Example usage for org.apache.commons.lang3.concurrent ConcurrentUtils putIfAbsent

Introduction

In this page you can find the example usage for org.apache.commons.lang3.concurrent ConcurrentUtils putIfAbsent.

Prototype

public static <K, V> V putIfAbsent(final ConcurrentMap<K, V> map, final K key, final V value) 

Source Link

Document

Puts a value in the specified ConcurrentMap if the key is not yet present.

Usage

From source file:org.onlab.util.GroupedThreadFactory.java

/**
 * Returns thread factory for producing threads associated with the specified
 * group name. The group name-space is hierarchical, based on slash-delimited
 * name segments, e.g. {@code onos/intent}.
 *
 * @param groupName group name/*from w  w  w .j av a2 s . com*/
 * @return thread factory
 */
public static GroupedThreadFactory groupedThreadFactory(String groupName) {
    GroupedThreadFactory factory = FACTORIES.get(groupName);
    if (factory != null) {
        return factory;
    }

    // Find the parent group or root the group hierarchy under default group.
    int i = groupName.lastIndexOf(DELIMITER);
    if (i > 0) {
        String name = groupName.substring(0, i);
        ThreadGroup parentGroup = groupedThreadFactory(name).threadGroup();
        factory = new GroupedThreadFactory(new ThreadGroup(parentGroup, groupName));
    } else {
        factory = new GroupedThreadFactory(new ThreadGroup(groupName));
    }

    return ConcurrentUtils.putIfAbsent(FACTORIES, groupName, factory);
}

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From source file:org.onosproject.provider.nil.link.impl.NullLinkProvider.java

private boolean addLdesc(DeviceId did, LinkDescription ldesc) {
    Set<LinkDescription> ldescs = ConcurrentUtils.putIfAbsent(linkDescrs, did, Sets.newConcurrentHashSet());
    return ldescs.add(ldesc);
}

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From source file:org.opendaylight.atrium.util.AtriumGroupedThreadFactory.java

/**
 * Returns thread factory for producing threads associated with the specified
 * group name. The group name-space is hierarchical, based on slash-delimited
 * name segments, //from  ww  w . jav  a2  s .  com
 *
 * @param groupName group name
 * @return thread factory
 */
public static AtriumGroupedThreadFactory groupedThreadFactory(String groupName) {
    AtriumGroupedThreadFactory factory = FACTORIES.get(groupName);
    if (factory != null) {
        return factory;
    }

    // Find the parent group or root the group hierarchy under default group.
    int i = groupName.lastIndexOf(DELIMITER);
    if (i > 0) {
        String name = groupName.substring(0, i);
        ThreadGroup parentGroup = groupedThreadFactory(name).threadGroup();
        factory = new AtriumGroupedThreadFactory(new ThreadGroup(parentGroup, groupName));
    } else {
        factory = new AtriumGroupedThreadFactory(new ThreadGroup(groupName));
    }

    return ConcurrentUtils.putIfAbsent(FACTORIES, groupName, factory);
}

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