com.streamsets.datacollector.execution.runner.cluster.SlaveCallbackManager.java Source code

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Here is the source code for com.streamsets.datacollector.execution.runner.cluster.SlaveCallbackManager.java

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/**
 * Copyright 2015 StreamSets Inc.
 *
 * Licensed under 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 com.streamsets.datacollector.execution.runner.cluster;

import com.google.common.base.Strings;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.streamsets.datacollector.callback.CallbackInfo;
import com.streamsets.datacollector.main.RuntimeInfo;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;

public class SlaveCallbackManager {

    private static final Logger LOG = LoggerFactory.getLogger(SlaveCallbackManager.class);

    private final ReentrantLock callbackCacheLock;
    private final Cache<String, CallbackInfo> slaveCallbackList;
    private String clusterToken;

    public SlaveCallbackManager() {
        this.callbackCacheLock = new ReentrantLock();
        this.slaveCallbackList = CacheBuilder.newBuilder().expireAfterWrite(1, TimeUnit.MINUTES).build();
    }

    public Collection<CallbackInfo> getSlaveCallbackList() {
        List<CallbackInfo> callbackInfoSet;
        callbackCacheLock.lock();
        try {
            callbackInfoSet = new ArrayList<>(slaveCallbackList.asMap().values());
        } finally {
            callbackCacheLock.unlock();
        }
        return callbackInfoSet;
    }

    public void updateSlaveCallbackInfo(CallbackInfo callbackInfo) {
        String sdcToken = Strings.nullToEmpty(this.clusterToken);
        if (sdcToken.equals(callbackInfo.getSdcClusterToken())
                && !RuntimeInfo.UNDEF.equals(callbackInfo.getSdcURL())) {
            callbackCacheLock.lock();
            try {
                slaveCallbackList.put(callbackInfo.getSdcURL(), callbackInfo);
            } finally {
                callbackCacheLock.unlock();
            }
        } else {
            LOG.warn("SDC Cluster token not matched");
        }
    }

    public void clearSlaveList() {
        callbackCacheLock.lock();
        try {
            slaveCallbackList.invalidateAll();
        } finally {
            callbackCacheLock.unlock();
        }
    }

    public void setClusterToken(String clusterToken) {
        this.clusterToken = clusterToken;
    }

    public String getClusterToken() {
        return clusterToken;
    }
}