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/**
* 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 net.logstash.logback;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.apache.juli.logging.ch.qos.logback.core.encoder.Encoder;
/**
* Provides backwards compatibility at runtime with logback 1.1.x.
*
* In logback version 1.2.0, the {@link Encoder} interface was changed from
* writing to an {@link OutputStream} to returning byte arrays.
* This was a backwards incompatible change, therefore some fancy runtime reflection
* is required to make logstash-logback-encoder work with both pre- and post-1.2 logback versions.
*
* This class is used to determine if logback 1.1 is on the runtime classpath ({@link #isLogback11OrBefore()}),
* and invoke the old methods on the {@link Encoder} interface.
*/
public class Logback11Support {
private static final Method ENCODER_INIT_METHOD = getMethod(Encoder.class, "init", OutputStream.class);
private static final Method ENCODER_DO_ENCODE_METHOD = getMethod(Encoder.class, "doEncode", Object.class);
private static final Method ENCODER_CLOSE_METHOD = getMethod(Encoder.class, "close");
private static final boolean IS_LOGBACK_1_1 = ENCODER_INIT_METHOD != null;
/**
* Returns true if logback 1.1.x or earlier is on the runtime classpath.
* Returns false if logback 1.2.x or later is on the runtime classpath
*/
public static boolean isLogback11OrBefore() {
return IS_LOGBACK_1_1;
}
/**
* Called by logic that should only execute if logback 1.1.x or earlier is on the runtime classpath.
*
* @throws IllegalStateException if the logback version is >= 1.2
*/
public static void verifyLogback11OrBefore() {
if (!isLogback11OrBefore()) {
throw new IllegalStateException("Logback 1.1 only method called, but Logback version is >= 1.2");
}
}
/**
* Called by logic that should only execute if logback 1.2.x or later is on the runtime classpath.
*
* @throws IllegalStateException if the logback version is < 1.2
*/
public static void verifyLogback12OrAfter() {
if (isLogback11OrBefore()) {
throw new IllegalStateException("Logback 1.2+ method called, but Logback version is < 1.2");
}
}
/**
* Invokes the init method of a logback 1.1 encoder, with the given outputStream as the argument.
*/
public static void init(Encoder encoder, OutputStream outputStream) throws IOException {
verifyLogback11OrBefore();
try {
ENCODER_INIT_METHOD.invoke(encoder, outputStream);
} catch (IllegalArgumentException e) {
throw new IllegalStateException("Unable to initialize logback 1.1 encoder " + encoder, e);
} catch (IllegalAccessException e) {
throw new IllegalStateException("Unable to initialize logback 1.1 encoder " + encoder, e);
} catch (InvocationTargetException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
} else if (e.getCause() instanceof RuntimeException) {
throw (RuntimeException) e.getCause();
} else {
throw new IllegalStateException("Unable to initialize logback 1.1 encoder " + encoder, e.getCause());
}
}
}
/**
* Invokes the doEncode method of a logback 1.1 encoder, with the given event as the argument.
*/
public static void doEncode(Encoder encoder, Object event) throws IOException {
verifyLogback11OrBefore();
try {
ENCODER_DO_ENCODE_METHOD.invoke(encoder, event);
} catch (IllegalArgumentException e) {
throw new IllegalStateException("Unable to encode event with logback 1.1 encoder " + encoder, e);
} catch (IllegalAccessException e) {
throw new IllegalStateException("Unable to encode event with logback 1.1 encoder " + encoder, e);
} catch (InvocationTargetException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
} else if (e.getCause() instanceof RuntimeException) {
throw (RuntimeException) e.getCause();
} else {
throw new IllegalStateException("Unable to encode event with logback 1.1 encoder " + encoder, e.getCause());
}
}
}
/**
* Invokes the close method of a logback 1.1 encoder.
*/
public static void close(Encoder encoder) throws IOException {
verifyLogback11OrBefore();
try {
ENCODER_CLOSE_METHOD.invoke(encoder);
} catch (IllegalArgumentException e) {
throw new IllegalStateException("Unable to close logback 1.1 encoder " + encoder, e);
} catch (IllegalAccessException e) {
throw new IllegalStateException("Unable to close logback 1.1 encoder " + encoder, e);
} catch (InvocationTargetException e) {
if (e.getCause() instanceof IOException) {
throw (IOException) e.getCause();
} else if (e.getCause() instanceof RuntimeException) {
throw (RuntimeException) e.getCause();
} else {
throw new IllegalStateException("Unable to close logback 1.1 encoder " + encoder, e.getCause());
}
}
}
/**
* Returns the specified method of the given class, or null if it can't be found.
*/
private static Method getMethod(Class clazz, String methodName, Class... parameterTypes) {
try {
return clazz.getMethod(methodName, parameterTypes);
} catch (SecurityException e) {
return null;
} catch (NoSuchMethodException e) {
return null;
}
}
}
