Examples of ConcurrencyManager

oracle.toplink.essentials.internal.helper.ConcurrencyManager
INTERNAL:
Purpose: To maintain concurrency for a paticular task. It is a wrappers of a semaphore that allows recursive waits by a single thread.
Responsibilities:
- Keep track of the active thread.
- Wait all other threads until the first thread is done.
- Maintain the depth of the active thread.
org.eclipse.persistence.internal.helper.ConcurrencyManager
INTERNAL:
Purpose: To maintain concurrency for a particular task. It is a wrappers of a semaphore that allows recursive waits by a single thread.
Responsibilities:
- Keep track of the active thread.
- Wait all other threads until the first thread is done.
- Maintain the depth of the active thread.
org.rhq.enterprise.communications.util.ConcurrencyManager
This is basically a thread gatekeeper that allows a thread to ask for permission to continue.
Under the covers, this object uses a set of named counting semaphores. A calling thread asks for permission by giving a name to {@link #getPermit(String)}; if no more permits are available on the named semaphore, this manager will throw a runtime exception. In effect, it will abort a thread unless that thread is permitted to continue. Because this manager maintains a dynamic set of named counting semaphores, you can have groups of threads that are allowed to operate independently of other groups of threads (i.e. each group of threads can use their own named semaphore).
Each counting semaphore will be given a default number of total permits. You can set a custom number of permits per counting semaphore by passing in a set of names with their associated number-of-permits-allowed to the constructor.
@author John Mazzitelli

Examples of oracle.toplink.essentials.internal.helper.ConcurrencyManager

    protected Hashtable getLocks() {
        return locks;
    }


    protected void acquireLock(String seqName) {
        ConcurrencyManager manager;
        synchronized (getLocks()) {
            manager = (ConcurrencyManager)getLocks().get(seqName);
            if (manager == null) {
                manager = new ConcurrencyManager();
                getLocks().put(seqName, manager);
            }
        }
        manager.acquire();
    }

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Examples of oracle.toplink.essentials.internal.helper.ConcurrencyManager

        }
        manager.acquire();
    }


    protected void releaseLock(String seqName) {
        ConcurrencyManager manager = (ConcurrencyManager)locks.get(seqName);
        manager.release();
    }

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Examples of oracle.toplink.essentials.internal.helper.ConcurrencyManager

     * The transaction mutex ensure mutual exclusion on transaction across multiple threads.
     */
    public synchronized ConcurrencyManager getTransactionMutex() {
        // PERF: not always required, defer.
        if (transactionMutex == null) {
            transactionMutex = new ConcurrencyManager();
        }
        return transactionMutex;
    }

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Examples of org.eclipse.persistence.internal.helper.ConcurrencyManager

    /**
     * Acquire a lock for the sequence name.
     * A lock should be, and only be, acquired when allocating new sequences from the database.
     */
    protected void acquireLock(String sequenceName) {
        ConcurrencyManager manager = getLocks().get(sequenceName);
        if (manager == null) {
            synchronized (getLocks()) {
                manager = getLocks().get(sequenceName);
                if (manager == null) {
                    manager = new ConcurrencyManager();
                    getLocks().put(sequenceName, manager);
                }
            }
        }
        manager.acquire();
    }

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Examples of org.eclipse.persistence.internal.helper.ConcurrencyManager

    
    /**
     * Release a lock for the sequence name.
     */
    protected void releaseLock(String seqName) {
        ConcurrencyManager manager = getLocks().get(seqName);
        manager.release();
    }

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Examples of org.eclipse.persistence.internal.helper.ConcurrencyManager

    /**
     * Acquire a lock for the sequence name.
     * A lock should be, and only be, acquired when allocating new sequences from the database.
     */
    protected void acquireLock(String sequenceName) {
        ConcurrencyManager manager = getLocks().get(sequenceName);
        if (manager == null) {
            synchronized (getLocks()) {
                manager = getLocks().get(sequenceName);
                if (manager == null) {
                    manager = new ConcurrencyManager();
                    getLocks().put(sequenceName, manager);
                }
            }
        }
        manager.acquire();
    }

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Examples of org.eclipse.persistence.internal.helper.ConcurrencyManager

    
    /**
     * Release a lock for the sequence name.
     */
    protected void releaseLock(String seqName) {
        ConcurrencyManager manager = getLocks().get(seqName);
        manager.release();
    }

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Examples of org.eclipse.persistence.internal.helper.ConcurrencyManager

    /**
     * Acquire a lock for the sequence name.
     * A lock should be, and only be, acquired when allocating new sequences from the database.
     */
    protected void acquireLock(String sequenceName) {
        ConcurrencyManager manager = getLocks().get(sequenceName);
        if (manager == null) {
            synchronized (getLocks()) {
                manager = getLocks().get(sequenceName);
                if (manager == null) {
                    manager = new ConcurrencyManager();
                    getLocks().put(sequenceName, manager);
                }
            }
        }
        manager.acquire();
    }

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Examples of org.eclipse.persistence.internal.helper.ConcurrencyManager

    
    /**
     * Release a lock for the sequence name.
     */
    protected void releaseLock(String seqName) {
        ConcurrencyManager manager = getLocks().get(seqName);
        manager.release();
    }

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Examples of org.eclipse.persistence.internal.helper.ConcurrencyManager

    /**
     * Acquire a lock for the sequence name.
     * A lock should be, and only be, acquired when allocating new sequences from the database.
     */
    protected void acquireLock(String sequenceName) {
        ConcurrencyManager manager = getLocks().get(sequenceName);
        if (manager == null) {
            synchronized (getLocks()) {
                manager = getLocks().get(sequenceName);
                if (manager == null) {
                    manager = new ConcurrencyManager();
                    getLocks().put(sequenceName, manager);
                }
            }
        }
        manager.acquire();
    }

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