public void process(Exchange exchange) throws Exception {
if (executor == null) {
executor =
exchange
.getContext()
.getExecutorServiceManager()
.newFixedThreadPool(this, "CLAIM-CHECK", 4);
}
String id = tag.evaluate(exchange, String.class);
exchange.setProperty(ClaimCheck.CLAIMCHECK_TAG_HEADER, id);
final Producer conveyor = findDestination(exchange).createProducer();
final Exchange baggage = ExchangeHelper.createCorrelatedCopy(exchange, false);
LOG.info("Checking in 'baggage'");
executor.submit(
new Callable<Exchange>() {
public Exchange call() throws Exception {
try {
LOG.debug("[claimcheck] {} {}", conveyor, baggage);
conveyor.process(baggage);
} catch (Throwable e) {
LOG.warn(
"Error occurred during processing " + baggage + " checked in at " + conveyor, e);
}
return baggage;
};
});
LOG.info("Continue normal flow without 'baggage'");
Message out = exchange.getOut();
out.setBody(value.evaluate(exchange, Object.class));
}
@Override
public Object convert(
Object existingDestinationFieldValue,
Object sourceFieldValue,
Class<?> destinationClass,
Class<?> sourceClass) {
try {
if (currentExchange.get() == null) {
throw new IllegalStateException("Current exchange has not been set for ExpressionMapper");
}
Expression exp;
// Resolve the language being used for this expression and evaluate
Exchange exchange = currentExchange.get();
Language expLang = exchange.getContext().resolveLanguage(getLanguagePart());
String scheme = getSchemePart();
if (scheme != null
&& (scheme.equalsIgnoreCase("classpath")
|| scheme.equalsIgnoreCase("file")
|| scheme.equalsIgnoreCase("http"))) {
String path = getPathPart();
try {
exp = expLang.createExpression(resolveScript(scheme + ":" + path));
} catch (IOException e) {
throw new IllegalStateException("Expression script specified but not found", e);
}
} else {
exp = expLang.createExpression(getExpressionPart());
}
return exp.evaluate(exchange, destinationClass);
} finally {
done();
}
}
public void testCamelContextPropertiesExpression() throws Exception {
camelContext.getProperties().put("CamelTestKey", "CamelTestValue");
Expression expression = camelContextPropertyExpression("CamelTestKey");
assertExpression(expression, exchange, "CamelTestValue");
expression = camelContextPropertiesExpression();
Map<?, ?> properties = expression.evaluate(exchange, Map.class);
assertEquals("Get a wrong properties size", properties.size(), 1);
}
/** Evaluate using classic parameter binding using the pre compute expression */
private Object evaluateParameterBinding(
Exchange exchange, Expression expression, int index, Class<?> parameterType) {
Object answer = null;
// use object first to avoid type conversion so we know if there is a value or not
Object result = expression.evaluate(exchange, Object.class);
if (result != null) {
try {
if (parameterType.isInstance(result)) {
// optimize if the value is already the same type
answer = result;
} else {
// we got a value now try to convert it to the expected type
answer =
exchange.getContext().getTypeConverter().mandatoryConvertTo(parameterType, result);
}
if (LOG.isTraceEnabled()) {
LOG.trace(
"Parameter #{} evaluated as: {} type: ",
new Object[] {index, answer, ObjectHelper.type(answer)});
}
} catch (NoTypeConversionAvailableException e) {
if (LOG.isDebugEnabled()) {
LOG.debug(
"Cannot convert from type: {} to type: {} for parameter #{}",
new Object[] {ObjectHelper.type(result), parameterType, index});
}
throw new ParameterBindingException(e, method, index, parameterType, result);
}
} else {
LOG.trace("Parameter #{} evaluated as null", index);
}
return answer;
}
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
// use atomic integer to be able to pass reference and keep track on the values
AtomicInteger index = new AtomicInteger();
AtomicInteger count = new AtomicInteger();
// Intermediate conversion to String is needed when direct conversion to Integer is not
// available
// but evaluation result is a textual representation of a numeric value.
String text = expression.evaluate(exchange, String.class);
try {
int num = ExchangeHelper.convertToMandatoryType(exchange, Integer.class, text);
count.set(num);
} catch (NoTypeConversionAvailableException e) {
exchange.setException(e);
callback.done(true);
return true;
}
// we hold on to the original Exchange in case it's needed for copies
final Exchange original = exchange;
// per-iteration exchange
Exchange target = exchange;
// set the size before we start
exchange.setProperty(Exchange.LOOP_SIZE, count);
// loop synchronously
while (index.get() < count.get()) {
// and prepare for next iteration
// if (!copy) target = exchange; else copy of original
target = prepareExchange(exchange, index.get(), original);
boolean sync = process(target, callback, index, count, original);
if (!sync) {
LOG.trace(
"Processing exchangeId: {} is continued being processed asynchronously",
target.getExchangeId());
// the remainder of the routing slip will be completed async
// so we break out now, then the callback will be invoked which then continue routing from
// where we left here
return false;
}
LOG.trace(
"Processing exchangeId: {} is continued being processed synchronously",
target.getExchangeId());
// increment counter before next loop
index.getAndIncrement();
}
// we are done so prepare the result
ExchangeHelper.copyResults(exchange, target);
LOG.trace("Processing complete for exchangeId: {} >>> {}", exchange.getExchangeId(), exchange);
callback.done(true);
return true;
}
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
try {
Object newBody = expression.evaluate(exchange, Object.class);
if (exchange.getException() != null) {
// the expression threw an exception so we should break-out
callback.done(true);
return true;
}
boolean out = exchange.hasOut();
Message old = out ? exchange.getOut() : exchange.getIn();
// create a new message container so we do not drag specialized message objects along
// but that is only needed if the old message is a specialized message
boolean copyNeeded = !(old.getClass().equals(DefaultMessage.class));
if (copyNeeded) {
Message msg = new DefaultMessage();
msg.copyFrom(old);
msg.setBody(newBody);
// replace message on exchange
ExchangeHelper.replaceMessage(exchange, msg, false);
} else {
// no copy needed so set replace value directly
old.setBody(newBody);
}
} catch (Throwable e) {
exchange.setException(e);
}
callback.done(true);
return true;
}
public String createFileName(Exchange exchange) {
String answer;
// overrule takes precedence
Object value;
Object overrule = exchange.getIn().getHeader(Exchange.OVERRULE_FILE_NAME);
if (overrule != null) {
if (overrule instanceof Expression) {
value = overrule;
} else {
value =
exchange.getContext().getTypeConverter().convertTo(String.class, exchange, overrule);
}
} else {
value = exchange.getIn().getHeader(Exchange.FILE_NAME);
}
// if we have an overrule then override the existing header to use the overrule computed name
// from this point forward
if (overrule != null) {
exchange.getIn().setHeader(Exchange.FILE_NAME, value);
}
if (value != null
&& value instanceof String
&& StringHelper.hasStartToken((String) value, "simple")) {
log.warn(
"Simple expression: {} detected in header: {} of type String. This feature has been removed (see CAMEL-6748).",
value,
Exchange.FILE_NAME);
}
// expression support
Expression expression = endpoint.getFileName();
if (value != null && value instanceof Expression) {
expression = (Expression) value;
}
// evaluate the name as a String from the value
String name;
if (expression != null) {
log.trace("Filename evaluated as expression: {}", expression);
name = expression.evaluate(exchange, String.class);
} else {
name = exchange.getContext().getTypeConverter().convertTo(String.class, exchange, value);
}
// flatten name
if (name != null && endpoint.isFlatten()) {
// check for both windows and unix separators
int pos = Math.max(name.lastIndexOf("/"), name.lastIndexOf("\\"));
if (pos != -1) {
name = name.substring(pos + 1);
}
}
// compute path by adding endpoint starting directory
String endpointPath = endpoint.getConfiguration().getDirectory();
String baseDir = "";
if (endpointPath.length() > 0) {
// Its a directory so we should use it as a base path for the filename
// If the path isn't empty, we need to add a trailing / if it isn't already there
baseDir = endpointPath;
boolean trailingSlash = endpointPath.endsWith("/") || endpointPath.endsWith("\\");
if (!trailingSlash) {
baseDir += getFileSeparator();
}
}
if (name != null) {
answer = baseDir + name;
} else {
// use a generated filename if no name provided
answer = baseDir + endpoint.getGeneratedFileName(exchange.getIn());
}
if (endpoint.getConfiguration().needToNormalize()) {
// must normalize path to cater for Windows and other OS
answer = normalizePath(answer);
}
return answer;
}
/**
* Evaluate using parameter values where the values can be provided in the method name syntax.
*
* <p>This methods returns accordingly:
*
* <ul>
* <li><tt>null</tt> - if not a parameter value
* <li><tt>Void.TYPE</tt> - if an explicit null, forcing Camel to pass in <tt>null</tt> for
* that given parameter
* <li>a non <tt>null</tt> value - if the parameter was a parameter value, and to be used
* </ul>
*
* @since 2.9
*/
private Object evaluateParameterValue(
Exchange exchange, int index, Object parameterValue, Class<?> parameterType) {
Object answer = null;
// convert the parameter value to a String
String exp =
exchange
.getContext()
.getTypeConverter()
.convertTo(String.class, exchange, parameterValue);
if (exp != null) {
// check if its a valid parameter value
boolean valid = BeanHelper.isValidParameterValue(exp);
if (!valid) {
// it may be a parameter type instead, and if so, then we should return null,
// as this method is only for evaluating parameter values
Boolean isClass =
BeanHelper.isAssignableToExpectedType(
exchange.getContext().getClassResolver(), exp, parameterType);
// the method will return a non null value if exp is a class
if (isClass != null) {
return null;
}
}
// use simple language to evaluate the expression, as it may use the simple language to
// refer to message body, headers etc.
Expression expression = null;
try {
expression = exchange.getContext().resolveLanguage("simple").createExpression(exp);
parameterValue = expression.evaluate(exchange, Object.class);
// use "null" to indicate the expression returned a null value which is a valid response
// we need to honor
if (parameterValue == null) {
parameterValue = "null";
}
} catch (Exception e) {
throw new ExpressionEvaluationException(
expression,
"Cannot create/evaluate simple expression: "
+ exp
+ " to be bound to parameter at index: "
+ index
+ " on method: "
+ getMethod(),
exchange,
e);
}
// special for explicit null parameter values (as end users can explicit indicate they want
// null as parameter)
// see method javadoc for details
if ("null".equals(parameterValue)) {
return Void.TYPE;
}
// the parameter value may match the expected type, then we use it as-is
if (parameterType.isAssignableFrom(parameterValue.getClass())) {
valid = true;
} else {
// the parameter value was not already valid, but since the simple language have evaluated
// the expression
// which may change the parameterValue, so we have to check it again to see if its now
// valid
exp = exchange.getContext().getTypeConverter().tryConvertTo(String.class, parameterValue);
// String values from the simple language is always valid
if (!valid) {
// re validate if the parameter was not valid the first time (String values should be
// accepted)
valid = parameterValue instanceof String || BeanHelper.isValidParameterValue(exp);
}
}
if (valid) {
// we need to unquote String parameters, as the enclosing quotes is there to denote a
// parameter value
if (parameterValue instanceof String) {
parameterValue = StringHelper.removeLeadingAndEndingQuotes((String) parameterValue);
}
if (parameterValue != null) {
try {
// its a valid parameter value, so convert it to the expected type of the parameter
answer =
exchange
.getContext()
.getTypeConverter()
.mandatoryConvertTo(parameterType, exchange, parameterValue);
if (LOG.isTraceEnabled()) {
LOG.trace(
"Parameter #{} evaluated as: {} type: ",
new Object[] {index, answer, ObjectHelper.type(answer)});
}
} catch (Exception e) {
if (LOG.isDebugEnabled()) {
LOG.debug(
"Cannot convert from type: {} to type: {} for parameter #{}",
new Object[] {ObjectHelper.type(parameterValue), parameterType, index});
}
throw new ParameterBindingException(e, method, index, parameterType, parameterValue);
}
}
}
}
return answer;
}
public MethodInvocation createMethodInvocation(final Object pojo, final Exchange exchange) {
final Object[] arguments = parametersExpression.evaluate(exchange, Object[].class);
return new MethodInvocation() {
public Method getMethod() {
return method;
}
public Object[] getArguments() {
return arguments;
}
public boolean proceed(AsyncCallback callback) {
Object body = exchange.getIn().getBody();
if (body != null && body instanceof StreamCache) {
// ensure the stream cache is reset before calling the method
((StreamCache) body).reset();
}
try {
return doProceed(callback);
} catch (InvocationTargetException e) {
exchange.setException(e.getTargetException());
callback.done(true);
return true;
} catch (Throwable e) {
exchange.setException(e);
callback.done(true);
return true;
}
}
private boolean doProceed(AsyncCallback callback) throws Exception {
// dynamic router should be invoked beforehand
if (dynamicRouter != null) {
if (!dynamicRouter.isStarted()) {
ServiceHelper.startService(dynamicRouter);
}
// use a expression which invokes the method to be used by dynamic router
Expression expression = new DynamicRouterExpression(pojo);
return dynamicRouter.doRoutingSlip(exchange, expression, callback);
}
// invoke pojo
if (LOG.isTraceEnabled()) {
LOG.trace(
">>>> invoking: {} on bean: {} with arguments: {} for exchange: {}",
new Object[] {method, pojo, asString(arguments), exchange});
}
Object result = invoke(method, pojo, arguments, exchange);
if (recipientList != null) {
// ensure its started
if (!recipientList.isStarted()) {
ServiceHelper.startService(recipientList);
}
return recipientList.sendToRecipientList(exchange, result, callback);
}
if (routingSlip != null) {
if (!routingSlip.isStarted()) {
ServiceHelper.startService(routingSlip);
}
return routingSlip.doRoutingSlip(exchange, result, callback);
}
// If it's Java 8 async result
if (CompletionStage.class.isAssignableFrom(getMethod().getReturnType())) {
CompletionStage<?> completionStage = (CompletionStage<?>) result;
completionStage.whenComplete(
(resultObject, e) -> {
if (e != null) {
exchange.setException(e);
} else if (resultObject != null) {
fillResult(exchange, resultObject);
}
callback.done(false);
});
return false;
}
// if the method returns something then set the value returned on the Exchange
if (!getMethod().getReturnType().equals(Void.TYPE) && result != Void.TYPE) {
fillResult(exchange, result);
}
// we did not use any of the eips, but just invoked the bean
// so notify the callback we are done synchronously
callback.done(true);
return true;
}
public Object getThis() {
return pojo;
}
public AccessibleObject getStaticPart() {
return method;
}
};
}
public <T> T evaluate(Exchange exchange, Class<T> type) {
if (expression == null) {
expression = createExpression(exchange);
}
return expression.evaluate(exchange, type);
}
/**
* Enriches the input data (<code>exchange</code>) by first obtaining additional data from an
* endpoint represented by an endpoint <code>producer</code> and second by aggregating input data
* and additional data. Aggregation of input data and additional data is delegated to an {@link
* org.apache.camel.processor.aggregate.AggregationStrategy} object set at construction time. If
* the message exchange with the resource endpoint fails then no aggregation will be done and the
* failed exchange content is copied over to the original message exchange.
*
* @param exchange input data.
*/
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
try {
preCheckPoll(exchange);
} catch (Exception e) {
exchange.setException(new CamelExchangeException("Error during pre poll check", exchange, e));
callback.done(true);
return true;
}
// which consumer to use
PollingConsumer consumer;
Endpoint endpoint;
// use dynamic endpoint so calculate the endpoint to use
Object recipient = null;
try {
recipient = expression.evaluate(exchange, Object.class);
endpoint = resolveEndpoint(exchange, recipient);
// acquire the consumer from the cache
consumer = consumerCache.acquirePollingConsumer(endpoint);
} catch (Throwable e) {
if (isIgnoreInvalidEndpoint()) {
if (LOG.isDebugEnabled()) {
LOG.debug(
"Endpoint uri is invalid: " + recipient + ". This exception will be ignored.", e);
}
} else {
exchange.setException(e);
}
callback.done(true);
return true;
}
Exchange resourceExchange;
try {
if (timeout < 0) {
LOG.debug("Consumer receive: {}", consumer);
resourceExchange = consumer.receive();
} else if (timeout == 0) {
LOG.debug("Consumer receiveNoWait: {}", consumer);
resourceExchange = consumer.receiveNoWait();
} else {
LOG.debug("Consumer receive with timeout: {} ms. {}", timeout, consumer);
resourceExchange = consumer.receive(timeout);
}
if (resourceExchange == null) {
LOG.debug("Consumer received no exchange");
} else {
LOG.debug("Consumer received: {}", resourceExchange);
}
} catch (Exception e) {
exchange.setException(new CamelExchangeException("Error during poll", exchange, e));
callback.done(true);
return true;
} finally {
// return the consumer back to the cache
consumerCache.releasePollingConsumer(endpoint, consumer);
}
try {
if (!isAggregateOnException() && (resourceExchange != null && resourceExchange.isFailed())) {
// copy resource exchange onto original exchange (preserving pattern)
copyResultsPreservePattern(exchange, resourceExchange);
} else {
prepareResult(exchange);
// prepare the exchanges for aggregation
ExchangeHelper.prepareAggregation(exchange, resourceExchange);
// must catch any exception from aggregation
Exchange aggregatedExchange = aggregationStrategy.aggregate(exchange, resourceExchange);
if (aggregatedExchange != null) {
// copy aggregation result onto original exchange (preserving pattern)
copyResultsPreservePattern(exchange, aggregatedExchange);
// handover any synchronization
if (resourceExchange != null) {
resourceExchange.handoverCompletions(exchange);
}
}
}
// set header with the uri of the endpoint enriched so we can use that for tracing etc
if (exchange.hasOut()) {
exchange.getOut().setHeader(Exchange.TO_ENDPOINT, consumer.getEndpoint().getEndpointUri());
} else {
exchange.getIn().setHeader(Exchange.TO_ENDPOINT, consumer.getEndpoint().getEndpointUri());
}
} catch (Throwable e) {
exchange.setException(
new CamelExchangeException("Error occurred during aggregation", exchange, e));
callback.done(true);
return true;
}
callback.done(true);
return true;
}
