47 * @since 1.6
48 * @author Doug Lea
49 */
50 public abstract class AbstractOwnableSynchronizer
51 implements java.io.Serializable {
52
53 /** Use serial ID even though all fields transient. */
54 private static final long serialVersionUID = 3737899427754241961L;
55
56 /**
57 * Empty constructor for use by subclasses.
58 */
59 protected AbstractOwnableSynchronizer() { }
60
61 /**
62 * The current owner of exclusive mode synchronization.
63 */
64 private transient Thread exclusiveOwnerThread;
65
66 /**
67 * Sets the thread that currently owns exclusive access.
68 * A {@code null} argument indicates that no thread owns access.
69 * This method does not otherwise impose any synchronization or
70 * {@code volatile} field accesses.
71 * @param thread the owner thread
72 */
73 protected final void setExclusiveOwnerThread(Thread thread) {
74 exclusiveOwnerThread = thread;
75 }
76
77 /**
78 * Returns the thread last set by {@code setExclusiveOwnerThread},
79 * or {@code null} if never set. This method does not otherwise
80 * impose any synchronization or {@code volatile} field accesses.
81 * @return the owner thread
82 */
83 protected final Thread getExclusiveOwnerThread() {
84 return exclusiveOwnerThread;
85 }
86 }
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47 * @since 1.6
48 * @author Doug Lea
49 */
50 public abstract class AbstractOwnableSynchronizer
51 implements java.io.Serializable {
52
53 /** Use serial ID even though all fields transient. */
54 private static final long serialVersionUID = 3737899427754241961L;
55
56 /**
57 * Empty constructor for use by subclasses.
58 */
59 protected AbstractOwnableSynchronizer() { }
60
61 /**
62 * The current owner of exclusive mode synchronization.
63 */
64 private transient Thread exclusiveOwnerThread;
65
66 /**
67 * The current or last owner of exclusive mode synchronization.
68 */
69 private transient Thread lastExclusiveOwnerThread;
70
71 /**
72 * Sets the thread that currently owns exclusive access.
73 * A {@code null} argument indicates that no thread owns access.
74 * This method does not otherwise impose any synchronization or
75 * {@code volatile} field accesses.
76 * @param thread the owner thread
77 */
78 protected final void setExclusiveOwnerThread(Thread thread) {
79 if (thread != null) {
80 lastExclusiveOwnerThread = thread;
81 }
82 exclusiveOwnerThread = thread;
83 }
84
85 /**
86 * Returns the thread last set by {@code setExclusiveOwnerThread},
87 * or {@code null} if never set. This method does not otherwise
88 * impose any synchronization or {@code volatile} field accesses.
89 * @return the owner thread
90 */
91 protected final Thread getExclusiveOwnerThread() {
92 return exclusiveOwnerThread;
93 }
94 }
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