| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.solr.metrics.rrd; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.lang.invoke.MethodHandles; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.locks.ReentrantLock; |
| |
| import org.rrd4j.core.RrdByteArrayBackend; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * @deprecated this functionality will be removed in Solr 9.0 |
| */ |
| @Deprecated |
| public class SolrRrdBackend extends RrdByteArrayBackend implements Closeable { |
| private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); |
| |
| private final SolrRrdBackendFactory factory; |
| private final boolean readOnly; |
| private final ReentrantLock lock = new ReentrantLock(); |
| private volatile boolean dirty = false; |
| private volatile boolean closed = false; |
| private volatile long lastModifiedTime; |
| |
| public static final class SyncData { |
| public byte[] data; |
| public long timestamp; |
| |
| public SyncData(byte[] data, long timestamp) { |
| this.data = data; |
| this.timestamp = timestamp; |
| } |
| } |
| |
| public SolrRrdBackend(String path, boolean readOnly, SolrRrdBackendFactory factory) { |
| super(path); |
| this.factory = factory; |
| this.lastModifiedTime = TimeUnit.MILLISECONDS.convert(factory.getTimeSource().getEpochTimeNs(), TimeUnit.NANOSECONDS); |
| try { |
| SyncData syncData = factory.getData(path); |
| if (syncData != null) { |
| setBuffer(syncData.data); |
| this.lastModifiedTime = syncData.timestamp; |
| } |
| } catch (IOException e) { |
| log.warn("Exception retrieving data from {}, store will be readOnly", path, e); |
| readOnly = true; |
| } |
| this.readOnly = readOnly; |
| } |
| |
| /** |
| * Open an unregistered (throwaway) read-only clone of another backend. |
| * @param other other backend |
| */ |
| public SolrRrdBackend(SolrRrdBackend other) { |
| super(other.getPath()); |
| readOnly = true; |
| factory = null; |
| this.lastModifiedTime = other.lastModifiedTime; |
| byte[] otherBuffer = other.getBuffer(); |
| byte[] newBuffer = new byte[otherBuffer.length]; |
| System.arraycopy(otherBuffer, 0, newBuffer, 0, otherBuffer.length); |
| super.setBuffer(newBuffer); |
| } |
| |
| public boolean isReadOnly() { |
| return readOnly; |
| } |
| |
| public long getLastModifiedTime() { |
| return lastModifiedTime; |
| } |
| |
| private void markDirty() { |
| lastModifiedTime = TimeUnit.MILLISECONDS.convert(factory.getTimeSource().getEpochTimeNs(), TimeUnit.NANOSECONDS); |
| dirty = true; |
| } |
| |
| @Override |
| protected void write(long offset, byte[] bytes) throws IOException { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.write(offset, bytes); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| protected void writeShort(long offset, short value) throws IOException { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.writeShort(offset, value); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| protected void writeInt(long offset, int value) throws IOException { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.writeInt(offset, value); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| protected void writeLong(long offset, long value) throws IOException { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.writeLong(offset, value); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| protected void writeDouble(long offset, double value) throws IOException { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.writeDouble(offset, value); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| protected void writeDouble(long offset, double value, int count) throws IOException { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.writeDouble(offset, value, count); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| protected void writeDouble(long offset, double[] values) throws IOException { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.writeDouble(offset, values); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| protected void writeString(long offset, String value, int length) throws IOException { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.writeString(offset, value, length); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| protected boolean isDirty() { |
| return dirty; |
| } |
| |
| @Override |
| protected void setBuffer(byte[] buffer) { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.setBuffer(buffer); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| protected void setLength(long length) throws IOException { |
| if (readOnly || closed) { |
| return; |
| } |
| lock.lock(); |
| try { |
| super.setLength(length); |
| markDirty(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| public SyncData getSyncDataAndMarkClean() { |
| if (readOnly || closed) { |
| return null; |
| } |
| if (!dirty) { |
| return null; |
| } |
| // hold a lock to block writes so that we get consistent data |
| lock.lock(); |
| try { |
| byte[] oldBuffer = getBuffer(); |
| byte[] bufferCopy = new byte[oldBuffer.length]; |
| System.arraycopy(oldBuffer, 0, bufferCopy, 0, oldBuffer.length); |
| return new SyncData(bufferCopy, lastModifiedTime); |
| } finally { |
| // reset the dirty flag |
| dirty = false; |
| lock.unlock(); |
| } |
| } |
| |
| @Override |
| public void close() throws IOException { |
| super.close(); |
| closed = true; |
| if (factory != null) { |
| // unregister myself from the factory |
| factory.unregisterBackend(getPath()); |
| } |
| // close |
| } |
| } |