/*
* Copyright 2014 Groupon, Inc
*
* Groupon 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.killbill.automaton;
import java.net.URI;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlID;
import org.killbill.xmlloader.ValidationErrors;
@XmlAccessorType(XmlAccessType.NONE)
public class DefaultState extends StateMachineValidatingConfig<DefaultStateMachineConfig> implements State {
@XmlAttribute(required = true)
@XmlID
private String name;
private DefaultStateMachine stateMachine;
@Override
public void initialize(final DefaultStateMachineConfig root, final URI uri) {
}
@Override
public ValidationErrors validate(final DefaultStateMachineConfig root, final ValidationErrors errors) {
return errors;
}
@Override
public String getName() {
return name;
}
@Override
public void runOperation(final Operation operation, final Operation.OperationCallback operationCallback, final EnteringStateCallback enteringStateCallback, final LeavingStateCallback leavingStateCallback)
throws MissingEntryException, OperationException {
OperationException rethrowableException = null;
OperationResult result = OperationResult.EXCEPTION;
Transition transition = null;
State initialState = this;
try {
final StateMachine destStateMachine = operation.getStateMachine();
try {
final LinkStateMachine linkStateMachine = DefaultLinkStateMachine.findLinkStateMachine(this.getStateMachine(), this, destStateMachine);
initialState = linkStateMachine.getFinalState();
} catch (final MissingEntryException e) {
initialState = this;
}
// If there is no transition from that state, we stop right there
if (!((DefaultState) initialState).getStateMachine().hasTransitionsFromStates(initialState.getName())) {
throw new MissingEntryException("No transition exists from state " + initialState.getName());
}
// If there is no enteringState transition regardless of the operation outcome, we stop right there
boolean hasAtLeastOneEnteringStateTransition = false;
for (final OperationResult operationResult : OperationResult.values()) {
try {
DefaultTransition.findTransition(initialState, operation, operationResult);
hasAtLeastOneEnteringStateTransition = true;
break;
} catch (final MissingEntryException ignored) {
}
}
if (!hasAtLeastOneEnteringStateTransition) {
throw new MissingEntryException("No entering state transition exists from state " + initialState.getName() + " for operation " + operation.getName());
}
leavingStateCallback.leavingState(initialState);
result = operation.run(operationCallback);
transition = DefaultTransition.findTransition(initialState, operation, result);
} catch (final OperationException e) {
rethrowableException = e;
// STEPH what happens if we get an exception here...
transition = DefaultTransition.findTransition(initialState, operation, e.getOperationResult());
} catch (final RuntimeException e) {
rethrowableException = new OperationException(e);
// transition = null - we don't want to transition
} finally {
if (transition != null) {
enteringStateCallback.enteringState(transition.getFinalState(), operationCallback, result, leavingStateCallback);
}
if (rethrowableException != null) {
throw rethrowableException;
}
}
}
public void setName(final String name) {
this.name = name;
}
public DefaultStateMachine getStateMachine() {
return stateMachine;
}
public void setStateMachine(final DefaultStateMachine stateMachine) {
this.stateMachine = stateMachine;
}
}