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/*
* The MIT License
*
* Copyright 2017 BGU.
*
* 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.bprogramio;
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.SyncStatement;
import il.ac.bgu.cs.bp.bpjs.model.BThreadSyncSnapshot;
import il.ac.bgu.cs.bp.bpjs.execution.jsproxy.BProgramJsProxy;
import il.ac.bgu.cs.bp.bpjs.model.BEvent;
import il.ac.bgu.cs.bp.bpjs.model.FailedAssertion;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ContextFactory;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.serialize.ScriptableInputStream;
/**
* Serialized and de-serializes {@link BProgramSyncSnapshot}s.
*
* @author michael
*/
public class BProgramSyncSnapshotIO {
private static class Header implements java.io.Serializable {
public Header(int bthreadCount, int externalEventCount, FailedAssertion fa) {
this.bthreadCount = bthreadCount;
this.externalEventCount = externalEventCount;
this.fa = fa;
}
final int bthreadCount;
final int externalEventCount;
final FailedAssertion fa;
}
private final BProgram bprogram;
public BProgramSyncSnapshotIO(BProgram bprogram) {
this.bprogram = bprogram;
}
public byte[] serialize(BProgramSyncSnapshot bpss) throws IOException {
try {
Context ctxt = Context.enter(); // need Javascript environment for
// this, even though we're not
// executing code per se.
final ScriptableObject globalScope = ctxt.initStandardObjects();
try (ByteArrayOutputStream bytes = new ByteArrayOutputStream();
ObjectOutputStream outs = new ObjectOutputStream(bytes)) {
outs.writeObject(new Header(bpss.getBThreadSnapshots().size(), bpss.getExternalEvents().size(), bpss.getFailedAssertion()));
for (BThreadSyncSnapshot bss : bpss.getBThreadSnapshots()) {
writeBThreadSnapshot(bss, outs, globalScope);
}
for (BEvent ee : bpss.getExternalEvents()) {
outs.writeObject(ee);
}
outs.flush();
return bytes.toByteArray();
}
} finally {
Context.exit();
}
}
public BProgramSyncSnapshot deserialize(byte[] bytes) throws IOException, ClassNotFoundException {
try {
Context ctxt = ContextFactory.getGlobal().enterContext();
// must use interpreter mode
ctxt.setOptimizationLevel(-1);
final ScriptableObject globalScope = ctxt.initStandardObjects();
try (ScriptableInputStream sis
= new ScriptableInputStream(new ByteArrayInputStream(bytes), globalScope)) {
Header header = (Header) sis.readObject();
Set bthreads = new HashSet<>(header.bthreadCount);
for (int i = 0; i < header.bthreadCount; i++) {
bthreads.add(readBThreadSnapshot(sis, globalScope));
}
List events = new ArrayList<>(header.externalEventCount);
for (int i = 0; i < header.externalEventCount; i++) {
events.add((BEvent) sis.readObject());
}
return new BProgramSyncSnapshot(bprogram, bthreads, events, header.fa);
}
} finally {
Context.exit();
}
}
public byte[] serializeBThread(BThreadSyncSnapshot btss) {
try {
Context ctxt = Context.enter(); // need Javascript environment for
// this, even though we're not
// executing code per se.
final ScriptableObject globalScope = ctxt.initStandardObjects();
try (ByteArrayOutputStream bytes = new ByteArrayOutputStream();
ObjectOutputStream outs = new ObjectOutputStream(bytes)) {
writeBThreadSnapshot(btss, outs, globalScope);
outs.flush();
return bytes.toByteArray();
} catch (IOException ex) {
// all read/writes are in-memory.
throw new RuntimeException("IO exception serializing a b-thread:"+ex.getMessage(), ex);
}
} finally {
Context.exit();
}
}
public BThreadSyncSnapshot deserializeBThread( byte[] serializedBT ) {
try {
Context ctxt = ContextFactory.getGlobal().enterContext();
// must use interpreter mode
ctxt.setOptimizationLevel(-1);
final ScriptableObject globalScope = ctxt.initStandardObjects();
try (ScriptableInputStream sis
= new ScriptableInputStream(new ByteArrayInputStream(serializedBT), globalScope)) {
return readBThreadSnapshot(sis, globalScope);
} catch (ClassNotFoundException|IOException ex) {
// reading from memory here.
throw new RuntimeException("Error reading a serialized b-thread: " + ex.getMessage(), ex );
}
} finally {
Context.exit();
}
}
private void writeBThreadSnapshot(BThreadSyncSnapshot bss, ObjectOutputStream outs, ScriptableObject scope) throws IOException {
outs.writeObject(bss.getName());
ByteArrayOutputStream bthreadBytes = new ByteArrayOutputStream();
try (BThreadSyncSnapshotOutputStream btos = new BThreadSyncSnapshotOutputStream(bthreadBytes, scope)) {
btos.writeObject(bss.getEntryPoint());
btos.writeObject(bss.getInterrupt().orElse(null));
btos.writeObject(bss.getSyncStatement());
btos.writeObject(bss.getContinuation());
btos.flush();
}
bthreadBytes.flush();
bthreadBytes.close();
outs.writeObject(bthreadBytes.toByteArray());
}
private BThreadSyncSnapshot readBThreadSnapshot(ScriptableInputStream sis, ScriptableObject scope) throws IOException, ClassNotFoundException {
String name = (String) sis.readObject();
byte[] contBytes = (byte[]) sis.readObject();
final BProgramJsProxy bpProxy = new BProgramJsProxy(bprogram);
StubProvider stubPrv = (StreamObjectStub stub) -> {
if (stub == StreamObjectStub.BP_PROXY) {
return bpProxy;
}
throw new IllegalArgumentException("Unknown stub " + stub);
};
try (ByteArrayInputStream inBytes = new ByteArrayInputStream(contBytes);
BThreadSyncSnapshotInputStream bssis = new BThreadSyncSnapshotInputStream(inBytes, scope, stubPrv)) {
Function entryPoint = (Function) bssis.readObject();
Function interruptHandler = (Function) bssis.readObject();
SyncStatement stmt = (SyncStatement) bssis.readObject();
Object cont = bssis.readObject();
final BThreadSyncSnapshot bThreadSyncSnapshot = new BThreadSyncSnapshot(name, entryPoint, interruptHandler, cont, stmt);
return bThreadSyncSnapshot;
}
}
}
