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/*
* Copyright 2017 Google LLC
*
* 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
*
* 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 com.google.cloud.bigtable.hbase2_x;
import com.google.api.core.ApiFuture;
import com.google.api.core.ApiFutureCallback;
import com.google.api.core.ApiFutures;
import com.google.api.core.InternalApi;
import com.google.common.util.concurrent.MoreExecutors;
import java.util.concurrent.CompletableFuture;
/**
* Utility methods for converting gax {@link ApiFuture} to {@link CompletableFuture}.
*
* For internal use only - public for technical reasons.
*/
@InternalApi("For internal usage only")
public class ApiFutureUtils {
public static CompletableFuture toCompletableFuture(ApiFuture apiFuture) {
CompletableFuture completableFuture =
new CompletableFuture() {
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
boolean result = apiFuture.cancel(mayInterruptIfRunning);
super.cancel(mayInterruptIfRunning);
return result;
}
};
ApiFutureCallback callback =
new ApiFutureCallback() {
public void onFailure(Throwable throwable) {
completableFuture.completeExceptionally(throwable);
}
public void onSuccess(T t) {
completableFuture.complete(t);
}
};
ApiFutures.addCallback(apiFuture, callback, MoreExecutors.directExecutor());
return completableFuture;
}
public static CompletableFuture failedFuture(Throwable error) {
CompletableFuture future = new CompletableFuture<>();
future.completeExceptionally(error);
return future;
}
}