Examples of org.apache.openjpa.lib.util.concurrent.ConcurrentHashMap

Package org.apache.openjpa.lib.util.concurrent

Examples of org.apache.openjpa.lib.util.concurrent.ConcurrentHashMap

org.apache.openjpa.lib.util.concurrent.ConcurrentHashMap
This class implements a HashMap which has limited synchronization. In particular mutators are generally synchronized while accessors are generally not. Additionally the Iterators returned by this class are not "fail-fast", but instead try to continue to iterate over the data structure after changes have been made. The synchronization semantics are built right in to the implementation rather than using a delegating wrapper like the other collection classes do because it wasn't clear to me that the how the two should be seperated or that it would be useful to do so. This can probably be a topic for further debate in the future. This class is based heavily on the HashMap class in the Java collections package.

        // can't have a null reference in the map, so use symbolic 
        // constant as key
        Object key = loader == null ? NULL_LOADER : loader;
        Map loaderCache = (Map) _loaders.get(key);
        if (loaderCache == null) { // We don't have a cache for this loader.
            loaderCache = new ConcurrentHashMap();
            _loaders.put(key, loaderCache);
        } else {  // We have a cache for this loader.
            cls = (Class) loaderCache.get(clsName);
        }

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     */
    public CacheMap(boolean lru, int max, int size, float load) {
        if (size < 0)
            size = 500;
        if (!lru) {
            cacheMap = new ConcurrentHashMap(size, load) {
                public void overflowRemoved(Object key, Object value) {
                    cacheMapOverflowRemoved(key, value);
                }
            };
            softMap = new ConcurrentReferenceHashMap(ReferenceMap.HARD,
                ReferenceMap.SOFT, size, load) {
                public void overflowRemoved(Object key, Object value) {
                    softMapOverflowRemoved(key, value);
                }


                public void valueExpired(Object key) {
                    softMapValueExpired(key);
                }
            };
            pinnedMap = new ConcurrentHashMap();
            _readLock = null;
        } else {
            cacheMap = new LRUMap(size, load) {
                public void overflowRemoved(Object key, Object value) {
                    cacheMapOverflowRemoved(key, value);

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        AbstractBrokerFactory factory = getPooledFactory(_conf);
        if (factory != null)
            return factory;


        // reset these transient fields to empty values
        _transactional = new ConcurrentHashMap();
        _brokers = new ConcurrentReferenceHashSet(
                ConcurrentReferenceHashSet.WEAK);


        makeReadOnly();
        return this;

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            public void valueExpired(Object key) {
                softMapValueExpired(key);
            }
        };
        pinnedMap = new ConcurrentHashMap();


        if (!lru) {
            cacheMap = new ConcurrentHashMap(size, load) {
                public void overflowRemoved(Object key, Object value) {
                    cacheMapOverflowRemoved(key, value);
                }
            };
            _readLock = null;

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            public void valueExpired(Object key) {
                softMapValueExpired(key);
            }
        };
        pinnedMap = new ConcurrentHashMap();


        if (!lru) {
            cacheMap = new ConcurrentHashMap(size, load) {
                public void overflowRemoved(Object key, Object value) {
                    cacheMapOverflowRemoved(key, value);
                }
            };
            _readLock = null;

View Full Code Here


            public void valueExpired(Object key) {
                softMapValueExpired(key);
            }
        };
        pinnedMap = new ConcurrentHashMap();


        if (!lru) {
            cacheMap = new ConcurrentHashMap(size, load) {
                public void overflowRemoved(Object key, Object value) {
                    cacheMapOverflowRemoved(key, value);
                }
            };
            _readLock = null;

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        AbstractBrokerFactory factory = getPooledFactory(_conf);
        if (factory != null)
            return factory;


        // reset these transient fields to empty values
        _transactional = new ConcurrentHashMap();
        _brokers = new ConcurrentReferenceHashSet(
                ConcurrentReferenceHashSet.WEAK);


        makeReadOnly();
        return this;

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        AbstractBrokerFactory factory = getPooledFactory(_conf);
        if (factory != null)
            return factory;


        // reset these transient fields to empty values
        _transactional = new ConcurrentHashMap();
        _brokers = new ConcurrentReferenceHashSet(
                ConcurrentReferenceHashSet.WEAK);


        makeReadOnly();
        return this;

View Full Code Here

            // can't have a null reference in the map, so use symbolic
            // constant as key
            Object key = loader == null ? NULL_LOADER : loader;
            Map loaderCache = (Map) _loaders.get(key);
            if (loaderCache == null) { // We don't have a cache for this loader.
                loaderCache = new ConcurrentHashMap();
                _loaders.put(key, loaderCache);
            } else {  // We have a cache for this loader.
                cls = (Class) loaderCache.get(clsName);
            }

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Related Classes of org.apache.openjpa.lib.util.concurrent.ConcurrentHashMap

org.apache.openjpa.kernel.AbstractBrokerFactory

org.apache.openjpa.lib.conf.Configurations

org.apache.openjpa.util.CacheMap

java.util.NoSuchElementException

java.util.Collection

java.util.Set

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