jdk/test/jdk/java/net/httpclient/BufferSizePropertyClampTest.java

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import jdk.internal.net.http.common.Utils;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;

import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.logging.Handler;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

import static org.junit.jupiter.api.Assertions.assertEquals;

/*
 * @test
 * @bug 8367976
 * @summary Verifies that the `jdk.httpclient.bufsize` system property is
 *          clamped correctly
 *
 * @library /test/lib
 *
 * @comment `-Djdk.httpclient.HttpClient.log=errors` is needed to enable
 *          logging and verify that invalid input gets logged
 * @run junit/othervm
 *      -Djdk.httpclient.HttpClient.log=errors
 *      -Djdk.httpclient.bufsize=-1
 *      BufferSizePropertyClampTest
 * @run junit/othervm
 *      -Djdk.httpclient.HttpClient.log=errors
 *      -Djdk.httpclient.bufsize=0
 *      BufferSizePropertyClampTest
 * @run junit/othervm
 *      -Djdk.httpclient.HttpClient.log=errors
 *      -Djdk.httpclient.bufsize=16385
 *      BufferSizePropertyClampTest
 */

class BufferSizePropertyClampTest {

    /** Anchor to avoid the {@code Logger} instance get GC'ed */
    private static final Logger CLIENT_LOGGER =
            Logger.getLogger("jdk.httpclient.HttpClient");

    private static final List<String> CLIENT_LOGGER_MESSAGES =
            Collections.synchronizedList(new ArrayList<>());

    private static final String EXPECTED_MSG =
            "ERROR: Property value for jdk.httpclient.bufsize={0} not in [1..16,384]: using default=16,384";

    private static String format(String pattern, Object... args) {
        return new MessageFormat(pattern, Locale.ROOT).format(args);
    }

    @BeforeAll
    static void registerLoggerHandler() {
        CLIENT_LOGGER.addHandler(new Handler() {

            @Override
            public void publish(LogRecord record) {
                var message = format(record.getMessage(), record.getParameters());
                CLIENT_LOGGER_MESSAGES.add(message);
            }

            @Override
            public void flush() {
                // Do nothing
            }

            @Override
            public void close() {
                // Do nothing
            }

        });
    }

    @Test
    void test() {
        assertEquals(16384, Utils.BUFSIZE);
        assertEquals(
                1, CLIENT_LOGGER_MESSAGES.size(),
                "Unexpected number of logger messages: " + CLIENT_LOGGER_MESSAGES);
        var expectedMessage = format(EXPECTED_MSG, Integer.getInteger("jdk.httpclient.bufsize"));
        assertEquals(expectedMessage, CLIENT_LOGGER_MESSAGES.getFirst());
    }

}