Java NbTestCase.assertGC方法代码示例

import org.netbeans.junit.NbTestCase; //导入方法依赖的package包/类
public void testAllSessionsClosed() {        
    //open source
    Node beanNode = new Node(new SourcePackagesNode(Utilities.testProjectName), "examples.advanced|MemoryView.java"); //NOI18N
    new OpenAction().perform(beanNode); // NOI18N
    EditorOperator eo = new EditorOperator("MemoryView.java");
    try {
        eo.clickMouse(50,50,1);
    } catch (Throwable t) {
        System.err.println(t.getMessage());
    }
    new EventTool().waitNoEvent(1000);
    //place breakpoint
    Utilities.toggleBreakpoint(eo, 104);
    //start debugging
    new DebugJavaFileAction().perform(beanNode);
    //wait for breakpoint
    Utilities.waitStatusText("Thread main stopped at MemoryView.java:104");
    List<? extends JPDADebugger> list = DebuggerManager
            .getDebuggerManager()
            .getCurrentSession()
            .lookup(null, JPDADebugger.class);
    JPDADebugger debugger = list.get(0);
    WeakReference<? extends JPDADebugger> debuggerRef = new WeakReference(debugger);

    //finish debugging
    Utilities.endAllSessions();
    //close sources
    eo.close();
    //nulling all temporary variables which could hold some references to debugger
    list = null;
    debugger = null;
    System.gc();
    try {
        NbTestCase.assertGC("All the debugging sessions were not correctly closed", debuggerRef);
    } catch (OutOfMemoryError u) {
        System.out.println(u.getMessage());
    }
}
 

import org.netbeans.junit.NbTestCase; //导入方法依赖的package包/类
/**
 * Asserts that the object can be garbage collected.
 * It suspends event queue thread to assure that OutOfMemoryError is not
 * thrown in it instead of the current thread.
 * @param text the text to show when test fails.
 * @param ref the referent to object that should be GCed
 * @see NbTestCase#assertGC(java.lang.String, java.lang.ref.Reference)
 */
static void assertGC(String text, Reference<?> ref) {
    final Object LOCK = new Object();
    blockEQ(LOCK);
    try {
        NbTestCase.assertGC(text, ref);
    } finally {
        // Resume EQ:
        synchronized (LOCK) {
            LOCK.notifyAll();
        }
    }
}
 

import org.netbeans.junit.NbTestCase; //导入方法依赖的package包/类
public static void assertGC(String msg, String... names) {
    AssertionFailedError t = null;

    List<Reference> refs = new ArrayList<Reference>();
    List<String> txts = new ArrayList<String>();
    int count = 0;
    Set<String> nameSet = names == null || names.length == 0 ? null : new HashSet<String>(Arrays.asList(names));
    synchronized (instances) {
        for (Iterator<Map.Entry<Object, String>> it = instances.entrySet().iterator(); it.hasNext();) {
            Entry<Object, String> entry = it.next();
            if (nameSet != null && !nameSet.contains(entry.getValue())) {
                continue;
            }

            refs.add(new WeakReference<Object>(entry.getKey()));
            txts.add(entry.getValue());
            it.remove();
            count++;
        }
    }

    if (count == 0) {
        Assert.fail("No instance of this type reported");
    }

    int cannotBeCollected = 0;
    for (int i = 0; i < count; i++) {
        Reference<?> r = refs.get(i);
        try {
            NbTestCase.assertGC(msg + " " + txts.get(i), r);
        } catch (AssertionFailedError ex) {
            cannotBeCollected++;
            if (t == null) {
                t = ex;
            } else {
                Throwable last = t;
                while (last.getCause() != null) {
                    last = last.getCause();
                }
                last.initCause(ex);
            }
        }
    }            
    if (t != null && cannotBeCollected > treshhold) {
        throw t;
    }
}