Attachment #32196 for bug #57173

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package org.apache.tomcat.util.bcel;

import java.io.File;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashSet;
import java.util.Locale;
import java.util.Random;
import java.util.Set;

import org.junit.Test;


    private static final String JAR_LOCATION = "/tmp/jira-libs";

    /**
     * An InputStream that returns less bytes than a read(byte[]) call asks for.
     */
    private static class SlowInputStream extends FilterInputStream {

        private final Random r = new Random();

        public SlowInputStream(InputStream in) {
            super(in);
        }

        @Override
        public int read(byte[] b, int off, int len) throws IOException {
            if (len <= 0) {
                if (len == 0) {
                    return 0;
                }
                throw new IndexOutOfBoundsException();
            }
            int randomLength = 1 + r.nextInt(len);
            return super.read(b, off, randomLength);
        }

        @Override
        public int available() throws IOException {
            int result = super.available(); 
            return result > 0 ? 1 : result;
        }
    }

    @Test
    public void testClassParserPerformance() throws IOException {
        File libDir = new File(JAR_LOCATION);

            while (jarEntryName != null) {
                if (jarEntryName.endsWith(".class")) {
                    InputStream is = jar.getEntryInputStream();
                    is = new SlowInputStream(is);
                    long start = System.nanoTime();
                    ClassParser cp = new ClassParser(is);
                    cp.parse();

Return to bug 57173

Lines 17-27 Link Here

(-)test/org/apache/tomcat/util/bcel/TesterPerformance.java (+33 lines)
17	package org.apache.tomcat.util.bcel;	17	package org.apache.tomcat.util.bcel;
18		18
19	import java.io.File;	19	import java.io.File;
		20	import java.io.FilterInputStream;
20	import java.io.IOException;	21	import java.io.IOException;
21	import java.io.InputStream;	22	import java.io.InputStream;
22	import java.net.URL;	23	import java.net.URL;
23	import java.util.HashSet;	24	import java.util.HashSet;
24	import java.util.Locale;	25	import java.util.Locale;
		26	import java.util.Random;
25	import java.util.Set;	27	import java.util.Set;
26		28
27	import org.junit.Test;	29	import org.junit.Test;
Lines 34-39 Link Here
34		36
35	private static final String JAR_LOCATION = "/tmp/jira-libs";	37	private static final String JAR_LOCATION = "/tmp/jira-libs";
36		38
		39	/**
		40	* An InputStream that returns less bytes than a read(byte[]) call asks for.
		41	*/
		42	private static class SlowInputStream extends FilterInputStream {
		43
		44	private final Random r = new Random();
		45
		46	public SlowInputStream(InputStream in) {
		47	super(in);
		48	}
		49
		50	@Override
		51	public int read(byte[] b, int off, int len) throws IOException {
		52	if (len <= 0) {
		53	if (len == 0) {
		54	return 0;
		55	}
		56	throw new IndexOutOfBoundsException();
		57	}
		58	int randomLength = 1 + r.nextInt(len);
		59	return super.read(b, off, randomLength);
		60	}
		61
		62	@Override
		63	public int available() throws IOException {
		64	int result = super.available();
		65	return result > 0 ? 1 : result;
		66	}
		67	}
		68
37	@Test	69	@Test
38	public void testClassParserPerformance() throws IOException {	70	public void testClassParserPerformance() throws IOException {
39	File libDir = new File(JAR_LOCATION);	71	File libDir = new File(JAR_LOCATION);
Lines 57-62 Link Here
57	while (jarEntryName != null) {	89	while (jarEntryName != null) {
58	if (jarEntryName.endsWith(".class")) {	90	if (jarEntryName.endsWith(".class")) {
59	InputStream is = jar.getEntryInputStream();	91	InputStream is = jar.getEntryInputStream();
		92	is = new SlowInputStream(is);
60	long start = System.nanoTime();	93	long start = System.nanoTime();
61	ClassParser cp = new ClassParser(is);	94	ClassParser cp = new ClassParser(is);
62	cp.parse();	95	cp.parse();