Example usage for java.util Map merge

Introduction

In this page you can find the example usage for java.util Map merge.

Prototype

default V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction)

Source Link

Document

If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value.

Usage

From source file:org.apache.hadoop.hbase.quotas.FileArchiverNotifierImpl.java

/**
 * For the given snapshot, find all files which this {@code snapshotName} references. After a file
 * is found to be referenced by the snapshot, it is removed from {@code filesToUpdate} and
 * {@code snapshotSizeChanges} is updated in concert.
 *
 * @param snapshotName The snapshot to check
 * @param filesToUpdate A mapping of archived files to their size
 * @param snapshotSizeChanges A mapping of snapshots and their change in size
 *//*from   w w  w.  j av a 2s  .c om*/
void bucketFilesToSnapshot(String snapshotName, Map<String, Long> filesToUpdate,
        Map<String, Long> snapshotSizeChanges) throws IOException {
    // A quick check to avoid doing work if the caller unnecessarily invoked this method.
    if (filesToUpdate.isEmpty()) {
        return;
    }

    Path snapshotDir = SnapshotDescriptionUtils.getCompletedSnapshotDir(snapshotName, FSUtils.getRootDir(conf));
    SnapshotDescription sd = SnapshotDescriptionUtils.readSnapshotInfo(fs, snapshotDir);
    SnapshotManifest manifest = SnapshotManifest.open(conf, fs, snapshotDir, sd);
    // For each region referenced by the snapshot
    for (SnapshotRegionManifest rm : manifest.getRegionManifests()) {
        // For each column family in this region
        for (FamilyFiles ff : rm.getFamilyFilesList()) {
            // And each store file in that family
            for (StoreFile sf : ff.getStoreFilesList()) {
                Long valueOrNull = filesToUpdate.remove(sf.getName());
                if (valueOrNull != null) {
                    // This storefile was recently archived, we should update this snapshot with its size
                    snapshotSizeChanges.merge(snapshotName, valueOrNull, Long::sum);
                }
                // Short-circuit, if we have no more files that were archived, we don't need to iterate
                // over the rest of the snapshot.
                if (filesToUpdate.isEmpty()) {
                    return;
                }
            }
        }
    }
}

From source file:org.apache.geode.management.internal.beans.DistributedSystemBridge.java

public Map<String, Boolean> viewRemoteClusterStatus() {
    if (mapOfGatewaySenders.values().size() > 0) {
        Map<String, Boolean> senderMap = new HashMap<>();
        for (GatewaySenderMXBean bean : mapOfGatewaySenders.values()) {
            Integer dsId = bean.getRemoteDSId();
            if (dsId != null) {
                senderMap.merge(dsId.toString(), bean.isRunning(), Boolean::logicalAnd);
            }/*  w  w w. jav a 2s .  c om*/
        }

        return senderMap;
    }

    return Collections.emptyMap();
}