1 /* 2 * Copyright (c) 2018 Mockito contributors 3 * This program is made available under the terms of the MIT License. 4 */ 5 6 package org.mockito.internal.invocation.mockref; 7 8 import java.io.ObjectStreamException; 9 import java.lang.ref.WeakReference; 10 11 /** 12 * A weak reference that is converted into a strong reference when serialized. 13 * See {@link MockReference}. 14 */ 15 public class MockWeakReference<T> implements MockReference<T> { 16 17 private final WeakReference<T> ref; 18 19 public MockWeakReference(T t) { 20 this.ref = new WeakReference<T>(t); 21 } 22 23 private Object writeReplace() throws ObjectStreamException { 24 return new MockStrongReference<T>(get(), true); 25 } 26 27 @Override 28 public T get() { 29 T ref = this.ref.get(); 30 31 if (ref == null) { 32 throw new IllegalStateException("The mock object was garbage collected. " + 33 "This should not happen in normal circumstances when using public API. " + 34 "Typically, the test class keeps strong reference to the mock object " + 35 "and it prevents getting the mock collected. Mockito internally needs " + 36 "to keep weak references to mock objects to avoid memory leaks for " + 37 "certain types of MockMaker implementations. If you see this exception " + 38 "using Mockito public API, please file a bug. For more information see " + 39 "issue #1313."); 40 } 41 42 return ref; 43 } 44 } 45
