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*
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package org.glassfish.jersey.message.internal;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Iterator;
import java.util.List;
import javax.ws.rs.BadRequestException;
import javax.ws.rs.ProcessingException;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.HttpHeaders;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.NoContentException;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.ReaderInterceptor;
import javax.ws.rs.ext.ReaderInterceptorContext;
import org.glassfish.jersey.internal.LocalizationMessages;
import org.glassfish.jersey.internal.PropertiesDelegate;
import org.glassfish.jersey.message.MessageBodyWorkers;
import com.google.common.collect.Lists;
/**
* Represents reader interceptor chain executor for both client and server side.
* It constructs wrapped interceptor chain and invokes it. At the end of the chain
* a {@link MessageBodyReader message body reader} execution interceptor is inserted,
* which finally reads an entity from the output stream provided by the chain.
*
* @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
*/
public final class ReaderInterceptorExecutor extends InterceptorExecutor
implements ReaderInterceptorContext {
private InputStream inputStream;
private final MultivaluedMap headers;
private final Iterator interceptors;
private int processedCount;
private final MessageBodyWorkers workers;
private final boolean translateNce;
/**
* Constructs a new executor to read given type from provided {@link InputStream entityStream}.
*
* @param rawType raw Java entity type.
* @param type generic Java entity type.
* @param annotations array of annotations on the declaration of the artifact
* that will be initialized with the produced instance. E.g. if the message
* body is to be converted into a method parameter, this will be the annotations
* on that parameter returned by {@code Method.getParameterAnnotations}.
* @param mediaType media type of the HTTP entity.
* @param headers mutable message headers.
* @param propertiesDelegate request-scoped properties delegate.
* @param inputStream entity input stream.
* @param workers {@link MessageBodyWorkers Message body workers}.
* @param readerInterceptors Reader interceptor that are to be used to intercept the reading of an entity.
* The interceptors will be executed in the same order as given in this parameter.
* @param translateNce if {@code true}, the {@link NoContentException} thrown by a selected message body
* reader will be translated into a {@link BadRequestException} as required by
* JAX-RS specification on the server side.
*/
public ReaderInterceptorExecutor(Class rawType, Type type, Annotation[] annotations, MediaType mediaType,
MultivaluedMap headers, PropertiesDelegate propertiesDelegate,
InputStream inputStream, MessageBodyWorkers workers,
Iterable readerInterceptors,
boolean translateNce) {
super(rawType, type, annotations, mediaType, propertiesDelegate);
this.headers = headers;
this.inputStream = inputStream;
this.workers = workers;
this.translateNce = translateNce;
final List effectiveInterceptors = Lists.newArrayList(readerInterceptors);
effectiveInterceptors.add(new TerminalReaderInterceptor());
this.interceptors = effectiveInterceptors.iterator();
this.processedCount = 0;
}
/**
* Starts the interceptor chain execution.
*
* @return an entity read from the stream.
*/
@Override
@SuppressWarnings("unchecked")
public Object proceed() throws IOException {
if (!interceptors.hasNext()) {
throw new ProcessingException(LocalizationMessages.ERROR_INTERCEPTOR_READER_PROCEED());
}
final ReaderInterceptor interceptor = interceptors.next();
traceBefore(interceptor, MsgTraceEvent.RI_BEFORE);
try {
return interceptor.aroundReadFrom(this);
} finally {
processedCount++;
traceAfter(interceptor, MsgTraceEvent.RI_AFTER);
}
}
@Override
public InputStream getInputStream() {
return this.inputStream;
}
@Override
public void setInputStream(InputStream is) {
this.inputStream = is;
}
@Override
public MultivaluedMap getHeaders() {
return headers;
}
/**
* Get number of processed interceptors.
*
* @return number of processed interceptors.
*/
int getProcessedCount() {
return processedCount;
}
/**
* Terminal reader interceptor which choose the appropriate {@link MessageBodyReader}
* and reads the entity from the input stream. The order of actions is the following:
* 1. choose the appropriate {@link MessageBodyReader}
* 3. reads the entity from the output stream
*/
private class TerminalReaderInterceptor implements ReaderInterceptor {
@Override
@SuppressWarnings("unchecked")
public Object aroundReadFrom(ReaderInterceptorContext context) throws IOException, WebApplicationException {
processedCount--; //this is not regular interceptor -> count down
traceBefore(null, MsgTraceEvent.RI_BEFORE);
try {
final TracingLogger tracingLogger = getTracingLogger();
if (tracingLogger.isLogEnabled(MsgTraceEvent.MBR_FIND)) {
tracingLogger.log(MsgTraceEvent.MBR_FIND,
context.getType().getName(),
(context.getGenericType() instanceof Class ?
((Class) context.getGenericType()).getName() : context.getGenericType()),
String.valueOf(context.getMediaType()), java.util.Arrays.toString(context.getAnnotations()));
}
final MessageBodyReader bodyReader = workers.getMessageBodyReader(
context.getType(),
context.getGenericType(),
context.getAnnotations(),
context.getMediaType(),
ReaderInterceptorExecutor.this);
final EntityInputStream input = new EntityInputStream(context.getInputStream());
if (bodyReader == null) {
if (input.isEmpty() && !context.getHeaders().containsKey(HttpHeaders.CONTENT_TYPE)) {
return null;
} else {
throw new MessageBodyProviderNotFoundException(LocalizationMessages.ERROR_NOTFOUND_MESSAGEBODYREADER(
context.getMediaType(), context.getType(), context.getGenericType()));
}
}
Object entity = invokeReadFrom(context, bodyReader, input);
if (bodyReader instanceof CompletableReader) {
entity = ((CompletableReader) bodyReader).complete(entity);
}
return entity;
} finally {
clearLastTracedInterceptor();
traceAfter(null, MsgTraceEvent.RI_AFTER);
}
}
@SuppressWarnings("unchecked")
private Object invokeReadFrom(ReaderInterceptorContext context, MessageBodyReader bodyReader, EntityInputStream input)
throws WebApplicationException, IOException {
final TracingLogger tracingLogger = getTracingLogger();
final long timestamp = tracingLogger.timestamp(MsgTraceEvent.MBR_READ_FROM);
try {
Object entity;
if (translateNce) {
try {
entity = bodyReader.readFrom(context.getType(), context.getGenericType(), context.getAnnotations(),
context.getMediaType(), context.getHeaders(), input);
} catch (NoContentException ex) {
throw new BadRequestException(ex);
}
} else {
entity = bodyReader.readFrom(context.getType(), context.getGenericType(), context.getAnnotations(),
context.getMediaType(), context.getHeaders(), input);
}
return entity;
} finally {
tracingLogger.logDuration(MsgTraceEvent.MBR_READ_FROM, timestamp, bodyReader);
}
}
}
}
