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rocksdb/thrift/lib/cpp/util/TNonblockingServerCreator.h

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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#ifndef THRIFT_UTIL_TNONBLOCKINGSERVERCREATOR_H_
#define THRIFT_UTIL_TNONBLOCKINGSERVERCREATOR_H_ 1
#include "thrift/lib/cpp/util/ServerCreatorBase.h"
#include "thrift/lib/cpp/server/TNonblockingServer.h"
#include "thrift/lib/cpp/transport/TSocket.h"
namespace apache { namespace thrift {
class TProcessor;
namespace util {
class TNonblockingServerCreator : public ServerCreatorBase {
public:
typedef server::TNonblockingServer ServerType;
/// Use 8 task threads by default.
static const size_t DEFAULT_NUM_TASK_THREADS = 8;
/// Use 1 I/O thread by default.
static const size_t DEFAULT_NUM_IO_THREADS = 1;
/**
* By default, just run the I/O threads with the same priority as other
* threads.
*/
static const bool DEFAULT_HI_PRI_IO_THREADS = false;
/// Default limit on the size of the idle connection pool
static const size_t DEFAULT_CONN_STACK_LIMIT = 1024;
/// Default limit on the total number of connected sockets
static const size_t DEFAULT_MAX_CONNECTIONS = INT_MAX;
/// Default limit on the number of outstanding requests
static const size_t DEFAULT_MAX_ACTIVE_PROCESSORS = INT_MAX;
/**
* By default, reject requests over 256MB.
*
* This avoids allocating giant buffers if a client sends a bogus frame
* length.
*/
static const size_t DEFAULT_MAX_FRAME_SIZE = 256 * 1024 * 1024;
/// Default overload hysteresis fraction
static const double DEFAULT_HYSTERESIS_FRACTION;
/**
* Default overload action.
*
* TODO: None of the TNonblockingServer OverloadAction behaviors seem like
* reasonable defaults. If the overload is occurring because we hit the
* maxConnections limit, it seems like the best behavior is to try and close
* idle connections. If the overload is occurring due to the
* maxActiveProcessors limit, it seems like the best behavior may be to stop
* calling accept() and stop reading on sockets until the # of active
* processors drops to a reasonable limit.
*/
static const server::TOverloadAction DEFAULT_OVERLOAD_ACTION =
server::T_OVERLOAD_NO_ACTION;
/**
* By default, give up on a request if we can't find a thread to process it
* within 30 seconds.
*/
static const int64_t DEFAULT_TASK_EXPIRE_TIME = 30000;
/// Default size of write buffer
static const size_t DEFAULT_WRITE_BUFFER_SIZE = 1024;
/// Maximum size of read buffer allocated to each idle connection
static const size_t DEFAULT_IDLE_READ_BUF_LIMIT = 8192;
/// Maximum size of write buffer allocated to each idle connection
static const size_t DEFAULT_IDLE_WRITE_BUF_LIMIT = 8192;
/**
* By check to see if we should shrink oversized read/write buffers after
* every 64 calls on connection.
*/
static const int DEFAULT_RESIZE_EVERY_N = 64;
/// listen backlog
static const size_t DEFAULT_LISTEN_BACKLOG = 1024;
/**
* Create a new TNonblockingServerCreator.
*/
TNonblockingServerCreator(const boost::shared_ptr<TProcessor>& processor,
uint16_t port,
size_t numTaskThreads = DEFAULT_NUM_TASK_THREADS);
/**
* Set the number of threads to use for processing requests.
*
* Setting this to 0 causes all requests to be processed in the I/O
* thread(s). You should only set this to 0 if the handler responds to all
* requests immediately, without ever blocking.
*/
void setNumTaskThreads(size_t numThreads) {
numTaskThreads_ = numThreads;
}
/**
* Set the ThreadFactory to use for creating the task threads.
*/
void setTaskThreadFactory(
const boost::shared_ptr<concurrency::ThreadFactory>& threadFactory) {
taskThreadFactory_ = threadFactory;
}
/**
* Set the number of threads to use for performing I/O.
*/
void setNumIOThreads(size_t numThreads) {
numIOThreads_ = numThreads;
}
/**
* Set whether or not the I/O threads should be given a higher scheduling
* priority.
*/
void setUseHighPriorityIOThreads(bool useHiPri) {
useHiPriIOThreads_ = useHiPri;
}
/**
* Set the maximum number of TConnection objects to cache.
*
* By default, when a connection is closed TNonblockingServer caches the
* TConnection object and re-uses it when a new connection comes in, instead
* of deleting it and allocating a new one for the next connection. This
* value caps the number of unused TConnection objects that will be cached.
*/
void setConnectionStackLimit(size_t limit) {
connectionStackLimit_ = limit;
}
/// Set the maximum number of open connections
void setMaxConnections(size_t maxConnections) {
maxConnections_ = maxConnections;
}
/// Set the maximum number of active requests
void setMaxActiveProcessors(size_t maxActiveProcessors) {
maxActiveProcessors_ = maxActiveProcessors;
}
/// Set the maximum allowed request frame size.
void setMaxFrameSize(size_t maxFrameSize) {
maxFrameSize_ = maxFrameSize;
}
/// Set the overload hysteresis fraction
void setOverloadHysteresis(double hysteresisFraction) {
hysteresisFraction_ = hysteresisFraction;
}
/// Set the overload action
void setOverloadAction(server::TOverloadAction action) {
overloadAction_ = action;
}
/**
* Set the task expiration time.
*
* If no task thread is available to process a request within taskExpireTime
* milliseconds, close the connection rather than continuing to wait for a
* thread. If the server is overloaded, this prevents it from processing
* old requests that the client has already given up on.
*/
void setTaskExpireTime(int64_t taskExpireTime) {
taskExpireTime_ = taskExpireTime;
}
/**
* Set the socket options to use for accepted connections
*/
void setSocketOptions(const transport::TSocket::Options& options) {
socketOptions_ = options;
}
/// Set the default write buffer size for new connections
void setWriteBufferDefaultSize(size_t size) {
defaultWriteBufferSize_ = size;
}
/**
* Set the maximum read buffer size for idle connections.
*
* This value is checked when the connection is closed, and also every N
* connections if setResizeBufferEveryN() has been set. If the read buffer
* is larger than the allowed limit, free it.
*
* This prevents a single large request on a connection from continuing to
* taking up a lot of buffer space.
*/
void setIdleReadBufferLimit(size_t limit) {
idleReadBufferLimit_ = limit;
}
/**
* Set the maximum write buffer size for idle connections.
*
* This value is checked when the connection is closed, and also every N
* connections if setResizeBufferEveryN() has been set. If the write buffer
* is larger than the allowed limit, free it.
*
* This prevents a single large response on a connection from continuing to
* taking up a lot of buffer space.
*/
void setIdleWriteBufferLimit(size_t limit) {
idleWriteBufferLimit_ = limit;
}
/// Check a connection's buffer size limits every count requests.
void setResizeBufferEveryN(int32_t count) {
resizeBufferEveryN_ = count;
}
/// listen backlog
void setListenBacklog(int32_t listenBacklog) {
listenBacklog_ = listenBacklog;
}
virtual boost::shared_ptr<server::TServer> createServer();
boost::shared_ptr<server::TNonblockingServer> createNonblockingServer();
private:
boost::shared_ptr<TProcessor> processor_;
uint16_t port_;
size_t numTaskThreads_;
size_t numIOThreads_;
bool useHiPriIOThreads_;
size_t connectionStackLimit_;
size_t maxConnections_;
size_t maxActiveProcessors_;
size_t maxFrameSize_;
double hysteresisFraction_;
server::TOverloadAction overloadAction_;
int64_t taskExpireTime_;
size_t defaultWriteBufferSize_;
size_t idleReadBufferLimit_;
size_t idleWriteBufferLimit_;
int32_t resizeBufferEveryN_;
int32_t listenBacklog_;
transport::TSocket::Options socketOptions_;
boost::shared_ptr<concurrency::ThreadFactory> taskThreadFactory_;
};
}}} // apache::thrift::util
#endif // THRIFT_UTIL_TNONBLOCKINGSERVERCREATOR_H_