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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Intel Crop. All rights reserved.
* Modifications Copyright (C) 2020-2021 AT&T Intellectual Property. All rights reserved.
* Modifications Copyright (C) 2022 Nordix Foundation.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.distribution.forwarding.file;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.InvalidPathException;
import java.nio.file.Paths;
import java.util.Collection;
import org.onap.policy.common.parameters.ParameterService;
import org.onap.policy.distribution.forwarding.PolicyForwarder;
import org.onap.policy.distribution.forwarding.PolicyForwardingException;
import org.onap.policy.models.tosca.authorative.concepts.ToscaEntity;
import org.onap.policy.models.tosca.authorative.concepts.ToscaPolicy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This class provides an implementation of {@link PolicyForwarder} interface for forwarding the given policies to a
* file directory.
*/
public class FilePolicyForwarder implements PolicyForwarder {
private static final Logger LOGGER = LoggerFactory.getLogger(FilePolicyForwarder.class);
private FilePolicyForwarderParameterGroup fileForwarderParameters;
/**
* {@inheritDoc}.
*/
@Override
public void configure(final String parameterGroupName) {
fileForwarderParameters = ParameterService.get(parameterGroupName);
try {
final var path = Paths.get(fileForwarderParameters.getPath());
if (!path.toFile().exists()) {
Files.createDirectories(path);
}
} catch (final InvalidPathException | IOException e) {
LOGGER.error("Configuring FilePolicyForwarder failed!", e);
}
}
/**
* {@inheritDoc}.
*/
@Override
public void forward(final Collection<ToscaEntity> policies) throws PolicyForwardingException {
for (final ToscaEntity policy : policies) {
if (policy instanceof ToscaPolicy) {
forwardPolicy((ToscaPolicy) policy);
} else {
final String message = "Cannot forward policy " + policy + ". Unsupported policy type "
+ policy.getClass().getSimpleName();
LOGGER.error(message);
throw new PolicyForwardingException(message);
}
}
}
/**
* Method to forward a given policy to be logged into a file.
*
* @param pol the policy
* @throws PolicyForwardingException if any exception occurs while forwarding policy
*/
private void forwardPolicy(final ToscaPolicy pol) throws PolicyForwardingException {
final String name = pol.getName();
final var path = Paths.get(fileForwarderParameters.getPath(), name);
try (var writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8)) {
writer.write("policyName: " + name);
if (fileForwarderParameters.isVerbose()) {
writer.newLine();
writer.write("policy: " + pol);
}
LOGGER.debug("Successfully forwarded the policy to store into file {}.", path);
} catch (final InvalidPathException | IOException exp) {
final String message = "Error sending policy to file under path:" + fileForwarderParameters.getPath();
throw new PolicyForwardingException(message, exp);
}
}
}
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