Import of qpid from etp:

  URL: https://etp.108.redhat.com/svn/etp/trunk/blaze
  Repository Root: https://etp.108.redhat.com/svn/etp
  Repository UUID: 06e15bec-b515-0410-bef0-cc27a458cf48
  Revision: 608



git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@447994 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 191 insertions, 0 deletions

diff --git a/cpp/common/io/src/LFProcessor.cpp b/cpp/common/io/src/LFProcessor.cpp
new file mode 100644
index 0000000000..8ef3543b8f
--- /dev/null
+++ b/cpp/common/io/src/LFProcessor.cpp
@@ -0,0 +1,191 @@
+/*
+ *
+ * Copyright (c) 2006 The Apache Software Foundation
+ *
+ * Licensed 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.
+ *
+ */
+#include "LFProcessor.h"
+#include "APRBase.h"
+#include "LFSessionContext.h"
+#include "QpidError.h"
+#include <sstream>
+
+using namespace qpid::io;
+using namespace qpid::concurrent;
+using qpid::QpidError;
+
+LFProcessor::LFProcessor(apr_pool_t* pool, int _workers, int _size, int _timeout) : size(_size), 
+                                                                                    timeout(_timeout), 
+                                                                                    signalledCount(0),
+                                                                                    current(0),
+                                                                                    count(0),
+                                                                                    hasLeader(false),
+                                                                                    workerCount(_workers),
+                                                                                    workers(new Thread*[_workers]),
+                                                                                    stopped(false){
+
+    CHECK_APR_SUCCESS(apr_pollset_create(&pollset, size, pool, APR_POLLSET_THREADSAFE));
+    //create & start the required number of threads
+    for(int i = 0; i < workerCount; i++){
+        workers[i] = factory.create(this);
+    }
+}
+
+
+LFProcessor::~LFProcessor(){
+    for(int i = 0; i < workerCount; i++){
+        delete workers[i];
+    }
+    delete[] workers;
+    CHECK_APR_SUCCESS(apr_pollset_destroy(pollset));
+}
+
+void LFProcessor::start(){
+    for(int i = 0; i < workerCount; i++){
+        workers[i]->start();
+    }
+}
+
+void LFProcessor::add(const apr_pollfd_t* const fd){
+    CHECK_APR_SUCCESS(apr_pollset_add(pollset, fd));
+    countLock.acquire();
+    sessions.push_back(reinterpret_cast<LFSessionContext*>(fd->client_data));
+    count++;
+    countLock.release();
+}
+
+void LFProcessor::remove(const apr_pollfd_t* const fd){
+    CHECK_APR_SUCCESS(apr_pollset_remove(pollset, fd));
+    countLock.acquire();
+    sessions.erase(find(sessions.begin(), sessions.end(), reinterpret_cast<LFSessionContext*>(fd->client_data)));
+    count--;
+    countLock.release();
+}
+
+void LFProcessor::reactivate(const apr_pollfd_t* const fd){
+    CHECK_APR_SUCCESS(apr_pollset_add(pollset, fd));
+}
+
+void LFProcessor::deactivate(const apr_pollfd_t* const fd){
+    CHECK_APR_SUCCESS(apr_pollset_remove(pollset, fd));
+}
+
+void LFProcessor::update(const apr_pollfd_t* const fd){
+    CHECK_APR_SUCCESS(apr_pollset_remove(pollset, fd));
+    CHECK_APR_SUCCESS(apr_pollset_add(pollset, fd));
+}
+
+bool LFProcessor::full(){
+    countLock.acquire();
+    bool full = count == size; 
+    countLock.release();
+    return full;
+}
+
+bool LFProcessor::empty(){
+    countLock.acquire();
+    bool empty = count == 0; 
+    countLock.release();
+    return empty;
+}
+
+void LFProcessor::poll(){
+    apr_status_t status;
+    do{
+        current = 0;
+        if(!stopped){
+            status = apr_pollset_poll(pollset, timeout, &signalledCount, &signalledFDs);
+        }
+    }while(status != APR_SUCCESS && !stopped);
+}
+
+void LFProcessor::run(){
+    try{
+        while(!stopped){
+            leadLock.acquire();
+            waitToLead();
+            if(!stopped){
+                const apr_pollfd_t* evt = getNextEvent();
+                if(evt){
+                    LFSessionContext* session = reinterpret_cast<LFSessionContext*>(evt->client_data);
+                    session->startProcessing();
+
+                    relinquishLead();
+                    leadLock.release();
+
+                    //process event:
+                    if(evt->rtnevents & APR_POLLIN) session->read();
+                    if(evt->rtnevents & APR_POLLOUT) session->write();
+
+                    if(session->isClosed()){
+                        session->handleClose();
+                        countLock.acquire();
+                        sessions.erase(find(sessions.begin(), sessions.end(), session));
+                        count--;
+                        countLock.release();                        
+                    }else{
+                        session->stopProcessing();
+                    }
+
+                }else{
+                    leadLock.release();
+                }
+            }else{
+                leadLock.release();
+            }
+        }
+    }catch(QpidError error){
+	std::cout << "Error [" << error.code << "] " << error.msg << " (" << error.file << ":" << error.line << ")" << std::endl;
+    }
+}
+
+void LFProcessor::waitToLead(){
+    while(hasLeader && !stopped) leadLock.wait();
+    hasLeader = !stopped;
+}
+
+void LFProcessor::relinquishLead(){
+    hasLeader = false;
+    leadLock.notify();
+}
+
+const apr_pollfd_t* LFProcessor::getNextEvent(){
+    while(true){
+        if(stopped){
+            return 0;
+        }else if(current < signalledCount){
+            //use result of previous poll if one is available
+            return signalledFDs + (current++);
+        }else{
+            //else poll to get new events
+            poll();
+        }
+    }
+}
+
+void LFProcessor::stop(){
+    stopped = true;
+    leadLock.acquire();
+    leadLock.notifyAll();
+    leadLock.release();
+
+    for(int i = 0; i < workerCount; i++){
+        workers[i]->join();
+    }
+
+    for(iterator i = sessions.begin(); i < sessions.end(); i++){
+        (*i)->shutdown();
+    }
+}
+