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-rw-r--r--libadhocutil/resourcePool.cpp28
-rw-r--r--libadhocutil/resourcePool.h126
-rw-r--r--libadhocutil/resourcePool.impl.h238
-rw-r--r--libadhocutil/unittests/Jamfile.jam12
-rw-r--r--libadhocutil/unittests/testResourcePool.cpp242
5 files changed, 646 insertions, 0 deletions
diff --git a/libadhocutil/resourcePool.cpp b/libadhocutil/resourcePool.cpp
new file mode 100644
index 0000000..29e6cb9
--- /dev/null
+++ b/libadhocutil/resourcePool.cpp
@@ -0,0 +1,28 @@
+#include "resourcePool.h"
+#include "buffer.h"
+
+namespace AdHoc {
+ TimeOutOnResourcePool::TimeOutOnResourcePool(const char * const n) :
+ name(n)
+ {
+ }
+
+ std::string
+ TimeOutOnResourcePool::message() const throw()
+ {
+ return stringbf("Timeout getting a resource from pool of %s", name);
+ }
+
+ NoCurrentResource::NoCurrentResource(const std::thread::id & id, const char * const n) :
+ threadId(id),
+ name(n)
+ {
+ }
+
+ std::string
+ NoCurrentResource::message() const throw()
+ {
+ return stringbf("Thread %s has no current resource handle of type %s", threadId, name);
+ }
+}
+
diff --git a/libadhocutil/resourcePool.h b/libadhocutil/resourcePool.h
new file mode 100644
index 0000000..70d9ae2
--- /dev/null
+++ b/libadhocutil/resourcePool.h
@@ -0,0 +1,126 @@
+#ifndef ADHOCUTIL_RESOURCEPOOL_H
+#define ADHOCUTIL_RESOURCEPOOL_H
+
+#include <boost/tuple/tuple.hpp>
+#include <boost/thread/shared_mutex.hpp>
+#include <atomic>
+#include <thread>
+#include <list>
+#include <map>
+#include "semaphore.h"
+#include "exception.h"
+#include "visibility.h"
+
+namespace AdHoc {
+ template <typename Resource>
+ class ResourcePool;
+
+ /// A handle to a resource allocated from a ResourcePool.
+ template <typename Resource>
+ class DLL_PUBLIC ResourceHandle {
+ public:
+ /// Handle to an allocated resource, the pool it belongs to and a count of active references.
+ typedef boost::tuple<Resource *, ResourcePool<Resource> *, std::atomic<unsigned int>> Object;
+
+ /// Create a reference to a new resource.
+ ResourceHandle(Object *);
+ ResourceHandle(const ResourceHandle &);
+ ~ResourceHandle();
+
+ void operator=(const ResourceHandle &);
+ Resource * operator->() const;
+ Resource * get() const;
+
+ unsigned int handleCount() const;
+
+ private:
+ DLL_PRIVATE void incRef() const;
+ DLL_PRIVATE void decRef();
+ Object * resource;
+ };
+
+ /// A fully featured resource pool for sharing and reusing a finite set of
+ /// resources, possibly across multiple threads.
+ template <typename Resource>
+ class DLL_PUBLIC ResourcePool {
+ public:
+ friend class ResourceHandle<Resource>;
+
+ ResourcePool(unsigned int maxSize, unsigned int keep);
+ virtual ~ResourcePool();
+
+ ResourceHandle<Resource> get();
+ ResourceHandle<Resource> get(unsigned int);
+ ResourceHandle<Resource> getMine();
+ void idle();
+
+ unsigned int inUseCount() const;
+ unsigned int availableCount() const;
+
+ protected:
+ virtual Resource * createResource() const = 0;
+ virtual void destroyResource(Resource *) const;
+ virtual void testResource(const Resource *) const;
+
+ private:
+ typedef std::list<Resource *> Available;
+ typedef std::multimap<std::thread::id, typename ResourceHandle<Resource>::Object *> InUse;
+
+ void putBack(Resource *);
+ void discard(Resource *);
+
+ DLL_PRIVATE static void removeFrom(Resource *, InUse &);
+ DLL_PRIVATE ResourceHandle<Resource> getOne();
+
+ mutable boost::upgrade_mutex lock;
+ Semaphore poolSize;
+ unsigned int keep;
+ Available available;
+ InUse inUse;
+ };
+
+ /// Represents a failure to acquire a new resource within the given timeout.
+ class DLL_PUBLIC TimeOutOnResourcePool : public AdHoc::StdException {
+ public:
+ TimeOutOnResourcePool(const char * const type);
+
+ std::string message() const throw() override;
+
+ private:
+ const char * const name;
+ };
+
+ /// Represents a failure to acquire a new resource of type R within the given timeout.
+ template <typename R>
+ class DLL_PUBLIC TimeOutOnResourcePoolT : public TimeOutOnResourcePool {
+ public:
+ TimeOutOnResourcePoolT();
+ };
+
+ /// Represents a request for the current thread's previous allocated resource
+ /// when one has not been allocated.
+ class DLL_PUBLIC NoCurrentResource : public AdHoc::StdException {
+ public:
+ /// Construct for a specific thread and resource type.
+ NoCurrentResource(const std::thread::id &, const char * const type);
+
+ std::string message() const throw() override;
+
+ private:
+ const std::thread::id threadId;
+ const char * const name;
+ };
+
+ /// Represents a request for the current thread's previous allocated resource
+ /// of type R when one has not been allocated.
+ template <typename R>
+ class DLL_PUBLIC NoCurrentResourceT : public NoCurrentResource {
+ public:
+ /// Construct for a specific thread and resource type R.
+ NoCurrentResourceT(const std::thread::id &);
+ };
+
+}
+
+#endif
+
diff --git a/libadhocutil/resourcePool.impl.h b/libadhocutil/resourcePool.impl.h
new file mode 100644
index 0000000..d4fcfe4
--- /dev/null
+++ b/libadhocutil/resourcePool.impl.h
@@ -0,0 +1,238 @@
+#ifndef ADHOCUTIL_RESOURCEPOOL_IMPL_H
+#define ADHOCUTIL_RESOURCEPOOL_IMPL_H
+
+#include "resourcePool.h"
+#include "lockHelpers.h"
+#include "safeMapFind.h"
+
+namespace AdHoc {
+ //
+ // ResourceHandle
+ //
+
+ template <typename R>
+ ResourceHandle<R>::ResourceHandle(Object * o) :
+ resource(o)
+ {
+ incRef();
+ }
+
+ template <typename R>
+ ResourceHandle<R>::ResourceHandle(const ResourceHandle & rh) :
+ resource(rh.resource)
+ {
+ incRef();
+ }
+
+ template <typename R>
+ ResourceHandle<R>::~ResourceHandle()
+ {
+ decRef();
+ }
+
+ template <typename R>
+ unsigned int
+ ResourceHandle<R>::handleCount() const
+ {
+ return boost::get<2>(*resource);
+ }
+
+ template <typename R>
+ R *
+ ResourceHandle<R>::get() const
+ {
+ return boost::get<0>(*resource);
+ }
+
+ template <typename R>
+ R *
+ ResourceHandle<R>::operator->() const
+ {
+ return boost::get<0>(*resource);
+ }
+
+ template <typename R>
+ void
+ ResourceHandle<R>::incRef() const
+ {
+ ++boost::get<2>(*resource);
+ }
+
+ template <typename R>
+ void
+ ResourceHandle<R>::decRef()
+ {
+ if (!--boost::get<2>(*resource)) {
+ if (std::uncaught_exception()) {
+ boost::get<1>(*resource)->discard(boost::get<0>(*resource));
+ }
+ else {
+ boost::get<1>(*resource)->putBack(boost::get<0>(*resource));
+ }
+ delete resource;
+ }
+ resource = nullptr;
+ }
+
+ //
+ // ResourcePool
+ //
+
+ template <typename R>
+ ResourcePool<R>::ResourcePool(unsigned int max, unsigned int k) :
+ poolSize(max),
+ keep(k)
+ {
+ }
+
+ template <typename R>
+ ResourcePool<R>::~ResourcePool()
+ {
+ for (auto & r : available) {
+ destroyResource(r);
+ }
+ for (auto & r : inUse) {
+ destroyResource(boost::get<0>(*r.second));
+ }
+ }
+
+ template <typename R>
+ void
+ ResourcePool<R>::destroyResource(R * r) const
+ {
+ delete r;
+ }
+
+ template <typename R>
+ void
+ ResourcePool<R>::testResource(const R *) const
+ {
+ }
+
+ template <typename R>
+ unsigned int
+ ResourcePool<R>::inUseCount() const
+ {
+ SharedLock(lock);
+ return inUse.size();
+ }
+
+ template <typename R>
+ unsigned int
+ ResourcePool<R>::availableCount() const
+ {
+ SharedLock(lock);
+ return available.size();
+ }
+
+ template <typename R>
+ ResourceHandle<R>
+ ResourcePool<R>::getMine()
+ {
+ Lock(lock);
+ return safeMapLookup<NoCurrentResourceT<R>>(inUse, std::this_thread::get_id());
+ }
+
+ template <typename R>
+ void
+ ResourcePool<R>::idle()
+ {
+ Lock(lock);
+ for (auto & r : available) {
+ destroyResource(r);
+ }
+ available.clear();
+ }
+
+ template <typename R>
+ ResourceHandle<R>
+ ResourcePool<R>::get()
+ {
+ poolSize.wait();
+ return getOne();
+ }
+
+ template <typename R>
+ ResourceHandle<R>
+ ResourcePool<R>::get(unsigned int timeout)
+ {
+ if (!poolSize.wait(timeout)) {
+ throw TimeOutOnResourcePoolT<R>();
+ }
+ return getOne();
+ }
+
+ template <typename R>
+ ResourceHandle<R>
+ ResourcePool<R>::getOne()
+ {
+ UpgradableLock(lock, ulock);
+ if (available.empty()) {
+ auto ro = new typename ResourceHandle<R>::Object(createResource(), this);
+ UpgradeLock(ulock);
+ inUse.insert({ std::this_thread::get_id(), ro });
+ return ro;
+ }
+ else {
+ UpgradeLock(ulock);
+ auto ro = new typename ResourceHandle<R>::Object(available.front(), this);
+ available.pop_front();
+ inUse.insert({ std::this_thread::get_id(), ro });
+ return ro;
+ }
+ }
+
+ template <typename R>
+ void
+ ResourcePool<R>::putBack(R * r)
+ {
+ Lock(lock);
+ removeFrom(r, inUse);
+ if (available.size() < keep) {
+ available.push_back(r);
+ }
+ else {
+ destroyResource(r);
+ }
+ poolSize.notify();
+ }
+
+ template <typename R>
+ void
+ ResourcePool<R>::discard(R * r)
+ {
+ Lock(lock);
+ removeFrom(r, inUse);
+ destroyResource(r);
+ poolSize.notify();
+ }
+
+ template <typename R>
+ void
+ ResourcePool<R>::removeFrom(R * r, InUse & inUse)
+ {
+ auto rs = inUse.equal_range(std::this_thread::get_id());
+ for (auto & ri = rs.first; ri != rs.second; ri++) {
+ if (boost::get<0>(*ri->second) == r) {
+ inUse.erase(ri);
+ return;
+ }
+ }
+ }
+
+ template <typename R>
+ TimeOutOnResourcePoolT<R>::TimeOutOnResourcePoolT() :
+ TimeOutOnResourcePool(typeid(R).name())
+ {
+ }
+
+ template <typename R>
+ NoCurrentResourceT<R>::NoCurrentResourceT(const std::thread::id & id) :
+ NoCurrentResource(id, typeid(R).name())
+ {
+ }
+
+}
+
+#endif
+
diff --git a/libadhocutil/unittests/Jamfile.jam b/libadhocutil/unittests/Jamfile.jam
index 334b47e..582b174 100644
--- a/libadhocutil/unittests/Jamfile.jam
+++ b/libadhocutil/unittests/Jamfile.jam
@@ -185,3 +185,15 @@ run
testException
;
+run
+ testResourcePool.cpp
+ : : :
+ <define>BOOST_TEST_DYN_LINK
+ <library>..//adhocutil
+ <library>boost_utf
+ <library>boost_thread
+ <library>boost_system
+ :
+ testResourcePool
+ ;
+
diff --git a/libadhocutil/unittests/testResourcePool.cpp b/libadhocutil/unittests/testResourcePool.cpp
new file mode 100644
index 0000000..8b4161e
--- /dev/null
+++ b/libadhocutil/unittests/testResourcePool.cpp
@@ -0,0 +1,242 @@
+#define BOOST_TEST_MODULE ResourcePool
+#include <boost/test/unit_test.hpp>
+
+#include <resourcePool.impl.h>
+
+class MockResource {
+ public:
+ MockResource() { count += 1; }
+ ~MockResource() { count -= 1; }
+
+ MockResource(const MockResource &) = delete;
+ void operator=(const MockResource &) = delete;
+
+ static std::atomic<unsigned int> count;
+};
+
+std::atomic<unsigned int> MockResource::count;
+
+class TRP : public AdHoc::ResourcePool<MockResource> {
+ public:
+ TRP() : AdHoc::ResourcePool<MockResource>(10, 10) { }
+ protected:
+ MockResource * createResource() const override
+ {
+ return new MockResource();
+ }
+};
+
+class TRPSmall : public AdHoc::ResourcePool<MockResource> {
+ public:
+ TRPSmall() : AdHoc::ResourcePool<MockResource>(3, 1) { }
+ protected:
+ MockResource * createResource() const override
+ {
+ return new MockResource();
+ }
+};
+
+BOOST_AUTO_TEST_CASE ( get )
+{
+ {
+ TRP pool;
+ BOOST_REQUIRE_EQUAL(0, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+
+ {
+ auto r1 = pool.get();
+ BOOST_REQUIRE_EQUAL(1, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(1, r1.handleCount());
+ BOOST_REQUIRE_EQUAL(1, MockResource::count);
+ BOOST_REQUIRE(r1.get());
+
+ auto r2(pool.get());
+ BOOST_REQUIRE_EQUAL(2, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(1, r2.handleCount());
+ BOOST_REQUIRE_EQUAL(2, MockResource::count);
+ BOOST_REQUIRE(r2.get());
+
+ auto r1a = r1;
+ BOOST_REQUIRE_EQUAL(2, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(2, r1.handleCount());
+ BOOST_REQUIRE_EQUAL(2, r1a.handleCount());
+ BOOST_REQUIRE_EQUAL(2, MockResource::count);
+ BOOST_REQUIRE(r1.get());
+ BOOST_REQUIRE(r1a.get());
+ BOOST_REQUIRE_EQUAL(r1.get(), r1a.get());
+ }
+
+ BOOST_REQUIRE_EQUAL(0, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(2, pool.availableCount());
+ }
+ BOOST_REQUIRE_EQUAL(0, MockResource::count);
+}
+
+BOOST_AUTO_TEST_CASE ( getMine )
+{
+ TRP pool;
+ auto r1 = pool.get();
+ BOOST_REQUIRE(r1.get());
+ auto r2 = pool.getMine();
+ BOOST_REQUIRE_EQUAL(r1.get(), r2.get());
+ BOOST_REQUIRE_EQUAL(2, r1.handleCount());
+ BOOST_REQUIRE_EQUAL(2, r2.handleCount());
+}
+
+BOOST_AUTO_TEST_CASE( getMineNoCurrent )
+{
+ TRP pool;
+ BOOST_REQUIRE_THROW(pool.getMine(), AdHoc::NoCurrentResourceT<MockResource>);
+ {
+ auto r1 = pool.get();
+ auto r2 = pool.getMine();
+ BOOST_REQUIRE_EQUAL(r1.get(), r2.get());
+ }
+ BOOST_REQUIRE_THROW(pool.getMine(), AdHoc::NoCurrentResource);
+}
+
+BOOST_AUTO_TEST_CASE( discard )
+{
+ TRP pool;
+ try {
+ auto r1 = pool.get();
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(1, pool.inUseCount());
+ throw std::exception();
+ }
+ catch (...) {
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(0, pool.inUseCount());
+ }
+}
+
+BOOST_AUTO_TEST_CASE( keepSome1 )
+{
+ TRPSmall pool;
+ {
+ auto r1 = pool.get();
+ {
+ auto r2 = pool.get();
+ {
+ auto r3 = pool.get();
+ BOOST_REQUIRE_EQUAL(3, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(3, MockResource::count);
+ }
+ BOOST_REQUIRE_EQUAL(2, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(1, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(3, MockResource::count);
+ }
+ BOOST_REQUIRE_EQUAL(1, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(1, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(2, MockResource::count);
+ {
+ auto r2 = pool.get();
+ BOOST_REQUIRE_EQUAL(2, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(2, MockResource::count);
+ }
+ BOOST_REQUIRE_EQUAL(1, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(1, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(2, MockResource::count);
+ }
+ BOOST_REQUIRE_EQUAL(0, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(1, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(1, MockResource::count);
+}
+
+BOOST_AUTO_TEST_CASE( keepSome2 )
+{
+ TRPSmall pool;
+ {
+ auto r1 = pool.get();
+ auto r2 = pool.get();
+ auto r3 = pool.get();
+ BOOST_REQUIRE_EQUAL(3, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(3, MockResource::count);
+ }
+ BOOST_REQUIRE_EQUAL(0, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(1, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(1, MockResource::count);
+}
+
+BOOST_AUTO_TEST_CASE( idle )
+{
+ TRP pool;
+ {
+ {
+ auto r1 = pool.get();
+ auto r2 = pool.get();
+ }
+ auto r3 = pool.get();
+ BOOST_REQUIRE_EQUAL(1, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(1, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(2, MockResource::count);
+ pool.idle();
+ BOOST_REQUIRE_EQUAL(1, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(1, MockResource::count);
+ }
+ BOOST_REQUIRE_EQUAL(0, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(1, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(1, MockResource::count);
+ pool.idle();
+ BOOST_REQUIRE_EQUAL(0, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(0, pool.availableCount());
+ BOOST_REQUIRE_EQUAL(0, MockResource::count);
+}
+
+BOOST_AUTO_TEST_CASE( threading1 )
+{
+ TRPSmall pool;
+ std::list<std::thread *> threads;
+ for (int x = 0; x < 100; x += 1) {
+ threads.push_back(new std::thread([&pool](){
+ auto r = pool.get();
+ usleep(50000);
+ }));
+ usleep(5000);
+ // pool size never exceeds 3
+ BOOST_REQUIRE(pool.inUseCount() <= 3);
+ }
+ for(std::thread * thread : threads) {
+ thread->join();
+ delete thread;
+ }
+ // pool keep returns to 1
+ BOOST_REQUIRE_EQUAL(1, pool.availableCount());
+}
+
+static
+void
+acquireAndKeepFor1Second(TRPSmall * pool)
+{
+ auto r = pool->get();
+ sleep(1);
+}
+
+BOOST_AUTO_TEST_CASE( threading2 )
+{
+ TRPSmall pool;
+ std::thread t1([&pool]() { acquireAndKeepFor1Second(&pool); });
+ std::thread t2([&pool]() { acquireAndKeepFor1Second(&pool); });
+ std::thread t3([&pool]() { acquireAndKeepFor1Second(&pool); });
+
+ BOOST_REQUIRE_THROW(pool.get(100), AdHoc::TimeOutOnResourcePoolT<MockResource>);
+ BOOST_REQUIRE_EQUAL(3, pool.inUseCount());
+
+ t1.join();
+ {
+ auto r = pool.get(0);
+ t2.join();
+ t3.join();
+ }
+
+ BOOST_REQUIRE_EQUAL(0, pool.inUseCount());
+ BOOST_REQUIRE_EQUAL(1, pool.availableCount());
+}
+
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