1 files changed, 105 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/cluster/Quorum_cman.cpp b/qpid/cpp/src/qpid/cluster/Quorum_cman.cpp
new file mode 100644
index 0000000000..728f824b16
--- /dev/null
+++ b/qpid/cpp/src/qpid/cluster/Quorum_cman.cpp
@@ -0,0 +1,105 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+#include "qpid/cluster/Quorum_cman.h"
+#include "qpid/cluster/Cluster.h"
+#include "qpid/log/Statement.h"
+#include "qpid/Options.h"
+#include "qpid/sys/Time.h"
+#include "qpid/sys/posix/PrivatePosix.h"
+
+namespace qpid {
+namespace cluster {
+
+namespace {
+
+boost::function<void()> errorFn;
+
+void cmanCallbackFn(cman_handle_t handle, void */*privdata*/, int reason, int /*arg*/) {
+    if (reason == CMAN_REASON_STATECHANGE && !cman_is_quorate(handle)) {
+        QPID_LOG(critical, "Lost contact with cluster quorum.");
+        if (errorFn) errorFn();
+        cman_stop_notification(handle);
+    }
+}
+}
+
+Quorum::Quorum(boost::function<void()> err) : cman(0), cmanFd(0) {
+    errorFn = err;
+}
+
+Quorum::~Quorum() {
+    if (dispatchHandle.get()) dispatchHandle->stopWatch();
+    dispatchHandle.reset();
+    if (cman) cman_finish(cman);
+}
+
+void Quorum::start(boost::shared_ptr<sys::Poller> p) {
+    poller = p;
+    QPID_LOG(debug, "Connecting to quorum service.");
+    cman = cman_init(0);
+    if (cman == 0) throw ErrnoException("Can't connect to cman service");
+    if (!cman_is_quorate(cman)) {
+        QPID_LOG(notice, "Waiting for cluster quorum.");
+        while(!cman_is_quorate(cman)) sys::sleep(5);
+    }
+    int err = cman_start_notification(cman, cmanCallbackFn);
+    if (err != 0) throw ErrnoException("Can't register for cman notifications");
+    watch(getFd());
+}
+
+void Quorum::watch(int fd) {
+    cmanFd = fd;
+    if (dispatchHandle.get()) dispatchHandle->stopWatch();
+    ioHandle.reset(new sys::PosixIOHandle(cmanFd));
+    dispatchHandle.reset(
+        new sys::DispatchHandleRef(
+            *ioHandle,      // This must outlive the dispatchHandleRef
+            boost::bind(&Quorum::dispatch, this, _1), // read
+            0, // write
+            boost::bind(&Quorum::disconnect, this, _1)  // disconnect
+        ));
+    dispatchHandle->startWatch(poller);
+}
+
+int Quorum::getFd() {
+    int fd = cman_get_fd(cman);
+    if (fd == 0) throw ErrnoException("Can't get cman file descriptor");
+    return fd;
+}
+
+void Quorum::dispatch(sys::DispatchHandle&) {
+    try {
+        cman_dispatch(cman, CMAN_DISPATCH_ALL);
+        int fd = getFd();
+        if (fd != cmanFd) watch(fd);
+    } catch (const std::exception& e) {
+        QPID_LOG(critical, "Error in quorum dispatch: " << e.what());
+        errorFn();
+    }
+}
+
+void Quorum::disconnect(sys::DispatchHandle&) {
+    QPID_LOG(critical, "Disconnected from quorum service");
+    errorFn();
+}
+
+}} // namespace qpid::cluster