com.sun.jersey.api.client.TerminatingClientHandler Maven / Gradle / Ivy
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package com.sun.jersey.api.client;
import com.sun.jersey.spi.MessageBodyWorkers;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.GenericEntity;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
/**
* A terminating client handler that is invoked to produce an HTTP request
* to send to a resource and process the HTTP response received from the resource.
*
* This class can be extended to integrate HTTP protocol functionality with
* the Client API. Utilitly methods are provided for converting header values
* and writing a request entity.
*
* @author [email protected]
*/
public abstract class TerminatingClientHandler implements ClientHandler {
protected static final Annotation[] EMPTY_ANNOTATIONS = new Annotation[0];
/**
* A lister for listensing to events when writing a request entity.
*
* The listener is registered when invoking the {@link TerminatingClientHandler#writeRequestEntity(com.sun.jersey.api.client.ClientRequest, com.sun.jersey.api.client.WriteRequestEntityListener) }
* method.
*
* @author [email protected]
*/
protected interface RequestEntityWriterListener {
/**
* Called when the size of the request entity is obtained.
*
* Enables the appropriate setting of HTTP headers
* for the size of the request entity and/or configure an appropriate
* transport encoding.
*
* @param size the size, in bytes, of the request entity, otherwise -1
* if the size cannot be determined before serialization.
* @throws java.io.IOException
*/
void onRequestEntitySize(long size) throws IOException;
/**
* Called when the output stream is required to write the request
* entity.
*
* @return the output stream to write the request entity.
* @throws java.io.IOException
*/
OutputStream onGetOutputStream() throws IOException;
}
/**
* A writer for writing a request entity.
*
* An instance of a RequestEntityWriter is obtained by
* invoking the {@link TerminatingClientHandler#getRequestEntityWriter(com.sun.jersey.api.client.ClientRequest) }
* method.
*
*/
protected interface RequestEntityWriter {
/**
*
* @return size the size, in bytes, of the request entity, otherwise -1
* if the size cannot be determined before serialization.
*/
long getSize();
/**
*
* @return the media type of the request entity.
*/
MediaType getMediaType();
/**
* Write the request entity.
*
* @param out the output stream to write the request entity.
* @throws java.io.IOException
*/
void writeRequestEntity(OutputStream out) throws IOException;
}
/**
*
*/
private final class RequestEntityWriterImpl implements RequestEntityWriter {
private final ClientRequest cr;
private final Object entity;
private final Type entityType;
private MediaType mediaType;
private final long size;
private final MessageBodyWriter bw;
/**
*
* @param cr
*/
public RequestEntityWriterImpl(ClientRequest cr) {
this.cr = cr;
final Object e = cr.getEntity();
if (e == null)
throw new IllegalArgumentException("The entity of the client request is null");
if (e instanceof GenericEntity) {
final GenericEntity ge = (GenericEntity)e;
this.entity = ge.getEntity();
this.entityType = ge.getType();
} else {
this.entity = e;
this.entityType = entity.getClass();
}
final Class entityClass = entity.getClass();
MultivaluedMap metadata = cr.getMetadata();
final Object mediaTypeHeader = metadata.getFirst("Content-Type");
if (mediaTypeHeader instanceof MediaType) {
this.mediaType = (MediaType)mediaTypeHeader;
} else {
if (mediaTypeHeader != null) {
this.mediaType = MediaType.valueOf(mediaTypeHeader.toString());
} else {
// Content-Type is not present choose a default type
List mediaTypes = workers.getMessageBodyWriterMediaTypes(
entityClass, entityType, EMPTY_ANNOTATIONS);
this.mediaType = mediaTypes.get(0);
if (this.mediaType.isWildcardType() || this.mediaType.isWildcardSubtype())
this.mediaType = MediaType.APPLICATION_OCTET_STREAM_TYPE;
metadata.putSingle("Content-Type", this.mediaType);
}
}
this.bw = workers.getMessageBodyWriter(
entityClass, entityType,
EMPTY_ANNOTATIONS, mediaType);
if (bw == null) {
throw new ClientHandlerException(
"A message body writer for Java type, " + entity.getClass() +
", and MIME media type, " + mediaType + ", was not found");
}
this.size = bw.getSize(
entity, entityClass, entityType,
EMPTY_ANNOTATIONS, mediaType);
}
/**
*
* @return
*/
public long getSize() {
return size;
}
/**
*
* @return
*/
public MediaType getMediaType() {
return mediaType;
}
/**
*
* @param out
* @throws java.io.IOException
*/
public void writeRequestEntity(OutputStream out) throws IOException {
out = cr.getAdapter().adapt(cr, out);
bw.writeTo(entity, entity.getClass(), entityType,
EMPTY_ANNOTATIONS, mediaType, cr.getMetadata(),
out);
out.flush();
out.close();
}
}
@Context private MessageBodyWorkers workers;
protected MessageBodyWorkers getMessageBodyWorkers() {
return workers;
}
/**
* Convert a header value to a String instance.
*
* This method defers to {@link ClientRequest#getHeaderValue(java.lang.Object) }.
*
* @param headerValue the header value.
* @return the string instance.
*/
protected String headerValueToString(Object headerValue) {
return ClientRequest.getHeaderValue(headerValue);
}
/**
* Get a request entity writer capable of writing the request entity.
*
* @param ro the client request.
* @return the request entity writer.
*/
protected RequestEntityWriter getRequestEntityWriter(ClientRequest ro) {
return new RequestEntityWriterImpl(ro);
}
/**
* Write a request entity using an appropriate message body writer.
*
* The method {@link WriteRequestEntityListener#onRequestEntitySize(long) } will be invoked
* with the size of the request entity to be serialized.
* The method {@link WriteRequestEntityListener#onGetOutputStream() } will be invoked
* when the output stream is required to write the request entity.
*
* @param ro the client request containing the request entity. If the
* request entity is null then the method will not write any entity.
* @param listener the request entity listener.
* @throws java.io.IOException
*/
protected void writeRequestEntity(ClientRequest ro,
RequestEntityWriterListener listener) throws IOException {
Object entity = ro.getEntity();
if (entity == null)
return;
Type entityType = null;
if (entity instanceof GenericEntity) {
final GenericEntity ge = (GenericEntity)entity;
entityType = ge.getType();
entity = ge.getEntity();
} else {
entityType = entity.getClass();
}
final Class entityClass = entity.getClass();
MultivaluedMap metadata = ro.getMetadata();
MediaType mediaType = null;
final Object mediaTypeHeader = metadata.getFirst("Content-Type");
if (mediaTypeHeader instanceof MediaType) {
mediaType = (MediaType)mediaTypeHeader;
} else {
if (mediaTypeHeader != null) {
mediaType = MediaType.valueOf(mediaTypeHeader.toString());
} else {
// Content-Type is not present choose a default type
List mediaTypes = workers.getMessageBodyWriterMediaTypes(
entityClass, entityType, EMPTY_ANNOTATIONS);
mediaType = mediaTypes.get(0);
if (mediaType.isWildcardType() || mediaType.isWildcardSubtype())
mediaType = MediaType.APPLICATION_OCTET_STREAM_TYPE;
metadata.putSingle("Content-Type", mediaType);
}
}
final MessageBodyWriter bw = workers.getMessageBodyWriter(
entityClass, entityType,
EMPTY_ANNOTATIONS, mediaType);
if (bw == null) {
throw new ClientHandlerException(
"A message body writer for Java type, " + entity.getClass() +
", and MIME media type, " + mediaType + ", was not found");
}
final long size = bw.getSize(
entity, entityClass, entityType,
EMPTY_ANNOTATIONS, mediaType);
listener.onRequestEntitySize(size);
final OutputStream out = ro.getAdapter().adapt(ro, listener.onGetOutputStream());
bw.writeTo(entity, entityClass, entityType,
EMPTY_ANNOTATIONS, mediaType, metadata, out);
out.flush();
out.close();
}
}