Java tutorial
/* * Copyright 2013-2017 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.springframework.cloud.sleuth.instrument.web; import java.io.IOException; import java.lang.invoke.MethodHandles; import javax.servlet.ServletOutputStream; import javax.servlet.WriteListener; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.cloud.sleuth.Span; /** * @author Marcin Grzejszczak */ class TraceServletOutputStream extends ServletOutputStream { private static final Log log = LogFactory.getLog(MethodHandles.lookup().lookupClass()); private final ServletOutputStream delegate; private final Span span; TraceServletOutputStream(ServletOutputStream delegate, Span span) { this.delegate = delegate; this.span = span; } @Override public boolean isReady() { return this.delegate.isReady(); } @Override public void setWriteListener(WriteListener listener) { this.delegate.setWriteListener(listener); } @Override public void write(int b) throws IOException { this.delegate.write(b); } @Override public void print(String s) throws IOException { this.delegate.print(s); } @Override public void print(boolean b) throws IOException { this.delegate.print(b); } @Override public void print(char c) throws IOException { this.delegate.print(c); } @Override public void print(int i) throws IOException { this.delegate.print(i); } @Override public void print(long l) throws IOException { this.delegate.print(l); } @Override public void print(float f) throws IOException { this.delegate.print(f); } @Override public void print(double d) throws IOException { this.delegate.print(d); } @Override public void println() throws IOException { this.delegate.println(); } @Override public void println(String s) throws IOException { this.delegate.println(s); } @Override public void println(boolean b) throws IOException { this.delegate.println(b); } @Override public void println(char c) throws IOException { this.delegate.println(c); } @Override public void println(int i) throws IOException { this.delegate.println(i); } @Override public void println(long l) throws IOException { this.delegate.println(l); } @Override public void println(float f) throws IOException { this.delegate.println(f); } @Override public void println(double d) throws IOException { this.delegate.println(d); } @Override public void write(byte[] b) throws IOException { this.delegate.write(b); } @Override public void write(byte[] b, int off, int len) throws IOException { this.delegate.write(b, off, len); } @Override public void flush() throws IOException { if (log.isTraceEnabled()) { log.trace("Will annotate SS once the stream is flushed"); } SsLogSetter.annotateWithServerSendIfLogIsNotAlreadyPresent(this.span); this.delegate.flush(); } @Override public void close() throws IOException { if (log.isTraceEnabled()) { log.trace("Will annotate SS once the stream is closed"); } SsLogSetter.annotateWithServerSendIfLogIsNotAlreadyPresent(this.span); this.delegate.close(); } }