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package org.glassfish.jersey.server.spi;
import java.io.OutputStream;
import java.util.concurrent.TimeUnit;
import org.glassfish.jersey.server.ApplicationHandler;
import org.glassfish.jersey.server.ContainerException;
import org.glassfish.jersey.server.ContainerResponse;
/**
* A suspendable, request-scoped I/O container response writer.
*
* I/O container sends a new instance of the response writer with every request as part
* of the call to the Jersey application
* {@link ApplicationHandler#apply(org.glassfish.jersey.server.ContainerRequest)} apply(...)}
* method. Each container response writer represents an open connection to the client
* (waiting for a response).
*
* For each request the Jersey runtime will make sure to directly call either
* {@link #suspend(long, TimeUnit, TimeoutHandler) suspend(...)}
* or {@code commit()} method on a response writer supplied to the
* {@code JerseyApplication.apply(...)} method before the method has finished. Therefore
* the I/O container implementations may assume that when the {@code JerseyApplication.apply(...)}
* method is finished, the container response writer is either {@link #commit() commited},
* or {@link #suspend(long, TimeUnit, TimeoutHandler) suspended}.
*
*
* @author Marek Potociar
*/
public interface ContainerResponseWriter {
/**
* Time-out handler can be registered when the container response writer gets
* suspended.
*
* Should the suspend operation time out, the container is responsible for
* invoking the {@link TimeoutHandler#onTimeout(ContainerResponseWriter)}
* callback method to get the response that should be returned to the client.
*/
public interface TimeoutHandler {
/**
* Method is called, when {@link ContainerResponseWriter#suspend(long, TimeUnit,
* ContainerResponseWriter.TimeoutHandler) ContainerResponseWriter.suspend(...)}
* operation times out.
*
* The custom time-out handler implementation is responsible for making
* sure a (time-out) response is written to the context and that the
* container context is properly closed.
*
* @param responseWriter suspended container response writer that timed out.
*/
public void onTimeout(ContainerResponseWriter responseWriter);
}
/**
* Write the status and headers of the response and return an output stream
* for the web application to write the entity of the response.
*
* If the response content length is declared to be greater or equal to 0, it
* means that the content length in bytes of the entity to be written is known,
* otherwise -1. I/O containers may use this value to determine whether the
* {@code "Content-Length"} header can be set or utilize chunked transfer encoding.
*
*
* @param contentLength greater or equal to 0 if the content length in bytes
* of the entity to be written is known, otherwise -1. Containers
* may use this value to determine whether the {@code "Content-Length"}
* header can be set or utilize chunked transfer encoding.
* @param responseContext the JAX-RS response to be written. The status and headers
* are obtained from the response.
* @return the output stream to write the entity (if any).
* @throws ContainerException if an error occurred when writing out the
* status and headers or obtaining the output stream.
*/
public OutputStream writeResponseStatusAndHeaders(long contentLength, ContainerResponse responseContext)
throws ContainerException;
/**
* Suspend the request/response processing.
*
* The method returns {@code true} to indicate the response writer was suspended successfully.
* In case the provider has already been suspended earlier, the method returns {@code false}.
*
* I/O container must not automatically {@link #commit() commit} the response writer
* when the processing on the I/O container thread is finished and the thread is
* released. Instead, the Jersey runtime will make sure to manually close
* the container response writer instance by explicitly calling the {@link #commit()}
* or {@link #failure(Throwable)} method at some later point in time.
*
*
* Once suspended, the specified suspend timeout can be further updated using
* {@link #setSuspendTimeout(long, java.util.concurrent.TimeUnit) } method.
*
*
* @param timeOut time-out value. Value less or equal to 0, indicates that
* the processing is suspended indefinitely.
* @param timeUnit time-out time unit.
* @param timeoutHandler time-out handler to process a time-out event if it
* occurs.
* @return {@code true} if the suspend operation completed successfully, {@code false} otherwise.
*
* @see #setSuspendTimeout(long, TimeUnit)
* @see #commit()
*/
public boolean suspend(long timeOut, TimeUnit timeUnit, TimeoutHandler timeoutHandler);
/**
* Set the suspend timeout.
*
* Once the container response writer is suspended, the suspend timeout value
* can be further updated by the method.
*
* @param timeOut time-out value. Value less or equal to 0, indicates that
* the processing is suspended indefinitely.
* @param timeUnit time-out time unit.
* @throws IllegalStateException in case the response writer has not been suspended
* yet.
*/
public void setSuspendTimeout(long timeOut, TimeUnit timeUnit) throws IllegalStateException;
/**
* Commit the response & close the container response writer.
*
* Indicates to the I/O container that request has been fully processed and response
* has been fully written. This signals the I/O container to finish the request/response
* processing, clean up any state, flush any streams, release resources etc.
*
* @see #suspend(long, TimeUnit, TimeoutHandler)
* @see #failure(Throwable)
*/
public void commit();
/**
* Propagate an unhandled error to the I/O container.
*
* Indicates to the I/O container that the request processing has finished with an error
* that could not be processed by the Jersey runtime. The I/O container is expected to process
* the exception in a container-specific way. This method also signals the I/O container to
* finish the request/response processing, clean up any state, flush any streams, release
* resources etc.
*
* @param error unhandled request processing error.
*
* @see #suspend(long, TimeUnit, TimeoutHandler)
* @see #commit()
*/
public void failure(Throwable error);
/**
* Return {@code true} if the entity buffering should be enabled in Jersey.
*
* If enabled, the outbound entity is buffered by Jersey runtime up to a configured amount of bytes
* prior to being written to the output stream to determine its size that may be used to set the value
* of HTTP {@value javax.ws.rs.core.HttpHeaders#CONTENT_LENGTH} header.
*
* Containers that provide it's own solution for determining the message payload size may decide to
* return {@code false} to prevent Jersey from buffering message entities unnecessarily.
*
*
* @return {@code true} to enable entity buffering to be done by Jersey runtime, {@code false} otherwise.
*/
public boolean enableResponseBuffering();
}