zhaijack commented on a change in pull request #521: Issue 520: Add more http endpoint URL: https://github.com/apache/bookkeeper/pull/521#discussion_r143322959
########## File path: bookkeeper-server/src/main/java/org/apache/bookkeeper/http/ListLedgerService.java ########## @@ -0,0 +1,177 @@ +/** + * + * 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.bookkeeper.http; + +import static com.google.common.base.Charsets.UTF_8; + +import com.google.common.base.Preconditions; +import com.google.common.collect.Lists; +import com.google.common.collect.Maps; +import com.google.common.util.concurrent.AbstractFuture; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import org.apache.bookkeeper.client.BKException; +import org.apache.bookkeeper.client.LedgerMetadata; +import org.apache.bookkeeper.conf.ServerConfiguration; +import org.apache.bookkeeper.http.service.HttpEndpointService; +import org.apache.bookkeeper.http.service.HttpServiceRequest; +import org.apache.bookkeeper.http.service.HttpServiceResponse; +import org.apache.bookkeeper.meta.LedgerManager; +import org.apache.bookkeeper.meta.LedgerManagerFactory; +import org.apache.bookkeeper.proto.BookkeeperInternalCallbacks; +import org.apache.bookkeeper.util.JsonUtil; +import org.apache.bookkeeper.zookeeper.ZooKeeperClient; +import org.apache.zookeeper.ZooKeeper; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * HttpEndpointService that handle Bookkeeper Configuration related http request. + */ +public class ListLedgerService implements HttpEndpointService { + + static final Logger LOG = LoggerFactory.getLogger(ListLedgerService.class); + + protected ServerConfiguration conf; + + public ListLedgerService(ServerConfiguration conf) { + Preconditions.checkNotNull(conf); + this.conf = conf; + } + + // Number of LedgerMetadata contains in each page + static final int LIST_LEDGER_BATCH_SIZE = 100; + + public static class ReadLedgerMetadataCallback extends AbstractFuture<LedgerMetadata> + implements BookkeeperInternalCallbacks.GenericCallback<LedgerMetadata> { + final long ledgerId; + + ReadLedgerMetadataCallback(long ledgerId) { + this.ledgerId = ledgerId; + } + + long getLedgerId() { + return ledgerId; + } + + public void operationComplete(int rc, LedgerMetadata result) { + if (rc != 0) { + setException(BKException.create(rc)); + } else { + set(result); + } + } + } + static void keepLedgerMetadata(ReadLedgerMetadataCallback cb, LinkedHashMap<String, String> output) throws Exception { + LedgerMetadata md = cb.get(); + output.put(Long.valueOf(cb.getLedgerId()).toString(), new String(md.serialize(), UTF_8)); + } + + @Override + public HttpServiceResponse handle(HttpServiceRequest request) throws Exception { + HttpServiceResponse response = new HttpServiceResponse(); + // GET + // parameter could be like: print_metadata=true&page=PageIndex + if (HttpServer.Method.GET == request.getMethod()) { + Map<String, String> params = request.getParams(); + // default not print metadata + boolean printMeta = (params != null) && + params.containsKey("print_metadata") && + params.get("print_metadata").equals("true"); + + // Page index should start from 1; + int pageIndex = (printMeta && params.containsKey("page")) ? + Integer.parseInt(params.get("page")) : + -1; + + ZooKeeper zk = ZooKeeperClient.newBuilder() + .connectString(conf.getZkServers()) + .sessionTimeoutMs(conf.getZkTimeout()) + .build(); + LedgerManagerFactory mFactory = LedgerManagerFactory.newLedgerManagerFactory(conf, zk); + LedgerManager manager = mFactory.newLedgerManager(); + LedgerManager.LedgerRangeIterator iter = manager.getLedgerRanges(); + + // output <ledgerId: ledgerMetadata> + LinkedHashMap<String, String> output = Maps.newLinkedHashMap(); + // futures for readLedgerMetadata for each page. + List<ReadLedgerMetadataCallback> futures = Lists.newArrayListWithExpectedSize(LIST_LEDGER_BATCH_SIZE); + + if (printMeta) { + int ledgerIndex = 0; + + // start and end ledger index for wanted page. + int startLedgerIndex = 0; + int endLedgerIndex = 0; + if(pageIndex > 0) { + startLedgerIndex = (pageIndex - 1) * LIST_LEDGER_BATCH_SIZE; + endLedgerIndex = startLedgerIndex + LIST_LEDGER_BATCH_SIZE - 1; + } + + // get metadata + while (iter.hasNext()) { + LedgerManager.LedgerRange r = iter.next(); Review comment: Thanks, opened issue #542 for tracking it. and would like to keep current changes, then later we will only need add needed change. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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