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authorJan Srnicek <jsrnicek@cisco.com>2017-08-10 12:05:41 +0200
committerMarek Gradzki <mgradzki@cisco.com>2017-08-14 07:01:06 +0000
commitd0688f2883b3231e743dcd53bbf2203ec4639c6e (patch)
tree1997647b5f6a3f8531c86bd2aa2196f993f662b7 /infra/impl
parentc9196e020a935593ba4ee48b37228e7e731dfaca (diff)
HONEYCOMB-381 - Shutdown handler
Change-Id: I5cf4317e5838470d1e792090c67d97db76ed14f2 Signed-off-by: Jan Srnicek <jsrnicek@cisco.com>
Diffstat (limited to 'infra/impl')
-rw-r--r--infra/impl/src/main/java/io/fd/honeycomb/impl/ShutdownHandlerImpl.java73
1 files changed, 73 insertions, 0 deletions
diff --git a/infra/impl/src/main/java/io/fd/honeycomb/impl/ShutdownHandlerImpl.java b/infra/impl/src/main/java/io/fd/honeycomb/impl/ShutdownHandlerImpl.java
new file mode 100644
index 0000000..c7cdb21
--- /dev/null
+++ b/infra/impl/src/main/java/io/fd/honeycomb/impl/ShutdownHandlerImpl.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ *
+ * 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.
+ */
+
+package io.fd.honeycomb.impl;
+
+import static java.lang.String.format;
+
+import io.fd.honeycomb.data.init.ShutdownHandler;
+import java.util.Deque;
+import java.util.LinkedList;
+import javax.annotation.Nonnull;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class ShutdownHandlerImpl implements ShutdownHandler {
+
+ private static final Logger LOG = LoggerFactory.getLogger(ShutdownHandlerImpl.class);
+
+ private final Deque<CloseableComponent> components;
+
+ public ShutdownHandlerImpl() {
+ components = new LinkedList<>();
+ Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+ // close components in reverse order that they were registered
+ components.descendingIterator().forEachRemaining(closeable -> {
+ LOG.info("Closing component {}", closeable.getName());
+ try {
+ closeable.getComponent().close();
+ } catch (Exception e) {
+ throw new IllegalStateException(format("Unable to close component %s", closeable.getName()), e);
+ }
+ });
+ }));
+ }
+
+ @Override
+ public synchronized void register(@Nonnull final String name, @Nonnull final AutoCloseable component) {
+ LOG.debug("Registering component {} for proper shutdown", name);
+ components.add(new CloseableComponent(name, component));
+ LOG.trace("Component {} properly register", name);
+ }
+
+ private static final class CloseableComponent {
+ private final String name;
+ private final AutoCloseable component;
+
+ private CloseableComponent(final String name, final AutoCloseable component) {
+ this.name = name;
+ this.component = component;
+ }
+
+ private String getName() {
+ return name;
+ }
+
+ private AutoCloseable getComponent() {
+ return component;
+ }
+ }
+}