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API for snapshot support to be used by stores

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// Copyright 2015-2024 Nstream, inc.
//
// 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 nstream.persist.store.snapshot;

import java.util.ServiceConfigurationError;
import java.util.ServiceLoader;
import swim.uri.Uri;

public final class SnapshotServiceLoader {

  private SnapshotServiceLoader() { }

  /**
   * Enumerate all of the {@link SnapshotService}s available in the module/class path and return an
   * instance of the first to support the specified URI.
   * @param uri The URI of snapshot repository.
   * @return A snapshot service that supports the provided URI.
   * @throws SnapshotException No available service supports the URI.
   */
  public static SnapshotService findSnapshotService(Uri uri) throws SnapshotException {
    if (uri == null) {
      throw new IllegalArgumentException("The URI must be non-null.");
    }
    try {
      final var services = ServiceLoader.load(SnapshotService.class);
      for (var service : services) {
        if (service.canHandle(uri)) {
          return service;
        }
      }
      throw new SnapshotException(String.format("No snapshot service was available that can handle %s.", uri));
    } catch (ServiceConfigurationError ex) {
      throw new SnapshotException("Could not load snapshot services.", ex);
    }
  }

}