com.datastax.oss.driver.internal.core.config.composite.CompositeDriverConfigLoader Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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,
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* See the License for the specific language governing permissions and
* limitations under the License.
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package com.datastax.oss.driver.internal.core.config.composite;
import com.datastax.oss.driver.api.core.config.DriverConfig;
import com.datastax.oss.driver.api.core.config.DriverConfigLoader;
import com.datastax.oss.driver.api.core.context.DriverContext;
import com.datastax.oss.driver.internal.core.util.concurrent.CompletableFutures;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.util.Objects;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionStage;
public class CompositeDriverConfigLoader implements DriverConfigLoader {
private final DriverConfigLoader primaryConfigLoader;
private final DriverConfigLoader fallbackConfigLoader;
public CompositeDriverConfigLoader(
@NonNull DriverConfigLoader primaryConfigLoader,
@NonNull DriverConfigLoader fallbackConfigLoader) {
this.primaryConfigLoader = Objects.requireNonNull(primaryConfigLoader);
this.fallbackConfigLoader = Objects.requireNonNull(fallbackConfigLoader);
}
@NonNull
@Override
public DriverConfig getInitialConfig() {
DriverConfig primaryConfig = primaryConfigLoader.getInitialConfig();
DriverConfig fallbackConfig = fallbackConfigLoader.getInitialConfig();
return new CompositeDriverConfig(primaryConfig, fallbackConfig);
}
@Override
public void onDriverInit(@NonNull DriverContext context) {
fallbackConfigLoader.onDriverInit(context);
primaryConfigLoader.onDriverInit(context);
}
@NonNull
@Override
public CompletionStage reload() {
if (!primaryConfigLoader.supportsReloading() && !fallbackConfigLoader.supportsReloading()) {
return CompletableFutures.failedFuture(
new UnsupportedOperationException(
"Reloading is not supported (this is a composite config, "
+ "and neither the primary nor the fallback are reloadable)"));
} else if (!primaryConfigLoader.supportsReloading()) {
return fallbackConfigLoader.reload();
} else if (!fallbackConfigLoader.supportsReloading()) {
return primaryConfigLoader.reload();
} else {
CompletionStage primaryFuture = primaryConfigLoader.reload();
CompletionStage fallbackFuture = fallbackConfigLoader.reload();
CompletableFuture compositeFuture = new CompletableFuture<>();
primaryFuture.whenComplete(
(primaryChanged, primaryError) ->
fallbackFuture.whenComplete(
(fallbackChanged, fallbackError) -> {
if (primaryError == null && fallbackError == null) {
compositeFuture.complete(primaryChanged || fallbackChanged);
} else if (fallbackError == null) {
compositeFuture.completeExceptionally(primaryError);
} else if (primaryError == null) {
compositeFuture.completeExceptionally(fallbackError);
} else {
primaryError.addSuppressed(fallbackError);
compositeFuture.completeExceptionally(primaryError);
}
}));
return compositeFuture;
}
}
@Override
public boolean supportsReloading() {
return primaryConfigLoader.supportsReloading() || fallbackConfigLoader.supportsReloading();
}
@Override
public void close() {
primaryConfigLoader.close();
fallbackConfigLoader.close();
}
}