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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.
- */
-
-/* $Rev$ $Date$ */
-
-#ifndef tuscany_cache_hpp
-#define tuscany_cache_hpp
-
-/**
- * Simple local cache monad implementation.
- */
-
-#ifdef _REENTRANT
-#include <pthread.h>
-#endif
-#include <sys/stat.h>
-
-#include <string>
-#include "value.hpp"
-#include "monad.hpp"
-
-namespace tuscany {
-
-/**
- * Cached monad. Used to represent a value that can be cached.
- * To get the value in the monad, just cast it to the value type.
- */
-template<typename V> class cached {
-public:
- cached() : mutex(mutex_init()), mtime(0) {
- }
-
- cached(const lambda<V()>& lvalue, const lambda<unsigned long()> ltime) : mutex(mutex_init()), lvalue(lvalue), ltime(ltime), mtime(0) {
- }
-
- cached(const lambda<V()>& lvalue, const lambda<unsigned long()> ltime, const unsigned long mtime, const V& v) : mutex(mutex_init()), lvalue(lvalue), ltime(ltime), mtime(mtime), v(v) {
- }
-
- cached(const cached<V>& c) : mutex(mutex_init()), lvalue(c.lvalue), ltime(c.ltime), mtime(c.mtime), v(c.v) {
- }
-
- ~cached() {
-#ifdef _REENTRANT
- pthread_mutex_destroy(mutex);
-#endif
- }
-
- const cached<V>& operator=(const cached<V>& c) {
- if(this == &c)
- return *this;
-#ifdef _REENTRANT
- pthread_mutex_lock(mutex);
-#endif
- this->lvalue = c.lvalue;
- this->ltime = c.ltime;
- this->mtime = c.mtime;
- this->v = c.v;
-#ifdef _REENTRANT
- pthread_mutex_unlock(mutex);
-#endif
- return *this;
- }
-
- const bool operator!=(const cached<V>& m) const {
- return !this->operator==(m);
- }
-
- const bool operator==(const cached<V>& m) const {
- if (this == &m)
- return true;
-#ifdef _REENTRANT
- pthread_mutex_lock(mutex);
-#endif
- const bool r = mtime == m.mtime && v == m.v;
-#ifdef _REENTRANT
- pthread_mutex_unlock(mutex);
-#endif
- return r;
- }
-
-private:
-#ifdef _REENTRANT
- pthread_mutex_t* mutex;
- pthread_mutex_t* mutex_init() {
- pthread_mutex_t* mx = new pthread_mutex_t();
- pthread_mutex_init(mx, NULL);
- return mx;
- }
-#else
- void* mutex;
- void* mutex_init() {
- return NULL;
- }
-#endif
-
- lambda<V()> lvalue;
- lambda<time_t()> ltime;
- unsigned long mtime;
- V v;
-
- template<typename X> friend const cached<X> latest(const cached<X>& c);
- template<typename X> friend const X content(const cached<X>& c);
- template<typename X> friend std::ostream& operator<<(std::ostream& out, const cached<X>& c);
-};
-
-/**
- * Write a cached monad to a stream.
- */
-template<typename V> std::ostream& operator<<(std::ostream& out, const cached<V>& c) {
- out << c.v;
- return out;
-}
-
-/**
- * Returns the latest value of a cached monad.
- */
-template<typename V> const cached<V> latest(const cached<V>& c) {
- unsigned long nt = c.ltime();
- if (nt == c.mtime)
- return c;
- return cached<V>(c.lvalue, c.ltime, nt, c.lvalue());
-}
-
-/**
- * Returns the content of a cached monad.
- */
-template<typename V> const V content(const cached<V>& c) {
- return c.v;
-}
-
-/**
- * Returns the latest modification time of a file.
- */
-const unsigned long latestFileTime(const std::string& path) {
- struct stat st;
- int rc = stat(path.c_str(), &st);
- if (rc < 0)
- return 0;
- return st.st_mtim.tv_nsec;
-}
-
-}
-
-#endif /* tuscany_cache_hpp */