testcache.java

来自「一个不错的cache」· Java 代码 · 共 152 行

/*
 * Copyright (c) 2002-2003 by OpenSymphony
 * All rights reserved.
 */
package com.opensymphony.oscache.base;

import com.opensymphony.oscache.general.GeneralCacheAdministrator;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

/**
 * Test the public methods of the Cache class
 *
 * $Id: TestCache.java,v 1.2 2003/11/17 10:59:20 chris_miller Exp $
 * @version        $Revision: 1.2 $
 * @author <a href="mailto:[e-mail]">Alain Bergevin</a>
 */
public class TestCache extends TestCase {
    // Static variables required thru all the tests
    private static Cache map = null;
    private final String CONTENT = "Content for the cache test";

    // Constants needed thru all the tests
    private final String ENTRY_KEY = "Test cache key";
    private final int NO_REFRESH_NEEDED = CacheEntry.INDEFINITE_EXPIRY;
    private final int REFRESH_NEEDED = 0;

    /**
     * Class constructor.
     * <p>
     * @param str The test name (required by JUnit)
     */
    public TestCache(String str) {
        super(str);
    }

    /**
     * This method is invoked before each testXXXX methods of the
     * class. It set ups the variables required for each tests.
     */
    public void setUp() {
        // At first invocation, create a new Cache
        if (map == null) {
            GeneralCacheAdministrator admin = new GeneralCacheAdministrator();
            map = admin.getCache();
            assertNotNull(map);
        }
    }

    /**
     * This methods returns the name of this test class to JUnit
     * <p>
     * @return The name of this class
     */
    public static Test suite() {
        return new TestSuite(TestCache.class);
    }

    /**
     * Verify that items may still be flushed by key pattern
     */
    public void testFlushPattern() {
        // Try to flush with a bad pattern and ensure that our data is still there
        map.putInCache(ENTRY_KEY, CONTENT);
        map.flushPattern(ENTRY_KEY + "do not flush");
        getBackContent(map, CONTENT, NO_REFRESH_NEEDED, false);

        // Flush our map for real
        map.flushPattern(ENTRY_KEY.substring(1, 2));
        getBackContent(map, CONTENT, NO_REFRESH_NEEDED, true);

        // Check invalid values
        map.flushPattern("");
        map.flushPattern(null);
    }

    /**
     * Verify that we can put item in the cache and that they are correctly retrieved
     */
    public void testPutGetFromCache() {
        // We put content in the cache and get it back with and without refresh
        map.putInCache(ENTRY_KEY, CONTENT);
        getBackContent(map, CONTENT, NO_REFRESH_NEEDED, false);
        getBackContent(map, CONTENT, REFRESH_NEEDED, true);

        // Test with invalid values

        /** TODO Verify this logic */
        try {
            assertNull(map.getFromCache("", NO_REFRESH_NEEDED));
        } catch (NeedsRefreshException nre) {
            map.cancelUpdate("");
        } catch (Exception e) {
        }

        try {
            assertNull(map.getFromCache(null, NO_REFRESH_NEEDED));
        } catch (NeedsRefreshException nre) {
            map.cancelUpdate(null);
        } catch (Exception e) {
        }
    }

    /**
     * Verify that we can put item in the cache and that they are correctly retrieved
     */
    public void testPutGetFromCacheWithPolicy() {
        // We put content in the cache and get it back
        map.putInCache(ENTRY_KEY + "policy", CONTENT, new DummyAlwayRefreshEntryPolicy());

        // Should get a refresh
        try {
            map.getFromCache(ENTRY_KEY + "policy", -1);
            fail("Should have got a refresh.");
        } catch (NeedsRefreshException nre) {
            map.cancelUpdate(ENTRY_KEY + "policy");
        }
    }

    protected void tearDown() throws Exception {
        if (map != null) {
            map.clear();
        }
    }

    /**
     * Retrieve the content in the cache
     * <p>
     * @param map       The Cache in which the data is stored
     * @param content   The content expected to be retrieved
     * @param refresh   Time interval to determine if the cache object needs refresh
     * @param exceptionExpected Specify if a NeedsRefreshException is expected
     */
    private void getBackContent(Cache map, Object content, int refresh, boolean exceptionExpected) {
        try {
            assertEquals(content, map.getFromCache(ENTRY_KEY, refresh));

            if (exceptionExpected) {
                fail("NeedsRefreshException should have been thrown!");
            }
        } catch (NeedsRefreshException nre) {
            map.cancelUpdate(ENTRY_KEY);

            if (!exceptionExpected) {
                fail("NeedsRefreshException shouldn't have been thrown!");
            }
        }
    }
}