/*
* 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.flink.api.common.io;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.flink.core.io.InputSplit;
import org.apache.flink.core.io.InputSplitAssigner;
/**
* This is the default implementation of the {@link InputSplitAssigner} interface. The default input split assigner
* simply returns all input splits of an input vertex in the order they were originally computed.
*/
public class DefaultInputSplitAssigner implements InputSplitAssigner {
/** The logging object used to report information and errors. */
private static final Logger LOG = LoggerFactory.getLogger(DefaultInputSplitAssigner.class);
/** The list of all splits */
private final List<InputSplit> splits = new ArrayList<InputSplit>();
public DefaultInputSplitAssigner(InputSplit[] splits) {
Collections.addAll(this.splits, splits);
}
public DefaultInputSplitAssigner(Collection<? extends InputSplit> splits) {
this.splits.addAll(splits);
}
@Override
public InputSplit getNextInputSplit(String host) {
InputSplit next = null;
// keep the synchronized part short
synchronized (this.splits) {
if (this.splits.size() > 0) {
next = this.splits.remove(this.splits.size() - 1);
}
}
if (LOG.isDebugEnabled()) {
if (next == null) {
LOG.debug("No more input splits available");
} else {
LOG.debug("Assigning split " + next + " to " + host);
}
}
return next;
}
}