import org.apache.hadoop.util.LightWeightCache; //导入依赖的package包/类
/**
 * Constructor.
 * @param cacheSize The size of the access privilege cache.
 * @param expirationPeriodNano The period 
 * @param matchingHosts A string specifying one or multiple matchers. 
 */
NfsExports(int cacheSize, long expirationPeriodNano, String matchHosts) {
  this.cacheExpirationPeriod = expirationPeriodNano;
  accessCache = new LightWeightCache<AccessCacheEntry, AccessCacheEntry>(
      cacheSize, cacheSize, expirationPeriodNano, 0);        
  String[] matchStrings = matchHosts.split(
      CommonConfigurationKeys.NFS_EXPORTS_ALLOWED_HOSTS_SEPARATOR);
  mMatches = new ArrayList<Match>(matchStrings.length);
  for(String mStr : matchStrings) {
    if (LOG.isDebugEnabled()) {
      LOG.debug("Processing match string '" + mStr + "'");
    }
    mStr = mStr.trim();
    if(!mStr.isEmpty()) {
      mMatches.add(getMatch(mStr));
    }
  }
}
 

import org.apache.hadoop.util.LightWeightCache; //导入依赖的package包/类
/**
 * Constructor.
 * @param cacheSize The size of the access privilege cache.
 * @param expirationPeriodNano The period 
 * @param matchingHosts A string specifying one or multiple matchers. 
 */
NfsExports(int cacheSize, long expirationPeriodNano, String matchHosts) {
  this.cacheExpirationPeriod = expirationPeriodNano;
  accessCache = new LightWeightCache<AccessCacheEntry, AccessCacheEntry>(
      cacheSize, cacheSize, expirationPeriodNano, 0);        
  String[] matchStrings = matchHosts.split(
      Nfs3Constant.EXPORTS_ALLOWED_HOSTS_SEPARATOR);
  mMatches = new ArrayList<Match>(matchStrings.length);
  for(String mStr : matchStrings) {
    if (LOG.isDebugEnabled()) {
      LOG.debug("Processing match string '" + mStr + "'");
    }
    mStr = mStr.trim();
    if(!mStr.isEmpty()) {
      mMatches.add(getMatch(mStr));
    }
  }
}
 

import org.apache.hadoop.util.LightWeightCache; //导入依赖的package包/类
/**
 * Constructor
 * @param cacheName name to identify the cache by
 * @param percentage percentage of total java heap space used by this cache
 * @param expirationTime time for an entry to expire in nanoseconds
 */
public RetryCache(String cacheName, double percentage, long expirationTime) {
  int capacity = LightWeightGSet.computeCapacity(percentage, cacheName);
  capacity = capacity > MAX_CAPACITY ? capacity : MAX_CAPACITY;
  this.set = new LightWeightCache<CacheEntry, CacheEntry>(capacity, capacity,
      expirationTime, 0);
  this.expirationTime = expirationTime;
  this.cacheName = cacheName;
  this.retryCacheMetrics =  RetryCacheMetrics.create(this);
}
 

import org.apache.hadoop.util.LightWeightCache; //导入依赖的package包/类
/**
 * Constructor
 * @param cacheName name to identify the cache by
 * @param percentage percentage of total java heap space used by this cache
 * @param expirationTime time for an entry to expire in nanoseconds
 */
public RetryCache(String cacheName, double percentage, long expirationTime) {
  int capacity = LightWeightGSet.computeCapacity(percentage, cacheName);
  capacity = capacity > 16 ? capacity : 16;
  this.set = new LightWeightCache<CacheEntry, CacheEntry>(capacity, capacity,
      expirationTime, 0);
  this.expirationTime = expirationTime;
  this.cacheName = cacheName;
  this.retryCacheMetrics =  RetryCacheMetrics.create(this);
}
 

import org.apache.hadoop.util.LightWeightCache; //导入依赖的package包/类
/**
 * Constructor
 * @param cacheName name to identify the cache by
 * @param percentage percentage of total java heap space used by this cache
 * @param expirationTime time for an entry to expire in nanoseconds
 */
public RetryCache(String cacheName, double percentage, long expirationTime) {
  int capacity = LightWeightGSet.computeCapacity(percentage, cacheName);
  capacity = capacity > 16 ? capacity : 16;
  this.set = new LightWeightCache<CacheEntry, CacheEntry>(capacity, capacity,
      expirationTime, 0);
  this.expirationTime = expirationTime;
}