org.glowroot.instrumentation.engine.weaving.GenericMessageSupplier Maven / Gradle / Ivy
/*
* Copyright 2013-2019 the original author or authors.
*
* 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.glowroot.instrumentation.engine.weaving;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.glowroot.instrumentation.api.Message;
import org.glowroot.instrumentation.api.MessageSupplier;
import org.glowroot.instrumentation.api.Span;
import org.glowroot.instrumentation.engine.weaving.MessageTemplateImpl.ArgPathPart;
import org.glowroot.instrumentation.engine.weaving.MessageTemplateImpl.ConstantPart;
import org.glowroot.instrumentation.engine.weaving.MessageTemplateImpl.Part;
import org.glowroot.instrumentation.engine.weaving.MessageTemplateImpl.PartType;
import org.glowroot.instrumentation.engine.weaving.MessageTemplateImpl.ValuePathPart;
public class GenericMessageSupplier extends MessageSupplier {
private final MessageTemplateImpl template;
private final String[] resolvedReceiverPathParts;
private final String[] resolvedArgPathParts;
private volatile String /*@MonotonicNonNull*/[] resolvedReturnValuePathParts;
private final String methodName;
public static GenericMessageSupplier create(MessageTemplateImpl template, Object receiver,
String methodName, @Nullable Object... args) {
// render paths to strings immediately in case the objects are mutable
String[] resolvedReceiverPathParts = new String[template.getThisPathParts().size()];
int i = 0;
for (ValuePathPart part : template.getThisPathParts()) {
resolvedReceiverPathParts[i++] = part.evaluatePart(receiver);
}
String[] resolvedArgPathParts = new String[template.getArgPathParts().size()];
i = 0;
for (ArgPathPart part : template.getArgPathParts()) {
if (part.getArgNumber() >= args.length) {
resolvedArgPathParts[i++] =
"";
} else {
resolvedArgPathParts[i++] = part.evaluatePart(args[part.getArgNumber()]);
}
}
return new GenericMessageSupplier(template, resolvedReceiverPathParts, resolvedArgPathParts,
methodName);
}
private GenericMessageSupplier(MessageTemplateImpl template, String[] resolvedReceiverPathParts,
String[] resolvedArgPathParts, String methodName) {
this.template = template;
this.resolvedReceiverPathParts = resolvedReceiverPathParts;
this.resolvedArgPathParts = resolvedArgPathParts;
this.methodName = methodName;
}
private void setReturnValue(@Nullable Object returnValue) {
// render the return value to strings immediately in case it is mutable
String[] parts = new String[template.getReturnPathParts().size()];
int i = 0;
for (ValuePathPart part : template.getReturnPathParts()) {
parts[i++] = part.evaluatePart(returnValue);
}
this.resolvedReturnValuePathParts = parts;
}
@Override
public Message get() {
return Message.create(getMessageText());
}
public String getMessageText() {
StringBuilder sb = new StringBuilder();
int receiverPathPartIndex = 0;
int argPathPartIndex = 0;
int returnValuePathPartIndex = 0;
for (Part part : template.getAllParts()) {
PartType partType = part.getType();
switch (partType) {
case CONSTANT:
sb.append(((ConstantPart) part).getConstant());
break;
case THIS_PATH:
sb.append(resolvedReceiverPathParts[receiverPathPartIndex++]);
break;
case ARG_PATH:
sb.append(resolvedArgPathParts[argPathPartIndex++]);
break;
case RETURN_PATH:
if (resolvedReturnValuePathParts != null) {
sb.append(resolvedReturnValuePathParts[returnValuePathPartIndex++]);
}
break;
case METHOD_NAME:
sb.append(methodName);
break;
default:
throw new AssertionError("Unknown PartType enum: " + partType);
}
}
return sb.toString();
}
public static void updateWithReturnValue(Span span, @Nullable Object returnValue) {
GenericMessageSupplier messageSupplier = (GenericMessageSupplier) span.getMessageSupplier();
if (messageSupplier != null) {
// messageSupplier can be null, e.g. if a span limit imposed by the agent was
// exceeded
messageSupplier.setReturnValue(returnValue);
}
}
}