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Qiniu Cloud Storage SDK for Java
package com.qiniu.storage;
import com.qiniu.common.QiniuException;
import java.util.*;
class UpHostHelper {
private long failedPeriodMillis; // 毫秒 1/1000 s
private Configuration conf;
private LinkedHashMap regionHostsLRU =
new LinkedHashMap(1, 1.0f, true) {
@Override
protected boolean removeEldestEntry(Map.Entry eldest) {
return this.size() > 6;
}
};
UpHostHelper(Configuration conf, int failedPeriodSeconds) {
this.conf = conf;
this.failedPeriodMillis = failedPeriodSeconds * 1000L;
}
String upHost(Region region, String upToken, String lastUsedHost, boolean changeHost, boolean mustReturnUpHost) throws QiniuException {
RegionReqInfo regionReqInfo = new RegionReqInfo(upToken);
// auto region may failed here.
List accHosts;
List srcHosts;
try {
accHosts = region.getAccUpHost(regionReqInfo);
srcHosts = region.getSrcUpHost(regionReqInfo);
} catch (QiniuException e) { // it will success soon.
if (mustReturnUpHost && conf.useDefaultUpHostIfNone) {
return failedUpHost("failed_get_region");
} else {
throw e;
}
}
String regionKey = region.getRegion(regionReqInfo) + "_&//=_" + getRegionKey(srcHosts, accHosts);
RegionUpHost regionHost = regionHostsLRU.get(regionKey);
if (regionHost == null) {
regionHost = new RegionUpHost();
regionHostsLRU.put(regionKey, regionHost);
}
return regionHost.upHost(accHosts, srcHosts, lastUsedHost, changeHost);
}
private String failedUpHost(String regionKey) {
List srcHosts;
List accHosts;
RegionUpHost regionHost = regionHostsLRU.get(regionKey);
if (regionHost == null) {
regionHost = new RegionUpHost();
regionHostsLRU.put(regionKey, regionHost); // small ,do not need remove it.
}
if (regionHost.lastSrcHosts == null) {
accHosts = new ArrayList() {
{
this.add("upload.qiniup.com");
this.add("upload-z1.qiniup.com");
this.add("upload-z2.qiniup.com");
this.add("upload-na0.qiniup.com");
this.add("upload-as0.qiniup.com");
}
};
Collections.shuffle(accHosts); // ?
srcHosts = new ArrayList<>();
} else {
srcHosts = regionHost.lastSrcHosts;
accHosts = regionHost.lastAccHosts;
}
String host = regionHost.upHost(accHosts, srcHosts, null, false);
return host;
}
String getRegionKey(List srcHosts, List accHosts) {
String host = null;
String lhost = null;
for (String a : srcHosts) {
if (host == null) {
host = a;
lhost = a;
}
if (a.length() < host.length()) {
host = a;
}
if (a.length() > lhost.length()) {
lhost = a;
}
}
if (host != null) {
return host + ";+=-_" + lhost;
}
for (String a : accHosts) {
if (host == null) {
host = a;
lhost = a;
}
if (a.length() < host.length()) {
host = a;
}
if (a.length() > lhost.length()) {
lhost = a;
}
}
return host + ";+=-_" + lhost;
}
class RegionUpHost {
List lastAccHosts;
List lastSrcHosts;
HashMap hostMark = new HashMap<>();
ArrayList lastHosts;
volatile int mainHostCount = 0;
volatile String lastHost;
private void initHostMark(List f, List s) {
ArrayList _lastHosts = new ArrayList<>();
int _mainHostCount = 0;
if (f.size() > 0) {
_lastHosts.add(f.get(0));
_mainHostCount++;
}
if (s.size() > 0) {
_lastHosts.add(s.get(0));
_mainHostCount++;
}
// 后面的 host 乱序插入
int l = Math.min(f.size(), s.size());
int i = 1;
Random r = new Random();
ArrayList iidx = new ArrayList<>();
for (; i < l; i++) {
iidx.add(i);
}
randomAdd(_lastHosts, iidx, r, f, s);
// f or s ,checked by i < f.size() and i < s.size()
iidx.clear();
for (; i < f.size(); i++) {
iidx.add(i);
}
randomAdd(_lastHosts, iidx, r, f, null);
iidx.clear();
for (; i < s.size(); i++) {
iidx.add(i);
}
randomAdd(_lastHosts, iidx, r, s, null);
lastHosts = _lastHosts;
mainHostCount = _mainHostCount;
}
private void randomAdd(ArrayList _lastHosts, ArrayList iidx, Random r,
List list1, List list2) {
int size = iidx.size();
for (int j = 0; j < size; j++) {
int ji = r.nextInt(iidx.size());
Integer jv = iidx.remove(ji);
if (list1 != null) {
_lastHosts.add(list1.get(jv));
}
if (list2 != null) {
_lastHosts.add(list2.get(jv));
}
}
}
String upHost(List accHosts, List srcHosts, String lastUsedHost, boolean changeHost) {
if (lastAccHosts != accHosts || lastSrcHosts != srcHosts) {
lastAccHosts = accHosts;
lastSrcHosts = srcHosts;
synchronized (hostMark) {
hostMark.clear();
if (conf.accUpHostFirst) {
initHostMark(lastAccHosts, lastSrcHosts);
} else {
initHostMark(lastSrcHosts, lastAccHosts);
}
lastHost = lastHosts.get(0); // at last one domain
}
}
long t = System.currentTimeMillis() - failedPeriodMillis;
// acc src 的第一个，比如(upload.qiniup.com, up.qiniup.com), //
// 作为主上传域名，可以继续使用，不用恢复到 lastHosts.get(0) //
// 优先处理 //
if (!changeHost) {
Long el0 = hostMark.get(lastHost);
if (el0 == null) {
el0 = 0L;
}
if (el0 < t) {
int lastUsedIdx = lastHosts.indexOf(lastHost);
if (lastUsedIdx > -1 && lastUsedIdx < mainHostCount) {
return lastHost;
}
}
if (lastUsedHost != null && !lastHost.equals(lastUsedHost)) {
Long el = hostMark.get(lastUsedHost);
if (el == null) {
el = 0L;
}
if (el < t) {
int lastUsedIdx = lastHosts.indexOf(lastUsedHost);
if (lastUsedIdx > -1 && lastUsedIdx < mainHostCount) {
lastHost = lastUsedHost;
return lastUsedHost;
}
}
}
}
if (changeHost) {
synchronized (hostMark) {
// uploader 使用的的 host 与 本地记录的 host 不一样，直接返回本地记录的 host，这也是新的 host //
// 减少 多个同时失败，大量同时更改 host，导致 将 host 该回到 老的无效 host //
String host = lastUsedHost != null ? lastUsedHost : lastHost;
if (!lastHost.equals(host)) {
Long el = hostMark.get(lastHost);
if (el == null) {
el = 0L;
}
if (el < t) {
return lastHost;
}
}
// 标记当前 host 不可用 //
hostMark.put(host, System.currentTimeMillis());
}
}
// 下方 未加锁，仍有可能 重复更改 host ，加 return lastHost; 可能会减少这种几率 //
String _lastHost = lastHost;
// 标记过期后，恢复到 优先使用 第一个 值 //
for (String h : lastHosts) {
Long e = hostMark.get(h);
if (e == null) {
e = 0L;
}
// 不可用标志已过期，即域名可以使用 //
if (e < t) {
lastHost = h;
return h;
} else {
// 单线程，下面代码没什么意义. //
// 其它线程调用了 upHost(true)，可能改变 lastHost 状态，提前返回，不用进入 "全部标记为不可用" //
if (_lastHost != lastHost) {
return lastHost;
}
}
}
// 全部标记为不可用 //
// 清空所有标记，重新开始 //
synchronized (hostMark) {
hostMark.clear();
lastHost = lastHosts.get(0); // must be in synchronized . lastHosts.clear() //
}
return lastHost;
}
}
}
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