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jinglun pushed a commit to branch HADOOP-19236-original
in repository https://gitbox.apache.org/repos/asf/hadoop.git
commit 5bfc041cca92f358fa4e892577a2b22834d18c9b
Author: lijinglun <lijing...@bytedance.com>
AuthorDate: Mon Aug 12 19:38:14 2024 +0800
Integration of TOS: Add lazy reload interface to common.
---
.../apache/hadoop/fs/tosfs/common/LazyReload.java | 35 +++++++++++
.../hadoop/fs/tosfs/common/LazyReloadIter.java | 70 ++++++++++++++++++++++
.../org/apache/hadoop/fs/tosfs/common/Reload.java | 29 +++++++++
3 files changed, 134 insertions(+)
diff --git
a/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/LazyReload.java
b/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/LazyReload.java
new file mode 100644
index 00000000000..8f673e57480
--- /dev/null
+++
b/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/LazyReload.java
@@ -0,0 +1,35 @@
+/*
+ * 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 java.util.Iterator;
+import java.util.function.Supplier;
+
+public class LazyReload<T> implements Iterable<T> {
+ private final Supplier<Reload<T>> reload;
+
+ public LazyReload(Supplier<Reload<T>> reload) {
+ this.reload = reload;
+ }
+
+ @Override
+ public Iterator<T> iterator() {
+ return new LazyReloadIter<>(reload.get());
+ }
+}
diff --git
a/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/LazyReloadIter.java
b/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/LazyReloadIter.java
new file mode 100644
index 00000000000..495dffcdfed
--- /dev/null
+++
b/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/LazyReloadIter.java
@@ -0,0 +1,70 @@
+/*
+ * 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.util.Lists;
+
+import java.util.Iterator;
+import java.util.List;
+import java.util.NoSuchElementException;
+
+public class LazyReloadIter<T> implements Iterator<T> {
+ private final List<T> buf = Lists.newArrayList();
+ private final Reload<T> reload;
+ private int cur = 0;
+ private boolean exhausted = false;
+
+ public LazyReloadIter(Reload<T> reload) {
+ this.reload = reload;
+ }
+
+ @Override
+ public boolean hasNext() {
+ if (exhausted && buf.isEmpty()) {
+ return false;
+ }
+ if (cur >= buf.size()) {
+ // Reset the buffer and load more elements.
+ buf.clear();
+ cur = 0;
+ // Reload the next batch.
+ boolean exhausted = reload.fill(buf);
+ while (buf.isEmpty() && !exhausted) {
+ exhausted = reload.fill(buf);
+ }
+
+ if (exhausted) {
+ this.exhausted = true;
+ }
+
+ return !buf.isEmpty();
+ }
+ return true;
+ }
+
+ @Override
+ public T next() {
+ if (hasNext()) {
+ return buf.get(cur++);
+ } else {
+ throw new NoSuchElementException();
+ }
+ }
+}
+
diff --git
a/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/Reload.java
b/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/Reload.java
new file mode 100644
index 00000000000..74144e00aa4
--- /dev/null
+++
b/hadoop-cloud-storage-project/hadoop-tos/src/main/java/org/apache/hadoop/fs/tosfs/common/Reload.java
@@ -0,0 +1,29 @@
+/*
+ * 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 java.util.List;
+
+public interface Reload<T> {
+ /**
+ * @param buf contains the filled data
+ * @return true if no need to fill again since the source is exhausted,
otherwise false.
+ */
+ boolean fill(List<T> buf);
+}
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