org.apache.sshd.common.util.closeable.SequentialCloseable Maven / Gradle / Ivy
/*
* 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.sshd.common.util.closeable;
import java.util.Collections;
import java.util.Iterator;
import org.apache.sshd.common.Closeable;
import org.apache.sshd.common.future.CloseFuture;
import org.apache.sshd.common.future.SshFutureListener;
/**
* Waits for a group of {@link Closeable}s to complete in the given order, then signals the completion by setting the
* "parent" future as closed
*
* @author Apache MINA SSHD Project
*/
public class SequentialCloseable extends SimpleCloseable {
private final Iterable closeables;
public SequentialCloseable(Object id, Object lock, Iterable closeables) {
super(id, lock);
this.closeables = (closeables == null) ? Collections.emptyList() : closeables;
}
@Override
protected void doClose(boolean immediately) {
Iterator iterator = closeables.iterator();
SshFutureListener listener = new SshFutureListener() {
@SuppressWarnings("synthetic-access")
@Override
public void operationComplete(CloseFuture previousFuture) {
boolean traceEnabled = log.isTraceEnabled();
while (iterator.hasNext()) {
Closeable c = iterator.next();
if (c != null) {
if (traceEnabled) {
log.trace("doClose({}) closing {} immediately={}", this, c, immediately);
}
CloseFuture nextFuture = c.close(immediately);
nextFuture.addListener(this);
return;
}
}
if (!iterator.hasNext()) {
if (log.isDebugEnabled()) {
log.debug("doClose({}) signal close complete immediately={}", this, immediately);
}
future.setClosed();
}
}
};
listener.operationComplete(null);
}
}