hadoop FutureDataInputStreamBuilderImpl 源码
haddop FutureDataInputStreamBuilderImpl 代码
文件路径:/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/impl/FutureDataInputStreamBuilderImpl.java
/*
* 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.impl;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.IOException;
import java.util.concurrent.CompletableFuture;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileContext;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.FutureDataInputStreamBuilder;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.PathHandle;
import static java.util.Objects.requireNonNull;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_DEFAULT;
import static org.apache.hadoop.fs.CommonConfigurationKeysPublic.IO_FILE_BUFFER_SIZE_KEY;
/**
* Builder for input streams and subclasses whose return value is
* actually a completable future: this allows for better asynchronous
* operation.
*
* To be more generic, {@link #opt(String, int)} and {@link #must(String, int)}
* variants provide implementation-agnostic way to customize the builder.
* Each FS-specific builder implementation can interpret the FS-specific
* options accordingly, for example:
*
* If the option is not related to the file system, the option will be ignored.
* If the option is must, but not supported/known by the file system, an
* {@link IllegalArgumentException} will be thrown.
*
*/
@InterfaceAudience.Public
@InterfaceStability.Unstable
public abstract class FutureDataInputStreamBuilderImpl
extends AbstractFSBuilderImpl<CompletableFuture<FSDataInputStream>, FutureDataInputStreamBuilder>
implements FutureDataInputStreamBuilder {
private final FileSystem fileSystem;
private int bufferSize;
/**
* File status passed in through a {@link #withFileStatus(FileStatus)}
* call; null otherwise.
*/
private FileStatus status;
/**
* Construct from a {@link FileContext}.
*
* @param fc FileContext
* @param path path.
* @throws IOException failure
*/
protected FutureDataInputStreamBuilderImpl(@Nonnull FileContext fc,
@Nonnull Path path) throws IOException {
super(requireNonNull(path, "path"));
requireNonNull(fc, "file context");
this.fileSystem = null;
bufferSize = IO_FILE_BUFFER_SIZE_DEFAULT;
}
/**
* Constructor.
* @param fileSystem owner FS.
* @param path path
*/
protected FutureDataInputStreamBuilderImpl(@Nonnull FileSystem fileSystem,
@Nonnull Path path) {
super(requireNonNull(path, "path"));
this.fileSystem = requireNonNull(fileSystem, "fileSystem");
initFromFS();
}
/**
* Constructor with PathHandle.
* @param fileSystem owner FS.
* @param pathHandle path handle
*/
public FutureDataInputStreamBuilderImpl(@Nonnull FileSystem fileSystem,
@Nonnull PathHandle pathHandle) {
super(pathHandle);
this.fileSystem = fileSystem;
initFromFS();
}
/**
* Initialize from a filesystem.
*/
private void initFromFS() {
bufferSize = fileSystem.getConf().getInt(IO_FILE_BUFFER_SIZE_KEY,
IO_FILE_BUFFER_SIZE_DEFAULT);
}
protected FileSystem getFS() {
requireNonNull(fileSystem, "fileSystem");
return fileSystem;
}
protected int getBufferSize() {
return bufferSize;
}
/**
* Set the size of the buffer to be used.
*
* @param bufSize buffer size.
* @return FutureDataInputStreamBuilder.
*/
public FutureDataInputStreamBuilder bufferSize(int bufSize) {
bufferSize = bufSize;
return getThisBuilder();
}
/**
* Get the builder.
* This must be used after the constructor has been invoked to create
* the actual builder: it allows for subclasses to do things after
* construction.
*
* @return FutureDataInputStreamBuilder.
*/
public FutureDataInputStreamBuilder builder() {
return getThisBuilder();
}
@Override
public FutureDataInputStreamBuilder getThisBuilder() {
return this;
}
@Override
public FutureDataInputStreamBuilder withFileStatus(
@Nullable FileStatus st) {
this.status = st;
return this;
}
/**
* Get any status set in {@link #withFileStatus(FileStatus)}.
* @return a status value or null.
*/
protected FileStatus getStatus() {
return status;
}
}
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