1 files changed, 129 insertions, 0 deletions
diff --git a/libs/common_time/cc_helper.cpp b/libs/common_time/cc_helper.cpp
new file mode 100644
index 0000000..8d8556c
--- /dev/null
+++ b/libs/common_time/cc_helper.cpp
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * 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 <stdint.h>
+
+#include <common_time/cc_helper.h>
+#include <common_time/ICommonClock.h>
+#include <utils/threads.h>
+
+namespace android {
+
+Mutex CCHelper::lock_;
+sp<ICommonClock> CCHelper::common_clock_;
+sp<ICommonClockListener> CCHelper::common_clock_listener_;
+uint32_t CCHelper::ref_count_ = 0;
+
+bool CCHelper::verifyClock_l() {
+    bool ret = false;
+
+    if (common_clock_ == NULL) {
+        common_clock_ = ICommonClock::getInstance();
+        if (common_clock_ == NULL)
+            goto bailout;
+    }
+
+    if (ref_count_ > 0) {
+        if (common_clock_listener_ == NULL) {
+            common_clock_listener_ = new CommonClockListener();
+            if (common_clock_listener_ == NULL)
+                goto bailout;
+
+            if (OK != common_clock_->registerListener(common_clock_listener_))
+                goto bailout;
+        }
+    }
+
+    ret = true;
+
+bailout:
+    if (!ret) {
+        common_clock_listener_ = NULL;
+        common_clock_ = NULL;
+    }
+    return ret;
+}
+
+CCHelper::CCHelper() {
+    Mutex::Autolock lock(&lock_);
+    ref_count_++;
+    verifyClock_l();
+}
+
+CCHelper::~CCHelper() {
+    Mutex::Autolock lock(&lock_);
+
+    assert(ref_count_ > 0);
+    ref_count_--;
+
+    // If we were the last CCHelper instance in the system, and we had
+    // previously register a listener, unregister it now so that the common time
+    // service has the chance to go into auto-disabled mode.
+    if (!ref_count_ &&
+       (common_clock_ != NULL) &&
+       (common_clock_listener_ != NULL)) {
+        common_clock_->unregisterListener(common_clock_listener_);
+        common_clock_listener_ = NULL;
+    }
+}
+
+void CCHelper::CommonClockListener::onTimelineChanged(uint64_t timelineID) {
+    // do nothing; listener is only really used as a token so the server can
+    // find out when clients die.
+}
+
+// Helper methods which attempts to make calls to the common time binder
+// service.  If the first attempt fails with DEAD_OBJECT, the helpers will
+// attempt to make a connection to the service again (assuming that the process
+// hosting the service had crashed and the client proxy we are holding is dead)
+// If the second attempt fails, or no connection can be made, the we let the
+// error propagate up the stack and let the caller deal with the situation as
+// best they can.
+#define CCHELPER_METHOD(decl, call)                 \
+    status_t CCHelper::decl {                       \
+        Mutex::Autolock lock(&lock_);               \
+                                                    \
+        if (!verifyClock_l())                       \
+            return DEAD_OBJECT;                     \
+                                                    \
+        status_t status = common_clock_->call;      \
+        if (DEAD_OBJECT == status) {                \
+            if (!verifyClock_l())                   \
+                return DEAD_OBJECT;                 \
+            status = common_clock_->call;           \
+        }                                           \
+                                                    \
+        return status;                              \
+    }
+
+#define VERIFY_CLOCK()
+
+CCHELPER_METHOD(isCommonTimeValid(bool* valid, uint32_t* timelineID),
+                isCommonTimeValid(valid, timelineID))
+CCHELPER_METHOD(commonTimeToLocalTime(int64_t commonTime, int64_t* localTime),
+                commonTimeToLocalTime(commonTime, localTime))
+CCHELPER_METHOD(localTimeToCommonTime(int64_t localTime, int64_t* commonTime),
+                localTimeToCommonTime(localTime, commonTime))
+CCHELPER_METHOD(getCommonTime(int64_t* commonTime),
+                getCommonTime(commonTime))
+CCHELPER_METHOD(getCommonFreq(uint64_t* freq),
+                getCommonFreq(freq))
+CCHELPER_METHOD(getLocalTime(int64_t* localTime),
+                getLocalTime(localTime))
+CCHELPER_METHOD(getLocalFreq(uint64_t* freq),
+                getLocalFreq(freq))
+
+}  // namespace android