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rocksdb/thrift/lib/cpp/async/TEventServer.h
Dhruba Borthakur b40ad060e0 Implement the FB-Assoc API via thrift. 
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2012-08-01 16:18:24 -07:00

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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_ASYNC_TEVENTSERVER_H_
#define THRIFT_ASYNC_TEVENTSERVER_H_ 1
#include "thrift/lib/cpp/Thrift.h"
#include "thrift/lib/cpp/server/TServer.h"
#include "thrift/lib/cpp/async/TAsyncProcessor.h"
#include "thrift/lib/cpp/transport/TTransportUtils.h"
#include "thrift/lib/cpp/transport/TSSLSocket.h"
#include "thrift/lib/cpp/protocol/THeaderProtocol.h"
#include "thrift/lib/cpp/concurrency/Mutex.h"
#include "thrift/lib/cpp/concurrency/ThreadLocal.h"
#include "thrift/lib/cpp/async/TEventBase.h"
#include "thrift/lib/cpp/async/TEventBaseManager.h"
#include <vector>
#include <map>
#include <cstdlib>
#include <boost/scoped_ptr.hpp>
namespace apache { namespace thrift {
namespace concurrency {
class ThreadFactory;
class ThreadManager;
}
namespace async {
using apache::thrift::protocol::TDualProtocolFactory;
// Forward declaration of classes
class TAsyncServerSocket;
class TEventConnection;
class TEventWorker;
/**
This is a non-blocking event-based server for high performance that
operates an I/O thread for each cpu core and uses callbacks for
notification of processing or I/O operations.
It does not use the TServerTransport framework, but rather has socket
operations hardcoded for use with libevent and implements framing
compatible with TFramedTransport. A single "listener" thread accepts
connections and sends them to the server threads via a single socketpair();
the server threads are each responsible for allocating and pooling actual
connection objects, avoiding the need for the locks required by a common
pool.
The original Thrift server was by Mark Slee <mcslee@facebook.com>.
A non-blocking variant was produced which allowed for a large number
of processing threads but restricted network I/O to a single thread --
suboptimal on a multi-core CPU. David Reiss <dreiss@facebook.com>
and Mark Rabkin <mrabkin@facebook.com> refactored this server into a
callback-driven event-based configuration. Ed Hall <edhall@facebook.com>
elaborated on this to support network I/O on multiple threads (ideally
one per CPU core).
@author Mark Slee <mcslee@facebook.com>
@author David Reiss <dreiss@facebook.com>
@author Mark Rabkin <mrabkin@facebook.com>
@author Ed Hall <edhall@facebook.com>
*/
class TEventServer : public apache::thrift::server::TServer {
public:
enum TransportType {
FRAMED = 0,
HEADER = 1,
/*********** Deprecation Warning *******************
* *
* The unframed transports are deprecated ! *
* They should be used for legancy services only *
* Also note: they only works with TBinaryProtocol *
***************************************************/
UNFRAMED_BINARY = 2
};
protected:
//! Default max size of per-worker connection pool.
static const uint32_t T_ASYNC_MAX_CONNECTION_POOL_SIZE = 64;
/// Starting size of a TEventConnection's read buffer
static const int T_ASYNC_READ_BUFFER_DEFAULT_SIZE = 1024;
/// Starting size of a TEventConnection's write buffer
static const int T_ASYNC_WRITE_BUFFER_DEFAULT_SIZE = 1024;
/// Maximum size of read buffer allocated to idle connection (0 = unlimited)
static const int T_ASYNC_IDLE_READ_BUFFER_LIMIT = 0;
/// Maximum size of write buffer allocated to idle connection (0 = unlimited)
static const int T_ASYNC_IDLE_WRITE_BUFFER_LIMIT = 0;
/// # of calls before resizing oversized buffers (0 = check only on close)
static const int T_ASYNC_RESIZE_BUFFER_EVERY_N = 0;
//! Default number of worker threads (should be # of processor cores).
static const int T_ASYNC_DEFAULT_WORKER_THREADS = 4;
//! Maximum size of a frame we'll accept (default = 64MB)
static const int T_ASYNC_DEFAULT_MAX_FRAME_SIZE = 67108864;
static const uint32_t T_MAX_NUM_MESSAGES_IN_PIPE = 0xffffffff;
/// Listen backlog
static const int T_LISTEN_BACKLOG = 1024;
//! Transport type
static const TransportType T_ASYNC_DEFAULT_TRANSPORT_TYPE = FRAMED;
private:
struct WorkerInfo {
boost::shared_ptr<TEventWorker> worker;
boost::shared_ptr<apache::thrift::concurrency::Thread> thread;
};
//! Max size of per-worker connection pool (may be set).
uint32_t maxConnectionPoolSize_;
//! SSL context
boost::shared_ptr<transport::SSLContext> sslContext_;
//! Factory that creates connection processor objects.
boost::shared_ptr<TAsyncProcessorFactory> asyncProcessorFactory_;
//! Port to listen on
uint16_t port_;
//! Listen socket
TAsyncServerSocket* socket_;
//! The TEventBase currently driving serve(). NULL when not serving.
TEventBase* serveEventBase_;
//! Number of worker threads (may be set) (should be # of CPU cores)
int nWorkers_;
//! Milliseconds we'll wait for data to appear (0 = infinity)
int timeout_;
//! Manager of per-thread TEventBase objects.
TEventBaseManager eventBaseManager_;
//! Last worker chosen -- used to select workers in round-robin sequence.
uint32_t workerChoice_;
//! List of workers.
typedef std::vector<WorkerInfo> WorkerVector;
WorkerVector workers_;
//! Maximum number of bytes accepted in a frame.
uint32_t maxFrameSize_;
/// We initialize (and reinitialize) TEventConnection's read buffer to
/// this size.
size_t readBufferDefaultSize_;
/// We initialize (and reinitialize) TEventConnection's write buffer to
/// this size.
size_t writeBufferDefaultSize_;
/**
* Max read buffer size for an idle TConnection. When we place an idle
* TConnection into TEventWorker::connectionStack_ or on every
* resizeBufferEveryN_ calls, we insure that its read buffer is <= to
* this size; otherwise we replace it with a new one to insure that idle
* connections don't hog memory. 0 disables this check.
*/
size_t idleReadBufferLimit_;
/**
* Max write buffer size for an idle connection. When we place an idle
* TConnection into TEventWorker::connectionStack_ or on every
* resizeBufferEveryN_ calls, we insure that its write buffer is <= to
* this size; otherwise we replace it with a new one to insure that idle
* connections don't hog memory. 0 disables this check.
*/
size_t idleWriteBufferLimit_;
/**
* Every N calls we check the buffer size limits on a connected
* TEventConnection. 0 disables (i.e. the checks are only done when a
* connection closes).
*/
int32_t resizeBufferEveryN_;
/**
* Call timeout in ms. When nonzero, limits the amount of time we allow
* between the start of a call and the actual invokation of its processor.
* The connection closes if it is exceeded.
*/
int32_t callTimeout_;
/**
* The thread manager used when we're in queuing mode.
*/
boost::shared_ptr<concurrency::ThreadManager> threadManager_;
/**
* Thread local storage to track the current connection being processed
*/
concurrency::ThreadLocal<TEventConnection,
concurrency::NoopThreadLocalManager<TEventConnection> >
currentConnection_;
/**
* The time in milliseconds before an unperformed task expires --
* queuing mode only. (0 == infinite)
*/
uint64_t taskExpireTime_;
/**
* Set true if we are in queuing mode, false if not.
*/
bool queuingMode_;
/**
* The speed for adjusting connection accept rate.
* 0 for disabling auto adjusting connection accept rate.
*/
double acceptRateAdjustSpeed_;
/**
* The maximum number of unprocessed messages which a NotificationPipe
* can hold.
*/
uint32_t maxNumMsgsInPipe_;
/**
* The max number of active connections for each worker
*/
int32_t maxNumActiveConnectionsPerWorker_;
/**
* The transport type to use
*/
TransportType transportType_;
void addWorker(concurrency::ThreadFactory* threadFactory);
/**
* No-op signal handler (for SIGPIPE)
*/
static void sigNoOp(int signo) {
(void)signo;
}
/**
* Set the current connection
*/
void setCurrentConnection(TEventConnection* conn) {
assert(currentConnection_.get() == NULL);
currentConnection_.set(conn);
}
/**
* Clear the current connection
*/
void clearCurrentConnection() {
currentConnection_.clear();
}
// Allow TEventConnection and TEventTask to access setCurrentConnection()
// and clearCurrentConnection(). Only these two private
// methods are meant to be used by TEventConnection and TEventTask.
friend class TEventConnection;
friend class TEventTask;
public:
/** Construct an async Thrift server.
You need to compile your thrift configuration with thrift_cpp_options =
"cob_style" to get the required TAsyncProcessor class; this differs
from the usual TProcessor object by adding a completion callback.
TBinaryProtocol is assumed for both input and output with this
constructor.
@param processor the TAsyncProcessor object for this service
@param port the TCP port number for this service
@param nWorkers the number of worker threads -- should be the same
as the number of CPU cores, though if a process has
more than one TEventServer the cores can be split
between them.
*/
template<typename AsyncProcessor>
TEventServer(boost::shared_ptr<AsyncProcessor> processor,
int port,
int nWorkers = T_ASYNC_DEFAULT_WORKER_THREADS,
THRIFT_OVERLOAD_IF(AsyncProcessor, TAsyncProcessor)) :
apache::thrift::server::TServer(boost::shared_ptr<TProcessor>()),
maxConnectionPoolSize_(T_ASYNC_MAX_CONNECTION_POOL_SIZE),
asyncProcessorFactory_(new TAsyncSingletonProcessorFactory(processor)),
port_(port),
socket_(NULL),
serveEventBase_(NULL),
nWorkers_(nWorkers),
timeout_(0),
eventBaseManager_(),
workerChoice_(0),
maxFrameSize_(T_ASYNC_DEFAULT_MAX_FRAME_SIZE),
readBufferDefaultSize_(T_ASYNC_READ_BUFFER_DEFAULT_SIZE),
writeBufferDefaultSize_(T_ASYNC_WRITE_BUFFER_DEFAULT_SIZE),
idleReadBufferLimit_(T_ASYNC_IDLE_READ_BUFFER_LIMIT),
idleWriteBufferLimit_(T_ASYNC_IDLE_WRITE_BUFFER_LIMIT),
resizeBufferEveryN_(T_ASYNC_RESIZE_BUFFER_EVERY_N),
callTimeout_(0),
taskExpireTime_(0),
queuingMode_(false),
acceptRateAdjustSpeed_(0),
maxNumMsgsInPipe_(T_MAX_NUM_MESSAGES_IN_PIPE),
maxNumActiveConnectionsPerWorker_(0),
transportType_(T_ASYNC_DEFAULT_TRANSPORT_TYPE) {
processor->setAsyncServer(this);
}
/** Construct an async Thrift server for a particular TProtocol.
See above; adds a "protocolFactory" parameter to replace the
default TBinaryProtocol.
@param processor the TAsyncProcessor object for this service
@param protocolFactory the TProtocolFactory to use for input & output
@param port the TCP port number for this service
@param nWorkers the number of worker threads
*/
template<typename AsyncProcessor>
TEventServer(boost::shared_ptr<AsyncProcessor> processor,
boost::shared_ptr<apache::thrift::protocol::TProtocolFactory>
protocolFactory,
int port,
int nWorkers = T_ASYNC_DEFAULT_WORKER_THREADS,
THRIFT_OVERLOAD_IF(AsyncProcessor, TAsyncProcessor)) :
apache::thrift::server::TServer(boost::shared_ptr<TProcessor>()),
maxConnectionPoolSize_(T_ASYNC_MAX_CONNECTION_POOL_SIZE),
asyncProcessorFactory_(new TAsyncSingletonProcessorFactory(processor)),
port_(port),
socket_(NULL),
serveEventBase_(NULL),
nWorkers_(nWorkers),
timeout_(0),
eventBaseManager_(),
workerChoice_(0),
maxFrameSize_(T_ASYNC_DEFAULT_MAX_FRAME_SIZE),
readBufferDefaultSize_(T_ASYNC_READ_BUFFER_DEFAULT_SIZE),
writeBufferDefaultSize_(T_ASYNC_WRITE_BUFFER_DEFAULT_SIZE),
idleReadBufferLimit_(T_ASYNC_IDLE_READ_BUFFER_LIMIT),
idleWriteBufferLimit_(T_ASYNC_IDLE_WRITE_BUFFER_LIMIT),
resizeBufferEveryN_(T_ASYNC_RESIZE_BUFFER_EVERY_N),
callTimeout_(0),
taskExpireTime_(0),
queuingMode_(false),
acceptRateAdjustSpeed_(0),
maxNumMsgsInPipe_(T_MAX_NUM_MESSAGES_IN_PIPE),
maxNumActiveConnectionsPerWorker_(0),
transportType_(T_ASYNC_DEFAULT_TRANSPORT_TYPE) {
processor->setAsyncServer(this);
setProtocolFactory(protocolFactory);
}
/** Construct an async Thrift server with different input & output TProtocol.
See above; adds "inputProtocolFactory" and "outputProtocolFactory"
parameters.
@param processor the TAsyncProcessor object for this service
@param inputProtocolFactory the TProtocolFactory to use for input
@param outputProtocolFactory the TProtocolFactory to use for output
@param port the TCP port number for this service
@param nWorkers the number of worker threads
@deprecated use TDuplex* ctor below
*/
template<typename AsyncProcessor>
TEventServer(boost::shared_ptr<AsyncProcessor> processor,
boost::shared_ptr<apache::thrift::protocol::TProtocolFactory>
inputProtocolFactory,
boost::shared_ptr<apache::thrift::protocol::TProtocolFactory>
outputProtocolFactory,
int port,
int nWorkers = T_ASYNC_DEFAULT_WORKER_THREADS,
THRIFT_OVERLOAD_IF(AsyncProcessor, TAsyncProcessor)) :
apache::thrift::server::TServer(boost::shared_ptr<TProcessor>()),
maxConnectionPoolSize_(T_ASYNC_MAX_CONNECTION_POOL_SIZE),
asyncProcessorFactory_(new TAsyncSingletonProcessorFactory(processor)),
port_(port),
socket_(NULL),
serveEventBase_(NULL),
nWorkers_(nWorkers),
timeout_(0),
eventBaseManager_(),
workerChoice_(0),
maxFrameSize_(T_ASYNC_DEFAULT_MAX_FRAME_SIZE),
readBufferDefaultSize_(T_ASYNC_READ_BUFFER_DEFAULT_SIZE),
writeBufferDefaultSize_(T_ASYNC_WRITE_BUFFER_DEFAULT_SIZE),
idleReadBufferLimit_(T_ASYNC_IDLE_READ_BUFFER_LIMIT),
idleWriteBufferLimit_(T_ASYNC_IDLE_WRITE_BUFFER_LIMIT),
resizeBufferEveryN_(T_ASYNC_RESIZE_BUFFER_EVERY_N),
callTimeout_(0),
taskExpireTime_(0),
queuingMode_(false),
acceptRateAdjustSpeed_(0),
maxNumMsgsInPipe_(T_MAX_NUM_MESSAGES_IN_PIPE),
maxNumActiveConnectionsPerWorker_(0),
transportType_(T_ASYNC_DEFAULT_TRANSPORT_TYPE) {
processor->setAsyncServer(this);
setDuplexProtocolFactory(
boost::shared_ptr<TDualProtocolFactory>(
new TDualProtocolFactory(inputProtocolFactory, outputProtocolFactory)));
}
/** Construct an async Thrift server with custom input & output TProtocol.
See above; Replaces protocolFactory with duplexProtocolFactory
parameters.
@param processor the TAsyncProcessor object for this service
@param duplexProtocolFactory the TProtocolFactory to use for input/output
@param port the TCP port number for this service
@param nWorkers the number of worker threads
*/
template<typename AsyncProcessor>
TEventServer(
boost::shared_ptr<AsyncProcessor> processor,
boost::shared_ptr<apache::thrift::protocol::TDuplexProtocolFactory>
duplexProtocolFactory,
int port,
int nWorkers = T_ASYNC_DEFAULT_WORKER_THREADS,
THRIFT_OVERLOAD_IF(AsyncProcessor, TAsyncProcessor)):
apache::thrift::server::TServer(boost::shared_ptr<TProcessor>()),
maxConnectionPoolSize_(T_ASYNC_MAX_CONNECTION_POOL_SIZE),
asyncProcessorFactory_(new TAsyncSingletonProcessorFactory(processor)),
port_(port),
socket_(NULL),
serveEventBase_(NULL),
nWorkers_(nWorkers),
timeout_(0),
eventBaseManager_(),
workerChoice_(0),
maxFrameSize_(T_ASYNC_DEFAULT_MAX_FRAME_SIZE),
readBufferDefaultSize_(T_ASYNC_READ_BUFFER_DEFAULT_SIZE),
writeBufferDefaultSize_(T_ASYNC_WRITE_BUFFER_DEFAULT_SIZE),
idleReadBufferLimit_(T_ASYNC_IDLE_READ_BUFFER_LIMIT),
idleWriteBufferLimit_(T_ASYNC_IDLE_WRITE_BUFFER_LIMIT),
resizeBufferEveryN_(T_ASYNC_RESIZE_BUFFER_EVERY_N),
callTimeout_(0),
taskExpireTime_(0),
queuingMode_(false),
acceptRateAdjustSpeed_(0),
maxNumMsgsInPipe_(T_MAX_NUM_MESSAGES_IN_PIPE),
maxNumActiveConnectionsPerWorker_(0),
transportType_(T_ASYNC_DEFAULT_TRANSPORT_TYPE) {
processor->setAsyncServer(this);
setDuplexProtocolFactory(duplexProtocolFactory);
}
/** Construct a task-queuing Thrift server for a particular TProtocol.
Largely compatible with TNonblockingServer.
@param processor the TProcessor object for this service
@param protocolFactory the TProtocolFactory to use for input & output
@param port the TCP port number for this service
@param threadManager the thread manager we use for task queuing
@param nWorkers the number of worker threads
*/
template<typename Processor>
TEventServer(
boost::shared_ptr<Processor> processor,
boost::shared_ptr<apache::thrift::protocol::TProtocolFactory>
protocolFactory,
int port,
boost::shared_ptr<concurrency::ThreadManager> const& threadManager =
boost::shared_ptr<concurrency::ThreadManager>(),
int nWorkers = T_ASYNC_DEFAULT_WORKER_THREADS,
THRIFT_OVERLOAD_IF(Processor, TProcessor)) :
apache::thrift::server::TServer(processor),
maxConnectionPoolSize_(T_ASYNC_MAX_CONNECTION_POOL_SIZE),
port_(port),
socket_(NULL),
serveEventBase_(NULL),
nWorkers_(nWorkers),
timeout_(0),
eventBaseManager_(),
workerChoice_(0),
maxFrameSize_(T_ASYNC_DEFAULT_MAX_FRAME_SIZE),
readBufferDefaultSize_(T_ASYNC_READ_BUFFER_DEFAULT_SIZE),
writeBufferDefaultSize_(T_ASYNC_WRITE_BUFFER_DEFAULT_SIZE),
idleReadBufferLimit_(T_ASYNC_IDLE_READ_BUFFER_LIMIT),
idleWriteBufferLimit_(T_ASYNC_IDLE_WRITE_BUFFER_LIMIT),
resizeBufferEveryN_(T_ASYNC_RESIZE_BUFFER_EVERY_N),
callTimeout_(0),
taskExpireTime_(0),
queuingMode_(true),
acceptRateAdjustSpeed_(0),
maxNumMsgsInPipe_(T_MAX_NUM_MESSAGES_IN_PIPE),
maxNumActiveConnectionsPerWorker_(0),
transportType_(T_ASYNC_DEFAULT_TRANSPORT_TYPE) {
setProtocolFactory(protocolFactory);
setThreadManager(threadManager);
}
/** Construct a task-queuing Thrift server for a particular TProtocol.
Largely compatible with TNonblockingServer.
@param processor the TProcessor object for this service
@param protocolFactory the TProtocolFactory to use for input & output
@param port the TCP port number for this service
@param threadManager the thread manager we use for task queuing
@param nWorkers the number of worker threads
*/
template<typename Processor>
TEventServer(
boost::shared_ptr<Processor> processor,
boost::shared_ptr<apache::thrift::protocol::TDuplexProtocolFactory>
duplexProtocolFactory,
int port,
boost::shared_ptr<concurrency::ThreadManager> const& threadManager =
boost::shared_ptr<concurrency::ThreadManager>(),
int nWorkers = T_ASYNC_DEFAULT_WORKER_THREADS,
THRIFT_OVERLOAD_IF(Processor, TProcessor)) :
apache::thrift::server::TServer(processor),
maxConnectionPoolSize_(T_ASYNC_MAX_CONNECTION_POOL_SIZE),
port_(port),
socket_(NULL),
serveEventBase_(NULL),
nWorkers_(nWorkers),
timeout_(0),
eventBaseManager_(),
workerChoice_(0),
maxFrameSize_(T_ASYNC_DEFAULT_MAX_FRAME_SIZE),
readBufferDefaultSize_(T_ASYNC_READ_BUFFER_DEFAULT_SIZE),
writeBufferDefaultSize_(T_ASYNC_WRITE_BUFFER_DEFAULT_SIZE),
idleReadBufferLimit_(T_ASYNC_IDLE_READ_BUFFER_LIMIT),
idleWriteBufferLimit_(T_ASYNC_IDLE_WRITE_BUFFER_LIMIT),
resizeBufferEveryN_(T_ASYNC_RESIZE_BUFFER_EVERY_N),
callTimeout_(0),
taskExpireTime_(0),
queuingMode_(true),
acceptRateAdjustSpeed_(0),
maxNumMsgsInPipe_(T_MAX_NUM_MESSAGES_IN_PIPE),
maxNumActiveConnectionsPerWorker_(0),
transportType_(T_ASYNC_DEFAULT_TRANSPORT_TYPE) {
setDuplexProtocolFactory(duplexProtocolFactory);
setThreadManager(threadManager);
}
virtual ~TEventServer() {
}
/**
*
*/
void setSSLContext(boost::shared_ptr<transport::SSLContext> context) {
sslContext_ = context;
}
boost::shared_ptr<transport::SSLContext> getSSLContext() const {
return sslContext_;
}
/**
* Use the provided socket rather than binding to port_. The caller must
* call ::bind on this socket, but should not call ::listen.
*
* NOTE: TEventServe takes ownership of this 'socket' so if binding fails
* we destroy this socket, while cleaning itself up. So, 'accept' better
* work the first time :)
*/
void useExistingSocket(int socket);
/**
* Return the file descriptor associated with the listening socket
*/
int getListenSocket() const;
/**
* Get the TAsyncProcessorFactory object used by this server.
*
* @return a pointer to the processorFactory.
*/
boost::shared_ptr<TAsyncProcessorFactory> getAsyncProcessorFactory() const {
return asyncProcessorFactory_;
}
/**
* Set the TAsyncProcessor object used by this server.
*/
void setAsyncProcessorFactory(boost::shared_ptr<TAsyncProcessorFactory> pf) {
asyncProcessorFactory_ = pf;
}
/**
* Get the TEventBase used by the current thread.
* This will be different between each worker and the listener. Use this
* for any event monitoring within a processor and be careful NOT to
* cache between connections (since they may be executed by different
* workers).
*
* @return a pointer to the TEventBase.
*/
TEventBase* getEventBase() const {
return eventBaseManager_.getEventBase();
}
/**
* Get the TEventServer's main event base.
*
* @return a pointer to the TEventBase.
*/
TEventBase* getServeEventBase() const {
return serveEventBase_;
}
/**
* Get the TEventBaseManager used by this server.
* This can be used to find or create the TEventBase associated with
* any given thread, including any new threads created by clients.
*
* @return a pointer to the TEventBaseManager.
*/
TEventBaseManager* getEventBaseManager() {
return &eventBaseManager_;
}
const TEventBaseManager* getEventBaseManager() const {
return &eventBaseManager_;
}
/**
* Set the port to serve
*/
void setPort(uint16_t port) {
port_ = port ;
}
/**
*Set the maximum number of inactive connection objects pooled.
* Since these objects consume memory, we need to limit how many we keep.
* You can disable pooling altogether by setting this to zero. Note that
* the actual maximum is nWorkers*size since each worker thread maintains
* its own pool (to avoid the need for locks).
*
* @param size the maximum number of inactive connections to pool.
*/
void setMaxConnectionPoolSize(uint32_t size) {
maxConnectionPoolSize_ = size;
}
/** Get the maximum number of inactive connection objects pooled.
@return the maximum pool size.
*/
uint32_t getMaxConnectionPoolSize() const {
return maxConnectionPoolSize_;
}
/**
* Get the maximum number of unprocessed messages which a NotificationPipe
* can hold.
*/
uint32_t getMaxNumMessagesInPipe() const {
return maxNumMsgsInPipe_;
}
/**
* Set the maximum number of unprocessed messages in NotificationPipe.
* No new message will be sent to that NotificationPipe if there are more
* than such number of unprocessed messages in that pipe.
*/
void setMaxNumMessagesInPipe(uint32_t num) {
maxNumMsgsInPipe_ = num;
}
/**
* Get the maxmum number of active connections each TAsyncWorker can have
*/
int32_t getMaxNumActiveConnectionsPerWorker() const {
return maxNumActiveConnectionsPerWorker_;
}
/**
* Set the maxmum number of active connections each TAsyncWorker can have.
* Zero means unlimited
*/
void setMaxNumActiveConnectionsPerWorker(int32_t num) {
maxNumActiveConnectionsPerWorker_ = num;
}
/**
* Get the speed of adjusting connection accept rate.
*/
double getAcceptRateAdjustSpeed() const {
return acceptRateAdjustSpeed_;
}
/**
* Set the speed of adjusting connection accept rate.
*/
void setAcceptRateAdjustSpeed(double speed) {
acceptRateAdjustSpeed_ = speed;
}
/**
* Get the number of connections dropped by the TAsyncServerSocket
*/
uint64_t getNumDroppedConnections() const;
/** Reset the maximum number of inactive connection objects to the default.
*/
void resetMaxConnectionPoolSize() {
setMaxConnectionPoolSize(T_ASYNC_MAX_CONNECTION_POOL_SIZE);
}
/** Get maximum number of milliseconds we'll wait for data (0 = infinity).
*
* @return number of milliseconds, or 0 if no timeout set.
*/
int getRecvTimeout() const {
return timeout_;
}
/** Set maximum number of milliseconds we'll wait for data (0 = infinity).
* Note: existing connections are unaffected by this call.
*
* @param timeout number of milliseconds, or 0 to disable timeouts.
*/
void setRecvTimeout(int timeout) {
timeout_ = timeout;
}
/** Set the maximum frame size server will accept.
*
* @param size the maximum size in bytes of a frame we'll accept.
*/
void setMaxFrameSize(uint32_t size) {
maxFrameSize_ = size;
}
/** Get the maximum frame size server will accept.
*
* @return the maximum pool size.
*/
uint32_t getMaxFrameSize() const {
return maxFrameSize_;
}
/**
* Get the starting size of a TEventConnection object's read buffer.
*
* @return # bytes we init a TEventConnection object's read buffer to.
*/
size_t getReadBufferDefaultSize() const {
return readBufferDefaultSize_;
}
/**
* Set the starting size of a TEventConnection object's read buffer.
*
* @param size # bytes we init a TEventConnection object's read buffer to.
*/
void setReadBufferDefaultSize(size_t size) {
readBufferDefaultSize_ = size;
}
/**
* Get the starting size of a TEventConnection object's write buffer.
*
* @return # bytes we init a TEventConnection object's write buffer to.
*/
size_t getWriteBufferDefaultSize() const {
return writeBufferDefaultSize_;
}
/**
* Set the starting size of a TEventConnection object's write buffer.
*
* @param size # bytes we init a TEventConnection object's write buffer to.
*/
void setWriteBufferDefaultSize(size_t size) {
writeBufferDefaultSize_ = size;
}
/**
* Get the maximum size of read buffer allocated to idle TConnection objects.
*
* @return # bytes beyond which we will shrink buffers when idle.
*/
size_t getIdleReadBufferLimit() const {
return idleReadBufferLimit_;
}
/**
* Set the maximum size read buffer allocated to idle TEventConnection
* objects. If a TEventConnection object is found (either on connection
* close or between calls when resizeBufferEveryN_ is set) with more than
* this much memory
* allocated to its read buffer, we shrink it to this value.
*
* @param limit of bytes beyond which we will shrink buffers when checked.
*/
void setIdleReadBufferLimit(size_t limit) {
idleReadBufferLimit_ = limit;
}
/**
* Get the maximum size of write buffer allocated to idle TEventConnection
* objects.
*
* @return # bytes beyond which we will reallocate buffers when checked.
*/
size_t getIdleWriteBufferLimit() const {
return idleWriteBufferLimit_;
}
/**
* Set the maximum size write buffer allocated to idle TEventConnection
* objects. If a TEventConnection object is found (either on connection
* close or between calls when resizeBufferEveryN_ is set) with more than
* this much memory allocated to its write buffer, we destroy and construct
* that buffer.
*
* @param limit of bytes beyond which we will shrink buffers when idle.
*/
void setIdleWriteBufferLimit(size_t limit) {
idleWriteBufferLimit_ = limit;
}
/**
* Get # of calls made between buffer size checks. 0 means disabled.
*
* @return # of calls between buffer size checks.
*/
int32_t getResizeBufferEveryN() const {
return resizeBufferEveryN_;
}
/**
* Check buffer sizes every "count" calls. This allows buffer limits
* to be enforced for persistant connections with a controllable degree
* of overhead. 0 disables checks except at connection close.
*
* @param count the number of calls between checks, or 0 to disable
*/
void setResizeBufferEveryN(int32_t count) {
resizeBufferEveryN_ = count;
}
/**
* Set a call timeout in milliseconds.
*
* When a worker's TEventBase starts taking longer than this amount of time
* to process a single loop, start dropping connections to reduce loadj
*
* TODO: This should be renamed something other than "call timeout"
*
* @param milliseconds the call timeout (0 inhibits)
*/
void setCallTimeout(int32_t milliseconds) {
callTimeout_ = milliseconds;
}
/**
* Get the call timeout in milliseconds. 0 (default) disables.
*
* @return the call timeout in milliseconds
*/
int32_t getCallTimeout() const {
return callTimeout_;
}
/**
* Set Thread Manager (for queuing mode).
*
* @param threadManager a shared pointer to the thread manager
*/
void setThreadManager(boost::shared_ptr<concurrency::ThreadManager>
threadManager) {
threadManager_ = threadManager;
}
/**
* Get Thread Manager (for queuing mode).
*
* @return a shared pointer to the thread manager
*/
boost::shared_ptr<concurrency::ThreadManager> getThreadManager() {
return threadManager_;
}
/**
* Get the task expire time (for queuing mode).
*
* @return task expire time
*/
int64_t getTaskExpireTime() const {
return taskExpireTime_;
}
/**
* Return whether we are in queuing mode or not.
*
* @return true if we are in queuing mode, false if not.
*/
bool queuingMode() const {
return queuingMode_;
}
/**
* Set the transport type to use
*
* @param transportType transport type
*/
void setTransportType(TransportType transportType) {
/*********** Deprecation Warning *******************
* *
* The unframed transports are deprecated ! *
* They should be used for legancy services only *
* Also note: they only works with TBinaryProtocol *
***************************************************/
if (transportType == UNFRAMED_BINARY &&
!dynamic_cast<apache::thrift::protocol::TBinaryProtocolFactoryBase*>(
getDuplexProtocolFactory()->getInputProtocolFactory().get())) {
throw TLibraryException(
"UnFramedTransport can only be used with TBinaryProtocol");
} else if (transportType == HEADER &&
!dynamic_cast<apache::thrift::protocol::THeaderProtocolFactory*>(
getDuplexProtocolFactory()->getInputProtocolFactory().get())) {
throw TLibraryException(
"HEADER transport can only be used with THeaderProtocol");
}
transportType_ = transportType;
}
/**
* Get the transport type to use
*
* @return transport type
*/
TransportType getTransportType() {
return transportType_;
}
/**
* Call this to complete initialization
*/
void setup();
/**
* Kill the workers and wait for listeners to quit
*/
void cleanUp();
/**
* One stop solution:
*
* starts worker threads, enters accept loop; when
* the accept loop exits, shuts down and joins workers.
*/
void serve();
/**
* Call this to stop the server, if started by serve()
*
* This causes the main serve() function to stop listening for new
* connections, closes existing connections, shut down the worker threads,
* and then return.
*/
void stop();
/**
* Call this to stop listening on the server port.
*
* This causes the main serve() function to stop listening for new
* connections while still allows the worker threads to process
* existing connections. stop() still needs to be called to clear
* up the worker threads.
*/
void stopListening();
/**
* Terminate a given pending task. Callable by the thread manager or
* from the server context.
*/
void expireClose(
boost::shared_ptr<apache::thrift::concurrency::Runnable> task);
/**
* In task queue mode, drop a task from the head of the queue and shut
* down the associated connection.
*/
bool drainPendingTask();
/**
* Get the TConnectionContext for the connection currently being processed.
*
* This is intended to be invoked from within the TAsyncProcessor (or the
* handler used by the TProcessor).
*
* @return Return a pointer to the TConnectionContext for the current
* connection, or NULL if invoked outside of a call to
* TAsyncProcessor::process(). The returned TConnectionContext
* object is guaranteed to remain valid until the
* TAsyncProcessor invokes its success or error callback. However,
* getConnectionContext() may return NULL when invoked after
* process() has returned.
*
* In other words, async handlers may continue using the
* TConnectionContext object for the duration of the handler
* processing. However, they must retrieve the TConnectionContext
* inside the call to process() and cache it for later use if
* they need it later.
*/
virtual server::TConnectionContext* getConnectionContext() const;
// We use this to get the processor when in task queue mode
using TServer::getProcessor;
};
}}} // apache::thrift::async
#endif // #ifndef THRIFT_ASYNC_TEVENTSERVER_H_
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