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CompositeItemStream.java
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CompositeItemStream.java
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/*
* Copyright 2006-2022 the original author or authors.
*
* 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
*
* https://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.springframework.batch.item.support;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.springframework.batch.item.ExecutionContext;
import org.springframework.batch.item.ItemStream;
import org.springframework.batch.item.ItemStreamException;
/**
* Simple {@link ItemStream} that delegates to a list of other streams.
*
* @author Dave Syer
* @author Mahmoud Ben Hassine
*
*/
public class CompositeItemStream implements ItemStream {
private final List<ItemStream> streams = new ArrayList<>();
/**
* Public setter for the {@link ItemStream}s.
*
* @param streams {@link List} of {@link ItemStream}.
*/
public void setStreams(List<ItemStream> streams) {
this.streams.addAll(streams);
}
/**
* Public setter for the {@link ItemStream}s.
*
* @param streams array of {@link ItemStream}.
*/
public void setStreams(ItemStream[] streams) {
this.streams.addAll(Arrays.asList(streams));
}
/**
* Register a {@link ItemStream} as one of the interesting providers under
* the provided key.
*
* @param stream an instance of {@link ItemStream} to be added to the list of streams.
*/
public void register(ItemStream stream) {
synchronized (streams) {
if (!streams.contains(stream)) {
streams.add(stream);
}
}
}
/**
* Default constrcutor
*/
public CompositeItemStream() {
super();
}
/**
* Convenience constructor for setting the {@link ItemStream}s.
*
* @param streams {@link List} of {@link ItemStream}.
*/
public CompositeItemStream(List<ItemStream> streams) {
setStreams(streams);
}
/**
* Convenience constructor for setting the {@link ItemStream}s.
*
* @param streams array of {@link ItemStream}.
*/
public CompositeItemStream(ItemStream... streams) {
setStreams(streams);
}
/**
* Simple aggregate {@link ExecutionContext} provider for the contributions
* registered under the given key.
*
* @see org.springframework.batch.item.ItemStream#update(ExecutionContext)
*/
@Override
public void update(ExecutionContext executionContext) {
for (ItemStream itemStream : streams) {
itemStream.update(executionContext);
}
}
/**
* Broadcast the call to close.
* @throws ItemStreamException thrown if one of the {@link ItemStream}s in
* the list fails to close. This is a sequential operation so all itemStreams
* in the list after the one that failed to close will remain open.
*/
@Override
public void close() throws ItemStreamException {
for (ItemStream itemStream : streams) {
itemStream.close();
}
}
/**
* Broadcast the call to open.
*
* @throws ItemStreamException thrown if one of the {@link ItemStream}s in
* the list fails to open. This is a sequential operation so all itemStreams
* in the list after the one that failed to open will not be opened.
*/
@Override
public void open(ExecutionContext executionContext) throws ItemStreamException {
for (ItemStream itemStream : streams) {
itemStream.open(executionContext);
}
}
}