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jinglun pushed a commit to branch HADOOP-19236-original
in repository https://gitbox.apache.org/repos/asf/hadoop.git
commit 0c5bb1f7b46f0e5ad1927c3ffa3bfb331d6b925b
Author: lijinglun <lijing...@bytedance.com>
AuthorDate: Wed Aug 21 17:49:02 2024 +0800
Integration of TOS: Add common Chain.
---
.../org/apache/hadoop/fs/tosfs/common/Chain.java | 148 +++++++++++++++++++++
1 file changed, 148 insertions(+)
diff --git
a/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/Chain.java
b/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/Chain.java
new file mode 100644
index 00000000000..1d716a4506a
--- /dev/null
+++
b/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/Chain.java
@@ -0,0 +1,148 @@
+/*
+ * 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.
+ */
+
+package org.apache.hadoop.fs.tosfs.common;
+
+import org.apache.hadoop.fs.tosfs.util.CommonUtils;
+import org.apache.hadoop.thirdparty.com.google.common.collect.Queues;
+import org.apache.hadoop.util.Lists;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.Deque;
+import java.util.List;
+import java.util.Queue;
+import java.util.function.Predicate;
+
+public class Chain<T extends Closeable> implements Closeable {
+ private static final Logger LOG = LoggerFactory.getLogger(Chain.class);
+
+ private final List<IOException> suppressed = Lists.newArrayList();
+ private final Queue<ItemFactory<T>> queue;
+ private final Predicate<IOException> shouldContinue;
+ private T curItem;
+
+ private Chain(Deque<ItemFactory<T>> queue, Predicate<IOException>
shouldContinue) {
+ this.queue = queue;
+ this.shouldContinue = shouldContinue;
+ this.curItem = null;
+ }
+
+ public <R> R run(Task<T, R> task) throws IOException {
+ while (true) {
+ if (curItem == null && !nextItem()) {
+ IOException ex = new IOException("Failed to run task after attempt all
items");
+ suppressed.forEach(ex::addSuppressed);
+ throw ex;
+ }
+
+ try {
+ return task.run(curItem);
+ } catch (IOException e) {
+ LOG.debug("Encounter exception while running task with item {}",
curItem, e);
+ // Resetting the current caller to be null, for triggering the next
round election.
+ if (curItem != null) {
+ CommonUtils.runQuietly(curItem::close);
+ curItem = null;
+ }
+ suppressed.add(e);
+
+ if (shouldContinue != null && !shouldContinue.test(e)) {
+ IOException ex = new IOException("Failed to run the chain since the
encountered error not retryable.");
+ suppressed.forEach(ex::addSuppressed);
+ throw ex;
+ }
+ }
+ }
+ }
+
+ public T curItem() {
+ return curItem;
+ }
+
+ private boolean nextItem() {
+ if (curItem != null) {
+ CommonUtils.runQuietly(curItem::close);
+ curItem = null;
+ }
+
+ while (!queue.isEmpty()) {
+ ItemFactory<T> nextFactory = queue.poll();
+ try {
+ curItem = nextFactory.newItem();
+ return true;
+ } catch (IOException e) {
+ curItem = null;
+ LOG.debug("Failed to create new item", e);
+ suppressed.add(e);
+ }
+ }
+
+ return false;
+ }
+
+ @Override
+ public void close() throws IOException {
+ if (curItem != null) {
+ curItem.close();
+ }
+ }
+
+ public interface ItemFactory<T extends Closeable> {
+ T newItem() throws IOException;
+ }
+
+ public interface Task<T extends Closeable, R> {
+ R run(T call) throws IOException;
+ }
+
+ public static class Builder<T extends Closeable> {
+ private final Deque<ItemFactory<T>> factories = Queues.newArrayDeque();
+ private Predicate<IOException> shouldContinue;
+
+ public Builder<T> addFirst(ItemFactory<T> factory) {
+ factories.addFirst(factory);
+ return this;
+ }
+
+ public Builder<T> addLast(ItemFactory<T> factory) {
+ factories.addLast(factory);
+ return this;
+ }
+
+ public Builder<T> shouldContinue(Predicate<IOException> shouldContinue) {
+ this.shouldContinue = shouldContinue;
+ return this;
+ }
+
+ public Chain<T> build() throws IOException {
+ Chain<T> chain = new Chain<>(factories, shouldContinue);
+
+ // Do nothing in the chain task to initialize the first item.
+ chain.run(item -> null);
+ return chain;
+ }
+ }
+
+ public static <T extends Closeable> Builder<T> builder() {
+ return new Builder<>();
+ }
+}
+
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