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/*******************************************************************************
* Copyright (c) 2000, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Julian Chen - fix for bug #92572, jclRM
* Sergey Prigogin (Google) - use parameterized types (bug 442021)
*******************************************************************************/
package org.eclipse.core.internal.runtime;
import java.util.ArrayList;
import org.eclipse.core.runtime.*;
/**
* NOT API!!! This log infrastructure was split from the InternalPlatform.
*
* @since org.eclipse.equinox.common 3.2
*/
public final class RuntimeLog {
private static ArrayList<ILogListener> logListeners = new ArrayList<>(5);
/**
* Keep the messages until the first log listener is registered.
* Once first log listeners is registred, it is going to receive
* all status messages accumulated during the period when no log
* listener was available.
*/
private static ArrayList<IStatus> queuedMessages = new ArrayList<>(5);
private static PlatformLogWriter logWriter;
static void setLogWriter(PlatformLogWriter logWriter) {
synchronized (logListeners) {
boolean firstListener = isEmpty();
RuntimeLog.logWriter = logWriter;
if (firstListener && logWriter != null)
emptyQueuedMessages();
}
}
/**
* See org.eclipse.core.runtime.Platform#addLogListener(ILogListener)
*/
public static void addLogListener(ILogListener listener) {
synchronized (logListeners) {
boolean firstListener = isEmpty();
// replace if already exists (Set behaviour but we use an array
// since we want to retain order)
logListeners.remove(listener);
logListeners.add(listener);
if (firstListener)
emptyQueuedMessages();
}
}
/**
* See org.eclipse.core.runtime.Platform#removeLogListener(ILogListener)
*/
public static void removeLogListener(ILogListener listener) {
synchronized (logListeners) {
logListeners.remove(listener);
}
}
/**
* Checks if the given listener is present
*/
public static boolean contains(ILogListener listener) {
synchronized (logListeners) {
return logListeners.contains(listener);
}
}
/**
* Notifies all listeners of the platform log.
*/
public static void log(final IStatus status) {
// create array to avoid concurrent access
ILogListener[] listeners = null;
PlatformLogWriter writer;
synchronized (logListeners) {
writer = logWriter;
if (writer == null) {
if (logListeners.isEmpty()) {
queuedMessages.add(status);
return;
}
listeners = logListeners.toArray(new ILogListener[logListeners.size()]);
}
}
if (writer != null) {
writer.logging(status);
return;
}
if (listeners != null) {
for (int i = 0; i < listeners.length; i++) {
try {
listeners[i].logging(status, IRuntimeConstants.PI_RUNTIME);
} catch (Exception | LinkageError e) {
handleException(e);
}
}
}
}
private static void handleException(Throwable e) {
if (!(e instanceof OperationCanceledException)) {
// Got a error while logging. Don't try to log again, just put it into stderr
e.printStackTrace();
}
}
/**
* Helps determine if the logging mechanism is ready for logging.
* @return true the logging mechanism is ready for logging.
*/
public static boolean isEmpty() {
synchronized (logListeners) {
return (logListeners.isEmpty()) && (logWriter == null);
}
}
/**
* Determines if there are any listeners
* @return true if there is at least one listener.
*/
public static boolean hasListeners() {
synchronized (logListeners) {
return (!logListeners.isEmpty());
}
}
private static void emptyQueuedMessages() {
IStatus[] queued;
synchronized (logListeners) {
if (queuedMessages.isEmpty())
return;
queued = queuedMessages.toArray(new IStatus[queuedMessages.size()]);
queuedMessages.clear();
}
for (int i = 0; i < queued.length; i++) {
log(queued[i]);
}
}
static void logToListeners(IStatus status) {
// create array to avoid concurrent access
ILogListener[] listeners;
synchronized (logListeners) {
listeners = logListeners.toArray(new ILogListener[logListeners.size()]);
}
for (int i = 0; i < listeners.length; i++) {
try {
listeners[i].logging(status, IRuntimeConstants.PI_RUNTIME);
} catch (Exception | LinkageError e) {
handleException(e);
}
}
}
}
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