Handle sigterm signal

Change-Id: If6f431bfdc42f8d53497078b18813147cad1bad0
Issue-ID: DCAEGEN2-1065
Signed-off-by: Piotr Jaszczyk <piotr.jaszczyk@nokia.com>

3 files changed, 52 insertions, 2 deletions

diff --git a/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/logging/reactive_logging.kt b/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/logging/reactive_logging.kt
index e7aca55d..99ecfd74 100644
--- a/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/logging/reactive_logging.kt
+++ b/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/logging/reactive_logging.kt
@@ -71,4 +71,4 @@ fun <T> Flux<T>.filterFailedWithLog(logger: Logger,
                 logger.trace(context, it)
                 Mono.just<T>(t)
             })
-        }
\ No newline at end of file
+        }
diff --git a/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/server_handle.kt b/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/server_handle.kt
index bdb63b68..b8784c64 100644
--- a/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/server_handle.kt
+++ b/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/server_handle.kt
@@ -20,7 +20,9 @@
 package org.onap.dcae.collectors.veshv.utils
 
 import arrow.effects.IO
+import org.onap.dcae.collectors.veshv.utils.logging.Logger
 import reactor.netty.DisposableServer
+import java.time.Duration
 
 /**
  * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
@@ -37,10 +39,17 @@ abstract class ServerHandle(val host: String, val port: Int) {
  */
 class NettyServerHandle(private val ctx: DisposableServer) : ServerHandle(ctx.host(), ctx.port()) {
     override fun shutdown() = IO {
-        ctx.disposeNow()
+        logger.info { "Graceful shutdown" }
+        ctx.disposeNow(SHUTDOWN_TIMEOUT)
+        logger.info { "Server disposed" }
     }
 
     override fun await() = IO<Unit> {
         ctx.channel().closeFuture().sync()
     }
+
+    companion object {
+        val logger = Logger(NettyServerHandle::class)
+        private val SHUTDOWN_TIMEOUT = Duration.ofSeconds(10)
+    }
 }
diff --git a/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/shutdown_hook.kt b/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/shutdown_hook.kt
new file mode 100644
index 00000000..2678a8d5
--- /dev/null
+++ b/sources/hv-collector-utils/src/main/kotlin/org/onap/dcae/collectors/veshv/utils/shutdown_hook.kt
@@ -0,0 +1,41 @@
+/*
+ * ============LICENSE_START=======================================================
+ * dcaegen2-collectors-veshv
+ * ================================================================================
+ * Copyright (C) 2019 NOKIA
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.dcae.collectors.veshv.utils
+
+import arrow.effects.IO
+
+/**
+ * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
+ * @since January 2019
+ */
+
+fun registerShutdownHook(job: () -> Unit) {
+    Runtime.getRuntime().addShutdownHook(object : Thread() {
+        override fun run() {
+            job()
+        }
+    })
+}
+
+fun registerShutdownHook(job: IO<Unit>) = IO {
+    registerShutdownHook {
+        job.unsafeRunSync()
+    }
+}