EventHandlerControlChannel _cc; |
| private Set<CompensationHandler> _comps = new HashSet<CompensationHandler>(); |
| |
| /** |
| * Concretion constructor. |
| * @param psc a link to our parent. |
| * @param tc channel we listen on for termination requests |
| * @param cc channel we listen on for "stop" requests |
| * @param o our prototype / compiled representation |
| * @param scopeFrame the {@link ScopeFrame} in which we are executing |
| */ |
| EH_ALARM(ParentScopeChannel psc, TerminationChannel tc, EventHandlerControlChannel cc, OEventHandler.OAlarm o, ScopeFrame scopeFrame) { |
| _psc = psc; |
| _tc = tc; |
| _cc = cc; |
| _scopeFrame = scopeFrame; |
| _oalarm = o; |
| } |
| |
| public void run() { |
| |
| Calendar alarm = Calendar.getInstance(); |
| |
| if (_oalarm.forExpr != null) |
| try { |
| getBpelRuntimeContext().getExpLangRuntime().evaluateAsDuration(_oalarm.forExpr, getEvaluationContext()).addTo(alarm); |
| } catch (EvaluationException e) { |
| throw new InvalidProcessException(e); |
| } catch (FaultException e) { |
| __log.error(e); |
| _psc.completed(createFault(e.getQName(),_oalarm.forExpr), _comps); |
| return; |
| } |
| else if (_oalarm.untilExpr != null) |
| try { |
| alarm.setTime(getBpelRuntimeContext().getExpLangRuntime().evaluateAsDate(_oalarm.untilExpr, getEvaluationContext()).getTime()); |
| } catch (EvaluationException e) { |
| throw new InvalidProcessException(e); |
| } catch (FaultException e) { |
| __log.error(e); |
| _psc.completed(createFault(e.getQName(),_oalarm.untilExpr), _comps); |
| return; |
| } |
| |
| // We reduce to waiting for the alarm to be triggered. |
| instance(new WAIT(alarm)); |
| } |
| |
| protected EvaluationContext getEvaluationContext() { |
| return new ExprEvaluationContextImpl(_scopeFrame,getBpelRuntimeContext()); |
| } |
| |
| /** |
| * Template used to wait until a given time, reduing to a {@link FIRE} after the |
| * elapsed time. This template also monitors the termination and event-control channels |
| * for requests from parent. |
| */ |
| private class WAIT extends BpelJacobRunnable { |
| private static final long serialVersionUID = -1426724996925898213L; |
| Calendar _alarm; |
| |
| /** |
| * Concretion constructor. |
| * @param alarm date at which time to fire |
| */ |
| WAIT(Calendar alarm) { |
| _alarm = alarm; |
| } |
| |
| public void run() { |
| Calendar now = Calendar.getInstance(); |
| |
| if (now.before(_alarm)) { |
| TimerResponseChannel trc = newChannel(TimerResponseChannel.class); |
| getBpelRuntimeContext().registerTimer(trc,_alarm.getTime()); |
| object(false,new TimerResponseChannelListener(trc){ |
| private static final long serialVersionUID = 1110683632756756017L; |
| |
| public void onTimeout() { |
| // This is what we are waiting for, fire the activity |
| instance(new FIRE()); |
| } |
| |
| public void onCancel() { |
| _psc.completed(null, _comps); |
| } |
| }.or(new EventHandlerControlChannelListener(_cc) { |
| private static final long serialVersionUID = -7750428941445331236L; |
| |
| public void stop() { |
| _psc.completed(null, _comps); |
| } |
| |
| }.or(new TerminationChannelListener(_tc) { |
| private static final long serialVersionUID = 6100105997983514609L; |
| |
| public void terminate() { |
| _psc.completed(null, _comps); |
| } |
| }))); |
| } else /* now is later then alarm time */ { |
| // If the alarm has passed we fire the nested activity |
| ActivityInfo child = new ActivityInfo(genMonotonic(), |
| _oalarm.activity, |
| newChannel(TerminationChannel.class), newChannel(ParentScopeChannel.class)); |
| instance(createChild(child, _scopeFrame, new LinkFrame(null) )); |
| instance(new ACTIVE(child)); |
| } |
| |
| } |
| } |
| |
| /** |
| * Snipped that fires the alarm activity. |
| */ |
| private class FIRE extends BpelJacobRunnable { |
| private static final long serialVersionUID = -7261315204412433250L; |
| |
| public void run() { |
| // Start the child activity. |
| ActivityInfo child = new ActivityInfo(genMonotonic(), |
| _oalarm.activity, |
| newChannel(TerminationChannel.class), newChannel(ParentScopeChannel.class)); |
| instance(createChild(child, _scopeFrame, new LinkFrame(null) )); |
| instance(new ACTIVE(child)); |
| } |
| } |
| |
| /** |
| * Snippet that is used to monitor a running activity. |
| */ |
| private class ACTIVE extends BpelJacobRunnable { |
| private static final long serialVersionUID = -2166253425722769701L; |
| |
| private ActivityInfo _activity; |
| |
| /** Indicates whether our parent has requested a stop. */ |
| private boolean _stopped = false; |
| |
| ACTIVE(ActivityInfo activity) { |
| _activity = activity; |
| } |
| |
| public void run() { |
| object(false,new ParentScopeChannelListener(_activity.parent){ |
| private static final long serialVersionUID = -3357030137175178040L; |
| |
| public void compensate(OScope scope, SynchChannel ret) { |
| _psc.compensate(scope,ret); |
| instance(ACTIVE.this); |
| } |
| |
| public void completed(FaultData faultData, Set<CompensationHandler> compensations) { |
| _comps.addAll(compensations); |
| if (!_stopped && _oalarm.repeatExpr != null) { |
| Calendar next = Calendar.getInstance(); |
| try { |
| getBpelRuntimeContext().getExpLangRuntime().evaluateAsDuration(_oalarm.repeatExpr, getEvaluationContext()).addTo(next); |
| } catch (EvaluationException e) { |
| throw new InvalidProcessException(e); |
| } catch (FaultException e) { |
| __log.error(e); |
| _psc.completed(createFault(e.getQName(),_oalarm.forExpr), _comps); |
| return; |
| } |
| instance(new WAIT(next)); |
| } else { |
| _psc.completed(faultData, _comps); |
| } |
| } |
| |
| public void cancelled() { completed(null, CompensationHandler.emptySet()); } |
| public void failure(String reason, Element data) { completed(null, CompensationHandler.emptySet()); } |
| }.or(new EventHandlerControlChannelListener(_cc) { |
| private static final long serialVersionUID = -3873619538789039424L; |
| |
| public void stop() { |
| _stopped = true; |
| instance(ACTIVE.this); |
| } |
| |
| }.or(new TerminationChannelListener(_tc) { |
| private static final long serialVersionUID = -4566956567870652885L; |
| |
| public void terminate() { |
| replication(_activity.self).terminate(); |
| _stopped = true; |
| instance(ACTIVE.this); |
| } |
| }))); |
| |
| } |
| } |
| } |