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/*
* The MIT License
*
* Copyright 2017 michael.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package il.ac.bgu.cs.bp.bpjs.execution;
import il.ac.bgu.cs.bp.bpjs.exceptions.BPjsRuntimeException;
import il.ac.bgu.cs.bp.bpjs.model.BProgram;
import il.ac.bgu.cs.bp.bpjs.model.BProgramSyncSnapshot;
import il.ac.bgu.cs.bp.bpjs.model.BEvent;
import il.ac.bgu.cs.bp.bpjs.model.eventselection.EventSelectionResult;
import il.ac.bgu.cs.bp.bpjs.model.eventselection.EventSelectionStrategy;
import java.util.ArrayList;
import static java.util.Collections.reverseOrder;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import il.ac.bgu.cs.bp.bpjs.execution.listeners.BProgramRunnerListener;
import il.ac.bgu.cs.bp.bpjs.internal.ExecutorServiceMaker;
import il.ac.bgu.cs.bp.bpjs.model.FailedAssertion;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Runs a {@link BProgram} to completion. Uses an {@link EventSelectionStrategy}
* to select which event to choose at each point.
*
* @author michael
*/
public class BProgramRunner implements Runnable {
private static final AtomicInteger INSTANCE_COUNTER = new AtomicInteger(0);
private final int instanceNum = INSTANCE_COUNTER.incrementAndGet();
private ExecutorService execSvc = null;
private BProgram bprog = null;
private final List listeners = new ArrayList<>();
private FailedAssertion failedAssertion;
private final AtomicBoolean go = new AtomicBoolean(true);
private volatile boolean halted;
public BProgramRunner(){
this(null);
}
public BProgramRunner(BProgram aBProgram) {
bprog = aBProgram;
if ( bprog!=null ) {
bprog.setAddBThreadCallback( (bp,bt)->listeners.forEach(l->l.bthreadAdded(bp, bt)));
}
}
@Override
public void run() {
try {
// setup bprogram and runtime parts.
execSvc = ExecutorServiceMaker.makeWithName("BProgramRunner-" + instanceNum );
failedAssertion = null;
listeners.forEach(l -> l.starting(bprog));
BProgramSyncSnapshot cur = bprog.setup();
cur.getBThreadSnapshots().forEach(sn->listeners.forEach( l -> l.bthreadAdded(bprog, sn)) );
// start it
go.set(true);
halted = false;
listeners.forEach(l -> l.started(bprog));
cur = cur.start(execSvc);
if ( ! cur.isStateValid() ) {
failedAssertion = cur.getFailedAssertion();
listeners.forEach( l->l.assertionFailed(bprog, failedAssertion));
go.set(false);
}
// while snapshot not empty, select an event and get the next snapshot.
while ( (!cur.noBThreadsLeft()) && go.get() ) {
// see which events are selectable
Set possibleEvents = bprog.getEventSelectionStrategy().selectableEvents(cur);
if ( possibleEvents.isEmpty() ) {
// Superstep done: No events available for selection.
if ( bprog.isWaitForExternalEvents() ) {
listeners.forEach( l->l.superstepDone(bprog) );
BEvent next = bprog.takeExternalEvent(); // and now we wait for external event
if ( next == null ) {
go.set(false); // program no longer waits for external events
} else {
cur.getExternalEvents().add(next);
}
} else {
// Ending the program - no selectable event.
listeners.forEach(l->l.superstepDone(bprog));
go.set(false);
}
} else {
// we can select some events - select one and advance.
Optional res = bprog.getEventSelectionStrategy().select(cur, possibleEvents);
if ( res.isPresent() ) {
EventSelectionResult esr = res.get();
if ( ! esr.getIndicesToRemove().isEmpty() ) {
// the event selection affected the external event queue.
List updatedExternals = new ArrayList<>(cur.getExternalEvents());
esr.getIndicesToRemove().stream().sorted(reverseOrder())
.forEach( idxObj -> updatedExternals.remove(idxObj.intValue()) );
cur = cur.copyWith(updatedExternals);
}
listeners.forEach(l->l.eventSelected(bprog, esr.getEvent()));
cur = cur.triggerEvent(esr.getEvent(), execSvc, listeners);
if ( ! cur.isStateValid() ) {
failedAssertion = cur.getFailedAssertion();
listeners.forEach( l->l.assertionFailed(bprog, failedAssertion));
go.set(false);
}
} else {
// edge case: we can select events, but we didn't. Might be a bug in the EventSelectionStrategy.
go.set(false);
}
}
}
if ( halted ) {
listeners.forEach(l->l.halted(bprog));
} else {
listeners.forEach(l->l.ended(bprog));
}
} catch ( BPjsRuntimeException bre ) {
listeners.forEach( l -> l.error(bprog, bre));
} catch (InterruptedException itr) {
System.err.println("BProgramRunner interrupted: " + itr.getMessage() );
} finally {
execSvc.shutdown();
}
}
/**
* Halts the running b-program. The program will terminate on the next
* synchronization point.
*/
public void halt() {
halted=true;
go.set(false);
}
/**
* @return {@code true} iff the program has terminated because of
* a failed assertion, {@code false} otherwise.
*/
public boolean hasFailedAssertion() {
return failedAssertion!=null;
}
public FailedAssertion getFailedAssertion() {
return failedAssertion;
}
public BProgram getBProgram() {
return bprog;
}
public void setBProgram(BProgram aBProgram) {
bprog = aBProgram;
if ( bprog!=null ) {
bprog.setAddBThreadCallback( (bp,bt)->listeners.forEach(l->l.bthreadAdded(bp, bt)));
}
}
/**
* Adds a listener to the BProgram.
* @param Actual type of listener.
* @param aListener the listener to add.
* @return The added listener, to allow call chaining.
*/
public R addListener(R aListener) {
listeners.add(aListener);
return aListener;
}
/**
* Removes the listener from the program. If the listener is not registered,
* this call is ignored. In other words, this call is idempotent.
* @param aListener the listener to remove.
*/
public void removeListener(BProgramRunnerListener aListener) {
listeners.remove(aListener);
}
}
