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/*
* Copyright © 2016-2018 European Support Limited
*
* 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 org.openecomp.sdc.logging.slf4j;
import org.slf4j.MDC;
import java.util.EnumMap;
import java.util.Map;
/**
* Because we don't know which information should be carried over from MDC, and which shouldn't, copy just the keys that
* the logging service uses.
*
* @author evitaliy
* @since 23 Mar 2018
*/
class MDCDelegate {
private MDCDelegate() {
// static methods only, prevent instantiation
}
/**
* Get a copy of logging MDC fields.
*/
static Map<ContextField, String> copy() {
Map<ContextField, String> copy = new EnumMap<>(ContextField.class);
for (ContextField k : ContextField.values()) {
String v = MDC.get(k.asKey());
if (v != null) {
copy.put(k, v);
}
}
return copy;
}
/**
* Reads all context fields from MDC.
*/
static Map<ContextField, String> get() {
return get(ContextField.values());
}
/**
* Reads selected fields from MDC.
*/
static Map<ContextField, String> get(ContextField... fields) {
Map<ContextField, String> values = new EnumMap<>(ContextField.class);
for (ContextField key : fields) {
values.put(key, MDC.get(key.asKey()));
}
return values;
}
/**
* Entirely replaces the logging MDC context with the content of the argument. Logging keys that are not present in
* the input map will be cleared from MDC.
*/
static void replace(Map<ContextField, String> values) {
for (ContextField key : ContextField.values()) {
updateKey(key, values.get(key));
}
}
/**
* Push data by multiple data providers on MDC.
*/
static void put(ContextProvider... dataProviders) {
clear();
for (ContextProvider provider : dataProviders) {
push(provider.values());
}
}
/**
* Updates the logging MDC context with the content of the argument. Logging keys that are not present in the input
* map will remain "as is", keys with null values will be cleared from MDC.
*/
private static void push(Map<ContextField, String> values) {
for (Map.Entry<ContextField, String> entry : values.entrySet()) {
updateKey(entry.getKey(), entry.getValue());
}
}
private static void updateKey(ContextField key, String value) {
if (value != null) {
MDC.put(key.asKey(), value);
} else {
MDC.remove(key.asKey());
}
}
static void clear() {
for (ContextField field : ContextField.values()) {
MDC.remove(field.asKey());
}
}
}
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