StreamingTest.java

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package org.glassfish.jersey.apache.connector;

import java.io.IOException;
import java.io.InputStream;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.Application;
import javax.ws.rs.core.MediaType;

import javax.inject.Singleton;

import org.glassfish.jersey.client.ClientConfig;
import org.glassfish.jersey.server.ChunkedOutput;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.test.JerseyTest;

import org.junit.Test;
import static org.junit.Assert.assertEquals;

/**
 * @author Petr Janouch (petr.janouch at oracle.com)
 */
public class StreamingTest extends JerseyTest {

    /**
     * Test that a data stream can be terminated from the client side.
     */
    @Test
    public void clientCloseTest() throws IOException {
        // start streaming
        InputStream inputStream = target().path("/streamingEndpoint").request().get(InputStream.class);

        WebTarget sendTarget = target().path("/streamingEndpoint/send");
        // trigger sending 'A' to the stream; OK is sent if everything on the server was OK
        assertEquals("OK", sendTarget.request().get().readEntity(String.class));
        // check 'A' has been sent
        assertEquals('A', inputStream.read());
        // closing the stream should tear down the connection
        inputStream.close();
        // trigger sending another 'A' to the stream; it should fail
        // (indicating that the streaming has been terminated on the server)
        assertEquals("NOK", sendTarget.request().get().readEntity(String.class));
    }

    @Override
    protected void configureClient(ClientConfig config) {
        config.connectorProvider(new ApacheConnectorProvider());
    }

    @Override
    protected Application configure() {
        return new ResourceConfig(StreamingEndpoint.class);
    }

    @Singleton
    @Path("streamingEndpoint")
    public static class StreamingEndpoint {

        private final ChunkedOutput<String> output = new ChunkedOutput<>(String.class);

        @GET
        @Path("send")
        public String sendEvent() {
            try {
                output.write("A");
            } catch (IOException e) {
                return "NOK";
            }

            return "OK";
        }

        @GET
        @Produces(MediaType.TEXT_PLAIN)
        public ChunkedOutput<String> get() {
            return output;
        }
    }
}