Examples of IEntityLockService

org.jasig.portal.concurrency.IEntityLockService
Defines an api for acquiring lock objects, IEntityLocks, that can be used to control concurrent access to portal entities. A lock is associated with a particular entity and has an owner, a lockType and a service-controlled expirationTime. Currently supported lock types are READ_LOCK and WRITE_LOCK.
If I want to lock an entity for update, I ask the service for a write lock:
int lockType = IEntityLockService.WRITE_LOCK; EntityIdentifier eid = myEntity.getEntityIdentifier(); IEntityLock lock = svc.newLock(eid, lockType, lockOwner);
If there is no conflicting lock on the entity, the service responds with the requested lock. If I acquire the lock, I know that no other client will get be able to get a conflicting lock. From then on, I communicate with the service via the lock:
lock.convert(int newType); lock.isValid(); lock.release(); lock.renew();
A READ lock guarantees repeatable reads; other clients can get READ locks but not WRITE locks. A WRITE lock guarantees exclusive access; no other clients can get either READ or WRITE locks on the entity.
NB: since the locking service is not part of a transactional or object persistence framework, it has no way to enforce its own use. @author Dan Ellentuck @version $Revision: 19776 $

Examples of org.jasig.portal.concurrency.IEntityLockService

public void testServiceConvert() throws Exception
{


    String msg = null;
    boolean valid = false;
    IEntityLockService service = getService();
    int readSecs = 30;
    int writeSecs = 45;


    // Create a READ lock on Group testKeys[3], owned by testIds[0]:
    print("Creating new READ lock");
    IEntityLock lock = service.newLock(GROUP_CLASS, testKeys[3], IEntityLockService.READ_LOCK, testIds[0], readSecs);
    msg = "Testing if new lock is valid";
    valid = service.isValid(lock);
    print(msg);
    assertTrue(msg, valid);


    // Convert the READ lock to a WRITE lock:
    print("Converting READ lock to WRITE");
    service.convert(lock, IEntityLockService.WRITE_LOCK, writeSecs);
    msg = "Testing if converted lock is still valid";
    valid = service.isValid(lock);
    print(msg);
    assertTrue(msg, valid);


    // Convert the WRITE lock back to a READ lock:
    print("Converting WRITE lock to READ");
    service.convert(lock, IEntityLockService.READ_LOCK, readSecs);
    msg = "Testing if converted lock is still valid";
    valid = service.isValid(lock);
    print(msg);
    assertTrue(msg, valid);


    // Now try to create a WRITE lock on the same entity for a different owner.
    IEntityLock duplicateLock = null;
    msg = "Attempting to create a duplicate lock; should be null";
    print(msg);


    try { duplicateLock = service.newLock(GROUP_CLASS, testKeys[3], IEntityLockService.WRITE_LOCK, testIds[1]); }
    catch (LockingException le) {print("Caught exception: " + le.getMessage()); }


    assertNull(msg, duplicateLock);


}

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Examples of org.jasig.portal.concurrency.IEntityLockService

 */
public void testServiceLockRenewal() throws Exception
{
    String msg = null;
    boolean valid = false;
    IEntityLockService service = getService();


    msg = "Attempting to renew an old lock";
    print(msg);
    IEntityLock badLock = testLocks[2];
    msg = "Checking if lock was renewed.";
    print(msg);
    try { service.renew(badLock); } catch (Exception ex) {print("Caught Exception: " + ex.getMessage()); }
    assertTrue(msg, ! service.isValid(badLock));


    msg = "Attempting to renew a valid lock";
    print(msg);
    IEntityLock goodLock = testLocks[0];
    msg = "Checking if lock was renewed.";
    print(msg);
    try { service.renew(goodLock); } catch (Exception ex) {print("Caught Exception: " + ex.getMessage()); }
    assertTrue(msg, service.isValid(goodLock));


}

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Examples of org.jasig.portal.concurrency.IEntityLockService


    String msg = null;
    boolean valid = false;


    print("Creating new lock");
    IEntityLockService service = getService();
    IEntityLock newLock = service.newLock(GROUP_CLASS, testKeys[3], IEntityLockService.WRITE_LOCK, testIds[0]);
    msg = "Testing if new lock is valid";
    valid = getService().existsInStore(newLock);
    print(msg);
    assertTrue(msg, valid);

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Examples of org.jasig.portal.concurrency.IEntityLockService

public void testServiceConvert() throws Exception
{


    String msg = null;
    boolean valid = false;
    IEntityLockService service = getService();
    int readSecs = 30;
    int writeSecs = 45;


    // Create a READ lock on Group testKeys[3], owned by testIds[0]:
    print("Creating new READ lock");
    IEntityLock lock = service.newLock(GROUP_CLASS, testKeys[3], IEntityLockService.READ_LOCK, testIds[0], readSecs);
    msg = "Testing if new lock is valid";
    valid = service.isValid(lock);
    print(msg);
    assertTrue(msg, valid);


    // Convert the READ lock to a WRITE lock:
    print("Converting READ lock to WRITE");
    service.convert(lock, IEntityLockService.WRITE_LOCK, writeSecs);
    msg = "Testing if converted lock is still valid";
    valid = service.isValid(lock);
    print(msg);
    assertTrue(msg, valid);


    // Convert the WRITE lock back to a READ lock:
    print("Converting WRITE lock to READ");
    service.convert(lock, IEntityLockService.READ_LOCK, readSecs);
    msg = "Testing if converted lock is still valid";
    valid = service.isValid(lock);
    print(msg);
    assertTrue(msg, valid);


    // Now try to create a WRITE lock on the same entity for a different owner.
    IEntityLock duplicateLock = null;
    msg = "Attempting to create a duplicate lock; should be null";
    print(msg);


    try { duplicateLock = service.newLock(GROUP_CLASS, testKeys[3], IEntityLockService.WRITE_LOCK, testIds[1]); }
    catch (LockingException le) {print("Caught exception: " + le.getMessage()); }


    assertNull(msg, duplicateLock);


}

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Examples of org.jasig.portal.concurrency.IEntityLockService

 */
public void testServiceLockRenewal() throws Exception
{
    String msg = null;
    boolean valid = false;
    IEntityLockService service = getService();


    msg = "Attempting to renew an old lock";
    print(msg);
    IEntityLock badLock = testLocks[2];
    msg = "Checking if lock was renewed.";
    print(msg);
    try { service.renew(badLock); } catch (Exception ex) {print("Caught Exception: " + ex.getMessage()); }
    assertTrue(msg, ! service.isValid(badLock));


    msg = "Attempting to renew a valid lock";
    print(msg);
    IEntityLock goodLock = testLocks[0];
    msg = "Checking if lock was renewed.";
    print(msg);
    try { service.renew(goodLock); } catch (Exception ex) {print("Caught Exception: " + ex.getMessage()); }
    assertTrue(msg, service.isValid(goodLock));


}

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Examples of org.jasig.portal.concurrency.IEntityLockService


    String msg = null;
    boolean valid = false;


    print("Creating new lock");
    IEntityLockService service = getService();
    IEntityLock newLock = service.newLock(GROUP_CLASS, testKeys[3], IEntityLockService.WRITE_LOCK, testIds[0]);
    msg = "Testing if new lock is valid";
    valid = getService().existsInStore(newLock);
    print(msg);
    assertTrue(msg, valid);

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