/**
* 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.camel.component.aws.swf;
import java.util.concurrent.CancellationException;
import java.util.concurrent.atomic.AtomicReference;
import com.amazonaws.services.simpleworkflow.flow.DataConverter;
import com.amazonaws.services.simpleworkflow.flow.DataConverterException;
import com.amazonaws.services.simpleworkflow.flow.DecisionContext;
import com.amazonaws.services.simpleworkflow.flow.DecisionContextProvider;
import com.amazonaws.services.simpleworkflow.flow.DecisionContextProviderImpl;
import com.amazonaws.services.simpleworkflow.flow.JsonDataConverter;
import com.amazonaws.services.simpleworkflow.flow.WorkflowClock;
import com.amazonaws.services.simpleworkflow.flow.WorkflowException;
import com.amazonaws.services.simpleworkflow.flow.common.WorkflowExecutionUtils;
import com.amazonaws.services.simpleworkflow.flow.core.Promise;
import com.amazonaws.services.simpleworkflow.flow.core.Settable;
import com.amazonaws.services.simpleworkflow.flow.core.TryCatchFinally;
import com.amazonaws.services.simpleworkflow.flow.generic.WorkflowDefinition;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CamelWorkflowDefinition extends WorkflowDefinition {
private static final transient Logger LOGGER = LoggerFactory.getLogger(CamelWorkflowDefinition.class);
private SWFWorkflowConsumer swfWorkflowConsumer;
private DecisionContext decisionContext;
private JsonDataConverter dataConverter;
private final DecisionContextProvider contextProvider = new DecisionContextProviderImpl();
private final WorkflowClock workflowClock = contextProvider.getDecisionContext().getWorkflowClock();
public CamelWorkflowDefinition(SWFWorkflowConsumer swfWorkflowConsumer, DecisionContext decisionContext, JsonDataConverter dataConverter) {
this.swfWorkflowConsumer = swfWorkflowConsumer;
this.decisionContext = decisionContext;
this.dataConverter = dataConverter;
}
@Override
public Promise<String> execute(final String input) throws WorkflowException {
final Settable<String> result = new Settable<String>();
final AtomicReference<Promise> methodResult = new AtomicReference<Promise>();
new TryCatchFinally() {
@Override
protected void doTry() throws Throwable {
Object[] parameters = dataConverter.fromData(input, Object[].class);
long startTime = workflowClock.currentTimeMillis();
boolean replaying = contextProvider.getDecisionContext().getWorkflowClock().isReplaying();
LOGGER.debug("Processing workflow execute");
Object r = swfWorkflowConsumer.processWorkflow(parameters, startTime, replaying);
if (r instanceof Promise) {
methodResult.set((Promise) r);
} else if (r != null) {
methodResult.set(new Settable(r));
}
}
@Override
protected void doCatch(Throwable e) throws Throwable {
if (!(e instanceof CancellationException) || !decisionContext.getWorkflowContext().isCancelRequested()) {
throwWorkflowException(dataConverter, e);
}
}
@Override
protected void doFinally() throws Throwable {
Promise r = methodResult.get();
if (r == null || r.isReady()) {
Object workflowResult = r == null ? null : r.get();
String convertedResult = dataConverter.toData(workflowResult);
result.set(convertedResult);
}
}
};
return result;
}
@Override
public void signalRecieved(String signalName, String input) throws WorkflowException {
Object[] parameters = dataConverter.fromData(input, Object[].class);
try {
LOGGER.debug("Processing workflow signalRecieved");
swfWorkflowConsumer.signalRecieved(parameters);
} catch (Throwable e) {
throwWorkflowException(dataConverter, e);
throw new IllegalStateException("Unreacheable");
}
}
@Override
public String getWorkflowState() throws WorkflowException {
try {
LOGGER.debug("Processing workflow getWorkflowState");
Object result = swfWorkflowConsumer.getWorkflowState(null);
return dataConverter.toData(result);
} catch (Throwable e) {
throwWorkflowException(dataConverter, e);
throw new IllegalStateException("Unreachable");
}
}
private void throwWorkflowException(DataConverter c, Throwable exception) throws WorkflowException {
if (exception instanceof WorkflowException) {
throw (WorkflowException) exception;
}
String reason = WorkflowExecutionUtils.truncateReason(exception.getMessage());
String details = null;
try {
details = c.toData(exception);
} catch (DataConverterException dataConverterException) {
if (dataConverterException.getCause() == null) {
dataConverterException.initCause(exception);
}
throw dataConverterException;
}
throw new WorkflowException(reason, details);
}
}