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/*
* Copyright 2022 Accenture Global Solutions 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.finos.tracdap.common.util;
import org.finos.tracdap.metadata.TagHeader;
import org.finos.tracdap.metadata.TagSelector;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.*;
import java.util.Collection;
import java.util.Set;
import java.util.concurrent.CompletionException;
import java.util.concurrent.CompletionStage;
public class InterfaceLogging implements InvocationHandler {
private static final Set> LOGGABLE_METADATA_TYPES = Set.of(
TagSelector.class,
TagHeader.class);
private final Object impl;
private final Logger log;
@SuppressWarnings("unchecked")
public static
I wrap(T impl, Class iface) {
var logger = LoggerFactory.getLogger(impl.getClass());
var handler = new InterfaceLogging(impl, logger);
var proxy = Proxy.newProxyInstance(impl.getClass().getClassLoader(), new Class[]{iface}, handler);
return (I) proxy;
}
private InterfaceLogging(Object impl, Logger log) {
this.impl = impl;
this.log = log;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
var params = method.getParameters();
var paramInfo = new String[params.length];
for (var paramIndex = 0; paramIndex < params.length; paramIndex++)
paramInfo[paramIndex] = params[paramIndex].getName() + " = " + argToString(args[paramIndex]);
try {
log.info("START: {} {}", method.getName(), String.join(", ", paramInfo));
var result = method.invoke(impl, args);
// For async methods, logging success/fail status must be applied after the async operation completes
if (CompletionStage.class.isAssignableFrom(method.getReturnType()))
return applyAsyncLogging(method, (CompletionStage) result);
// For synchronous methods, we can log success as soon as the method returns
log.info("SUCCEEDED: {}", method.getName());
return result;
}
// If the method blows up before returning a value, log a failure for both async and synchronous methods
// In the async case, a completion stage has not been successfully created
catch (InvocationTargetException e) {
log.error("FAILED: {} {}", method.getName(), e.getTargetException().getMessage(), e.getTargetException());
throw e.getTargetException();
}
catch (Throwable e) {
log.error("FAILED: {} Unexpected error logging method status ({})", method.getName(), e.getMessage(), e);
throw e;
}
}
private String argToString(Object arg) {
if (arg == null)
return "(null)";
// For some small, common metadata classes (IDs and selectors) it is helpful to log them out
if (LOGGABLE_METADATA_TYPES.contains(arg.getClass())) {
var oneLiner = arg.toString()
.stripTrailing()
.replaceAll(": ", " = ")
.replaceAll("\n", ", ");
return arg.getClass().getSimpleName() + " (" + oneLiner + ")";
}
// Do not log full contents of generated protobuf classes, they can be big!
if (arg instanceof com.google.protobuf.Message)
return String.format("(metadata %s)", arg.getClass().getSimpleName());
// Do not log the contents of collections either!
if (arg instanceof Collection)
return String.format("(collection %s, size=%d)", arg.getClass().getSimpleName(), ((Collection) arg).size());
return arg.toString();
}
private CompletionStage applyAsyncLogging(Method method, CompletionStage asyncOperation) {
return asyncOperation
.thenApply(x -> {
log.info("SUCCEEDED: {}", method.getName());
return x;
})
.exceptionally(e -> {
if (e instanceof CompletionException) {
log.error("FAILED: {} {}", method.getName(), e.getCause().getMessage(), e.getCause());
throw (CompletionException) e;
}
else {
log.error("FAILED: {} {}", method.getName(), e.getMessage(), e);
throw new CompletionException(e);
}
});
}
}
