org.apache.sshd.common.future.WaitableFuture 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.future;
import java.io.IOException;
import java.time.Duration;
import java.util.concurrent.TimeUnit;
/**
* Represents an asynchronous operation which one can wait for its completion. Note: the only thing guaranteed is
* that if {@code true} is returned from one of the {@code awaitXXX} methods then the operation has completed. However,
* the caller has to determine whether it was a successful or failed completion.
*
* @author Apache MINA SSHD Project
*/
public interface WaitableFuture {
/**
* @return Some identifier useful as {@code toString()} value
*/
Object getId();
/**
* Wait {@link Long#MAX_VALUE} msec. for the asynchronous operation to complete. The attached listeners will be
* notified when the operation is completed.
*
* @return {@code true} if the operation is completed.
* @throws IOException if failed - specifically {@link java.io.InterruptedIOException} if waiting was interrupted
* @see #await(long)
*/
default boolean await() throws IOException {
return await(Long.MAX_VALUE);
}
/**
* Wait for the asynchronous operation to complete with the specified timeout.
*
* @param timeout The number of time units to wait
* @param unit The {@link TimeUnit} for waiting
* @return {@code true} if the operation is completed.
* @throws IOException if failed - specifically {@link java.io.InterruptedIOException} if waiting was interrupted
* @see #await(long)
*/
default boolean await(long timeout, TimeUnit unit) throws IOException {
return await(unit.toMillis(timeout));
}
/**
* Wait for the asynchronous operation to complete with the specified timeout.
*
* @param timeout The maximum duration to wait, null to wait forever
* @return {@code true} if the operation is completed.
* @throws IOException if failed - specifically {@link java.io.InterruptedIOException} if waiting was interrupted
* @see #await(long)
*/
default boolean await(Duration timeout) throws IOException {
return timeout != null ? await(timeout.toMillis()) : await();
}
/**
* Wait for the asynchronous operation to complete with the specified timeout.
*
* @param timeoutMillis Wait time in milliseconds
* @return {@code true} if the operation is completed.
* @throws IOException if failed - specifically {@link java.io.InterruptedIOException} if waiting was interrupted
*/
boolean await(long timeoutMillis) throws IOException;
/**
* Wait {@link Long#MAX_VALUE} msec. for the asynchronous operation to complete uninterruptibly. The attached
* listeners will be notified when the operation is completed.
*
* @return {@code true} if the operation is completed.
* @see #awaitUninterruptibly(long)
*/
default boolean awaitUninterruptibly() {
return awaitUninterruptibly(Long.MAX_VALUE);
}
/**
* Wait for the asynchronous operation to complete with the specified timeout uninterruptibly.
*
* @param timeout The number of time units to wait
* @param unit The {@link TimeUnit} for waiting
* @return {@code true} if the operation is completed.
* @see #awaitUninterruptibly(long)
*/
default boolean awaitUninterruptibly(long timeout, TimeUnit unit) {
return awaitUninterruptibly(unit.toMillis(timeout));
}
/**
* Wait for the asynchronous operation to complete with the specified timeout uninterruptibly.
*
* @param timeoutMillis Wait time, null to wait forever
* @return {@code true} if the operation is finished.
*/
default boolean awaitUninterruptibly(Duration timeoutMillis) {
return timeoutMillis != null ? awaitUninterruptibly(timeoutMillis.toMillis()) : awaitUninterruptibly();
}
/**
* Wait for the asynchronous operation to complete with the specified timeout uninterruptibly.
*
* @param timeoutMillis Wait time in milliseconds
* @return {@code true} if the operation is finished.
*/
boolean awaitUninterruptibly(long timeoutMillis);
/**
* @return {@code true} if the asynchronous operation is completed. Note: it is up to the caller to
* determine whether it was a successful or failed completion.
*/
boolean isDone();
}