com.github.triceo.robozonky.app.configuration.RefreshableInvestmentStrategy Maven / Gradle / Ivy
/*
* Copyright 2017 Lukáš Petrovický
*
* 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.github.triceo.robozonky.app.configuration;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Optional;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import com.github.triceo.robozonky.api.Refreshable;
import com.github.triceo.robozonky.api.strategies.InvestmentStrategy;
import com.github.triceo.robozonky.common.extensions.InvestmentStrategyLoader;
import com.github.triceo.robozonky.internal.api.Defaults;
import com.github.triceo.robozonky.util.Scheduler;
final class RefreshableInvestmentStrategy extends Refreshable {
private static URL convertToUrl(final String maybeUrl) {
try {
return new URL(maybeUrl);
} catch (final MalformedURLException e) {
try {
return new File(maybeUrl).toURI().toURL();
} catch (final NullPointerException | MalformedURLException e1) {
throw new IllegalStateException("Cannot load strategy " + maybeUrl, e1);
}
}
}
public static Refreshable create(final String maybeUrl) {
final Refreshable result =
new RefreshableInvestmentStrategy(RefreshableInvestmentStrategy.convertToUrl(maybeUrl));
Scheduler.BACKGROUND_SCHEDULER.submit(result);
return result;
}
private final URL url;
private RefreshableInvestmentStrategy(final URL target) {
this.url = target;
}
@Override
public Optional> getDependedOn() {
return Optional.empty();
}
@Override
protected Supplier> getLatestSource() {
return () -> {
try (final BufferedReader r = new BufferedReader(new InputStreamReader(url.openStream(), Defaults.CHARSET))) {
return Optional.of(r.lines().collect(Collectors.joining(System.lineSeparator())));
} catch (final IOException ex) {
LOGGER.warn("Failed reading strategy.", ex);
return Optional.empty();
}
};
}
@Override
protected Optional transform(final String source) {
return InvestmentStrategyLoader.load(source);
}
}