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1. 

   环球UG官网

   (2021-01-17 12:52:03)     

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   1. 

      新2代理手机管理端

      (2021-05-10 09:33:56)     

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      好看得不得了，快来
      

// redis.clients.jedis.JedisSentinelPool#getResource
@Override
public Jedis getResource() {
while (true) {
// 调用父类方法获取实例
Jedis jedis = super.getResource();
jedis.setDataSource(this);
// get a reference because it can change concurrently
final HostAndPort master = currentHostMaster;
final HostAndPort connection = new HostAndPort(jedis.getClient().getHost(), jedis.getClient()
.getPort());
// host:port 比对，如果master未变化，说明获取到了正确的连接，返回
if (master.equals(connection)) {
// connected to the correct master
return jedis;
}
// 如果master 发生了切换，则将当前连接释放，继续尝试获取master连接
else {
returnBrokenResource(jedis);
}
}
}
// redis.clients.util.Pool#getResource
public T getResource() {
try {
return internalPool.borrowObject();
} catch (NoSuchElementException nse) {
throw new JedisException("Could not get a resource from the pool", nse);
} catch (Exception e) {
throw new JedisConnectionException("Could not get a resource from the pool", e);
}
}
// org.apache.commons.pool2.impl.GenericObjectPool#borrowObject()
@Override
public T borrowObject() throws Exception {
return borrowObject(getMaxWaitMillis());
}
// org.apache.commons.pool2.impl.GenericObjectPool#borrowObject(long)
public T borrowObject(final long borrowMaxWaitMillis) throws Exception {
assertOpen();
final AbandonedConfig ac = this.abandonedConfig;
if (ac != null && ac.getRemoveAbandonedOnBorrow() &&
(getNumIdle() < 2) &&
(getNumActive() > getMaxTotal() - 3) ) {
removeAbandoned(ac);
}
PooledObject<T> p = null;
// Get local copy of current config so it is consistent for entire
// method execution
final boolean blockWhenExhausted = getBlockWhenExhausted();
boolean create;
final long waitTime = System.currentTimeMillis();
while (p == null) {
create = false;
p = idleObjects.pollFirst();
if (p == null) {
// 没有获取到连接时，主动创建一个
p = create();
if (p != null) {
create = true;
}
}
if (blockWhenExhausted) {
if (p == null) {
if (borrowMaxWaitMillis < 0) {
p = idleObjects.takeFirst();
} else {
p = idleObjects.pollFirst(borrowMaxWaitMillis,
TimeUnit.MILLISECONDS);
}
}
if (p == null) {
throw new NoSuchElementException(
"Timeout waiting for idle object");
}
} else {
if (p == null) {
throw new NoSuchElementException("Pool exhausted");
}
}
if (!p.allocate()) {
p = null;
}
if (p != null) {
try {
// 确保激活当前数据库
factory.activateObject(p);
} catch (final Exception e) {
try {
destroy(p);
} catch (final Exception e1) {
// Ignore - activation failure is more important
}
p = null;
if (create) {
final NoSuchElementException nsee = new NoSuchElementException(
"Unable to activate object");
nsee.initCause(e);
throw nsee;
}
}
if (p != null && (getTestOnBorrow() || create && getTestOnCreate())) {
boolean validate = false;
Throwable validationThrowable = null;
try {
validate = factory.validateObject(p);
} catch (final Throwable t) {
PoolUtils.checkRethrow(t);
validationThrowable = t;
}
if (!validate) {
try {
destroy(p);
destroyedByBorrowValidationCount.incrementAndGet();
} catch (final Exception e) {
// Ignore - validation failure is more important
}
p = null;
if (create) {
final NoSuchElementException nsee = new NoSuchElementException(
"Unable to validate object");
nsee.initCause(validationThrowable);
throw nsee;
}
}
}
}
}
updateStatsBorrow(p, System.currentTimeMillis() - waitTime);
return p.getObject();
}
/**
* Attempts to create a new wrapped pooled object.
* <p>
* If there are {@link #getMaxTotal()} objects already in circulation
* or in process of being created, this method returns null.
*
* @return The new wrapped pooled object
*
* @throws Exception if the object factory's {@code makeObject} fails
*/
private PooledObject<T> create() throws Exception {
int localMaxTotal = getMaxTotal();
// This simplifies the code later in this method
if (localMaxTotal < 0) {
localMaxTotal = Integer.MAX_VALUE;
}
// Flag that indicates if create should:
// - TRUE: call the factory to create an object
// - FALSE: return null
// - null: loop and re-test the condition that determines whether to
// call the factory
Boolean create = null;
while (create == null) {
synchronized (makeObjectCountLock) {
final long newCreateCount = createCount.incrementAndGet();
if (newCreateCount > localMaxTotal) {
// The pool is currently at capacity or in the process of
// making enough new objects to take it to capacity.
createCount.decrementAndGet();
if (makeObjectCount == 0) {
// There are no makeObject() calls in progress so the
// pool is at capacity. Do not attempt to create a new
// object. Return and wait for an object to be returned
create = Boolean.FALSE;
} else {
// There are makeObject() calls in progress that might
// bring the pool to capacity. Those calls might also
// fail so wait until they complete and then re-test if
// the pool is at capacity or not.
makeObjectCountLock.wait();
}
} else {
// The pool is not at capacity. Create a new object.
makeObjectCount++;
create = Boolean.TRUE;
}
}
}
if (!create.booleanValue()) {
return null;
}
final PooledObject<T> p;
try {
// 调用指定factory的 makeObject() 方法
p = factory.makeObject();
} catch (final Exception e) {
createCount.decrementAndGet();
throw e;
} finally {
synchronized (makeObjectCountLock) {
makeObjectCount--;
makeObjectCountLock.notifyAll();
}
}
final AbandonedConfig ac = this.abandonedConfig;
if (ac != null && ac.getLogAbandoned()) {
p.setLogAbandoned(true);
}
createdCount.incrementAndGet();
allObjects.put(new IdentityWrapper<T>(p.getObject()), p);
return p;
}
// 使用 JedisFactory 创建一个连接到 master
// redis.clients.jedis.JedisFactory#makeObject
@Override
public PooledObject<Jedis> makeObject() throws Exception {
final HostAndPort hostAndPort = this.hostAndPort.get();
final Jedis jedis = new Jedis(hostAndPort.getHost(), hostAndPort.getPort(), connectionTimeout,
soTimeout, ssl, sslSocketFactory, sslParameters, hostnameVerifier);
try {
jedis.connect();
// 如果存在密码设置，则进行 auth xxx 操作
// redis 配置: requirepass xxx
if (null != this.password) {
jedis.auth(this.password);
}
if (database != 0) {
jedis.select(database);
}
if (clientName != null) {
jedis.clientSetname(clientName);
}
} catch (JedisException je) {
jedis.close();
throw je;
}
return new DefaultPooledObject<Jedis>(jedis);
}
// redis.clients.jedis.JedisFactory#activateObject
@Override
public void activateObject(PooledObject<Jedis> pooledJedis) throws Exception {
final BinaryJedis jedis = pooledJedis.getObject();
if (jedis.getDB() != database) {
jedis.select(database);
}
}

　　获取到client连接后，主可以任意地通过网络io与真实redis进行交互了。哨兵也不会成为性能问题了。同事让我来的

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